/usr/share/doc/cyrus-murder/changelog.Debian.gz is in cyrus-murder 2.4.18-3.
This file is owned by root:root, with mode 0o777.
It is a symlink to /usr/share/doc/cyrus-murder/../cyrus-common/changelog.Debian.gz
/usr/share/doc/cyrus-murder/../cyrus-common/changelog.Debian.gz