  We analyze Near-Infrared Integral Field Spectrograph (NIFS) observations of
the type-2 quasar (QSO2) SDSS J094521.33+173753.2 to investigate its warm
molecular and ionized gas kinematics. This QSO2 has a bolometric luminosity of
10$^{45.7}$ erg s$^{-1}$ and a redshift of z = 0.128. The K-band spectra
provided by NIFS cover a range of 1.99-2.40 $\mu$m where low-ionization
(Pa$\alpha$ and Br$\delta$), high ionization ([S XI]$\lambda$1.920 $\mu$m and
[Si~VI]$\lambda$1.963 $\mu$m) and warm molecular lines (from H$_2$ 1-0S(5) to
1-0S(1)) are detected, allowing us to study the multi-phase gas kinematics. Our
analysis reveals gas in ordinary rotation in all the emission lines detected
and also outflowing gas in the case of the low- and high-ionization emission
lines. In the case of the nuclear spectrum, which corresponds to a circular
aperture of 0.3\arcsec~(686 pc) in diameter, the warm molecular lines can be
characterized using a single Gaussian component of full width at half maximum
(FWHM)= 350-400 km s$^{-1}$, while Pa$\alpha$, Br$\delta$, and [Si~VI] are best
fitted with two blue-shifted Gaussian components of FWHM$\sim$800 and 1700 km
s$^{-1}$, in addition to a narrow component of $\sim$300 km s$^{-1}$. We
interpret the blue-shifted broad components as outflowing gas, which reaches
the highest velocities, of up to $-$840 km s$^{-1}$, in the south-east
direction (PA$\sim$125$^{\circ}$), extending up to a distance of $\sim$3.4 kpc
from the nucleus. The ionized outflow has a maximum mass outflow rate of
$\dot{\text{{M}}}_{\text{{out, max}}}$=42-51 M$_\odot$ yr$^{-1}$, and its
kinetic power represents 0.1$\%$ of the quasar bolometric luminosity.
