Even purchased dirt cheap at one star, this car makes a horrible profit. And the Maluch isn't really faster to rebuild than the others. In fact there are faster rebuilds, unless you are a completionist or want one for your collection, I say don't waste your time and energy on this car. You can make more money - a lot more - in the same amount of time doing oil changes and brake jobs for clients.
Purchase Price: $2,297
Repair Cost: $5,294 (+/-)
Sale Price: $7,809
Profit: $218 (+/-)
As you can see, the Maluch is a terrible car to rebuild for profit in Car Mechanic Simulator 2015. Only bother with this one for the sake of completion or if you are building a complete collection of vehicles.
Rebuilding vehicles for profit in Car Mechanic Simulator 2015 is by far the most profitable activity in the game, assuming that you're picking the right vehicles. Of course a solid supply of spare parts helps too. Here are a few links to additional information that can help you get started in the Car Rebuilding side of the game. This will help you improve your overall game experience:
Rebuilding Guide with Cost vs Profit for all Vehicles in Car Mechanic Simulator 2015
The Auctions Center - The place you buy vehicles
Complete Series of Vehicle Rebuilds for Car Mechanic Simulator 2015
Tunerz Paradize - The place to get special parts to trick out your rides