/usr/lib/x86_64-linux-gnu/libssh.so is in libssh-dev 0.6.1-0ubuntu3.5.
This file is owned by root:root, with mode 0o777.
It is a symlink to /usr/lib/x86_64-linux-gnu/libssh.so.4
/usr/lib/x86_64-linux-gnu/libssh.so.4