/usr/lib/x86_64-linux-gnu/libnetsnmpagent.so is in libsnmp-dev 5.7.2.1+dfsg-1+deb8u1+b1.
This file is owned by root:root, with mode 0o777.
It is a symlink to /usr/lib/x86_64-linux-gnu/libnetsnmpagent.so.30.0.2
/usr/lib/x86_64-linux-gnu/libnetsnmpagent.so.30.0.2