Malicious PDF — malware analysis report

Static analysis result for SHA-256 cacb2c3d69be707e…

MALICIOUS

PDF

35.5 KB Authoring application: Pdftk
MD5: 0277f7cd1858c63dc50f80dfad895215 SHA-1: d551c1d6f12c6663cc11a4c56ff543c96f25e99e SHA-256: cacb2c3d69be707e281e2ee4ce6619ea3e4d2dfc7b6933d973c28b0a88b947f9
150 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics, including ClamAV and an ML classifier, indicating malicious intent. The PDF_SEO_LINK_FARM heuristic fired, identifying a large number of external links within the document, with the primary domain being worlddoll.ru. These links likely serve as a lure to redirect users to potentially malicious sites. No scripts were extracted from this sample.

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://worlddoll.ru/uploads/2020/01/27/lagedoto.pdf
    • http://wishingpermission.com/uploads/1/3/0/4/130489475/2abe8.pdf
    • http://bakersacresfarm.com/uploads/1/3/0/2/130289239/8ff3258a5d.pdf
    • http://kelliottportfolio.com/uploads/1/3/0/5/130550936/245912.pdf
    • http://clbart.com/uploads/1/3/0/7/130739633/lapagog.pdf
    • http://raleighcommunitydevelopment.com/uploads/1/3/0/2/130289583/6944323.pdf
    • http://lollye.com/uploads/1/3/0/5/130539408/luvasazu_bowajakawofag.pdf
    • http://thesingbabysingshow.com/uploads/1/3/0/5/130589334/130589334.html#cylinder+number+of+faces+edges+and+vertices

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000010e4.bin
3ef3523b30a8404117117b9a735d27817e035415ab85d0d97c9bb88ef9d9a1a5		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10E4 7196 bytes

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