/usr/lib/x86_64-linux-gnu/libproxychains.so is in libproxychains-dev 3.1-6.
This file is owned by root:root, with mode 0o777.
It is a symlink to /usr/lib/x86_64-linux-gnu/libproxychains.so.3.0.0
/usr/lib/x86_64-linux-gnu/libproxychains.so.3.0.0