If a "buyer" or "seller" sends you a file named avito.zip (or similar) via WhatsApp or Telegram, it is almost certainly or a phishing tool designed to steal your credentials.
Usually an XML or CSV file containing product data (titles, descriptions, prices) and a folder containing product images. How to create it: avito.zip
Put all product photos into a single folder. If a "buyer" or "seller" sends you a file named avito
Avito explicitly warns never to click links or open attachments sent outside the official Avito messenger. Genuine Avito Delivery processes are handled entirely within the app/website and do not require downloading external files. " "delivery labels
Scammers often claim the ZIP file contains "payment confirmation," "delivery labels," or "additional product photos".