“Azarkant“, sci-fi short animated film, Andrey Klimov, 2013, Russia

Source - In the future, a team of astronauts are sent on a ten year journey to a distant planet to find new life. On their way, they encounter a large, abandoned spaceship that is drifting in the orbit of a mysterious planet. They board the ship with anticipation of the great discoveries to uncover inside. However, they do not know what terrible secret this spacecraft keeps -- a nightmarish threat which is far bigger and scarier than anything they could have imagined.