/usr/mips64-linux-gnuabi64/bin/ar is in binutils-mips64-linux-gnuabi64 2.28-5.
This file is owned by root:root, with mode 0o777.
It is a symlink to /usr/mips64-linux-gnuabi64/bin/../../bin/mips64-linux-gnuabi64-ar
/usr/mips64-linux-gnuabi64/bin/../../bin/mips64-linux-gnuabi64-ar