The phrase "a sinister shadow" is correct and usable in written English.
It can be used to describe something that evokes a sense of danger, evil, or foreboding, often in a metaphorical sense.
Example: "As the storm approached, a sinister shadow loomed over the village, casting an eerie pall over the landscape."
Alternatives: "a menacing presence" or "an ominous figure."
The paper announced that the murder had "cast a sinister shadow" over Tokyo's entire female expatriate community.
Wordless, monochrome and shot with a mobile, seasick camera, it's a sinister shadow of those urban silent comedies in which lovable rascals are chased down by police officers.
I discovered Blackwood through an ancient copy of Tales of the Uncanny and Supernatural, which repackaged 22 of his short stories into a chunky volume that still casts a sinister shadow across the stairwell of my house.
The people who fought to remove Richard Serra's "Tilted Arc" from Foley Square — it came down in 1989, after eight years of public protest — said that the arc was "ugly," "brutal," "intrusive," "hostile," "offensive," and "dangerous," and even that it cast a "sinister shadow," but none of them said that it was a bad role model, or was racist, or insulted minorities.
But the first chapter and its outcrops of bitterness have done their damage, casting a sinister shadow over the rest of the book.
I didn't think I resembled Bonnie Parker, as in Bonnie and Clyde, but I must have cast a sinister shadow on that misty September morning.
And history shows that these words that Bill O'Reilly invoked cast a long, sinister shadow.
The Army's national military offensive, Operation Zarb-e-Azb, sought to dismantle the terror outlet that had cast a large and sinister shadow over much of the country since its formation in 2007.
They also sought reassurance after the sinister shadow that saw off Ramón Calderón cast a cloud over Catalunya.
Alberto Fujimori and his sinister shadow, Vladimiro Lenin Montesinos, and Fujimori's bizarre resignation following a bribery scandal that enveloped his increasingly autocratic administration.
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