/usr/lib/libnetsnmphelpers.so is in libsnmp-dev 5.4.3~dfsg-2.4ubuntu1.
This file is owned by root:root, with mode 0o777.
It is a symlink to /usr/lib/libnetsnmphelpers.so.15.1.2
/usr/lib/libnetsnmphelpers.so.15.1.2