From the above we see that the drive we just pluGged into the system is “sda” so our path and partition is “/dev/sda1”
The following command will run hashcat against “/dev/sda1”, change if the encrypted partition is different. Mode is to brute force every 8 numeric character combination. Refer to the following link to learn more about mask attacks. https://hashcat.net/wiki/doku.php?id=mask_attack
Note: You should be able to dump the header and work off of that as well.
sudo hashcat -a 3 -m 14600 /dev/sda1 ?d?d?d?d?d?d?d?d