Malicious PDF — malware analysis report

Static analysis result for SHA-256 8a31f852891e2e7c…

MALICIOUS

PDF

33.8 KB Authoring application: Karbon
MD5: 9bbb10f325778efb04e39d218ff9c588 SHA-1: 358d5f56288246752b22cc04d83e391442068c39 SHA-256: 8a31f852891e2e7c845ac515f4341468fe1da985b4d6e367c7264594c02cfd06
150 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF contains a large number of embedded URLs pointing to other PDF files, a technique commonly used for SEO poisoning and phishing. The ClamAV detection and ML classifier strongly indicate malicious intent. The document body, though heavily obfuscated, contains references to 'GMC yukon 2013 manual' and lists several URLs, suggesting a lure to download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

Heuristics 3

  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • ClamAV: Pdf.Phishing.TtraffRobotInstall-7605656-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.TtraffRobotInstall-7605656-0
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL http://nakomagraeagle.com/uploads/1/3/0/3/130313069/0704d4c4237.pdf
    • http://midwestpsn.org/uploads/1/3/0/6/130620781/vefemure-motodubedutu-rologevij.pdf
    • http://petereliason.net/uploads/1/3/0/6/130620337/4836210.pdf
    • http://jozixek.tamitatami.pro/uploads/2020/01/28/89442650602a12b.pdf
    • http://friendsofforbsie.com/uploads/1/3/0/4/130490808/babeditiparixaze.pdf
    • http://arielleschiano.com/uploads/1/3/0/6/130620955/tekizonuberutanu.pdf
    • http://zambiasafarihunting.com/uploads/1/3/0/4/130476276/130476276.html#gmc+yukon+2013+manual

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000010fc.bin
c33196ab6344f6f6d8276116c850a2138618dcf2d02eabfb75bc4afd7e2b6558		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10FC 8636 bytes

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