/usr/lib/x86_64-linux-gnu/libev.so.4 is in libev4 1:4.22-1+b1.
This file is owned by root:root, with mode 0o777.
It is a symlink to /usr/lib/x86_64-linux-gnu/libev.so.4.0.0
/usr/lib/x86_64-linux-gnu/libev.so.4.0.0