The intermolecular forces of attraction present between ${\mathrm{NH}}_3$ and ${\mathrm{C}}_6{\mathrm{H}}_6$ are

${\mathrm{C}}_6{\mathrm{H}}_6$ is by nature a non-polar molecule. On the other hand, ${\mathrm{NH}}_3$ is a polar molecule.

So, when the polar ${\mathrm{NH}}_3$ molecule comes closer to the non-polar ${\mathrm{C}}_6{\mathrm{H}}_6$ molecule, it induces a dipole on the latter by disturbing the electron cloud.

When a polar molecule disturbs the electron cloud of a non-polar species, a dipole-induced dipole form.