Malicious PDF — malware analysis report

Static analysis result for SHA-256 50ca5b601063cb91…

MALICIOUS

PDF

36.0 KB Authoring application: LibreOffice Draw
MD5: e76271897b1d31a3ce045c0dde66a2ac SHA-1: 6f79f17b6254b94ec7df22042189f337d9c777a3 SHA-256: 50ca5b601063cb915214bf220005fc12307d083b719aa1c026836045e6967df6
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a large number of external links, identified by the PDF_SEO_LINK_FARM heuristic, pointing to various PDF files hosted on different domains. This suggests a tactic to manipulate search engine results or to distribute malicious content through a link farm. The ML classifier and ClamAV detection further support the malicious nature of this file.

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://cjconcep.art/uploads/1/3/0/3/130323158/wujugopasozi-xoverot-mogegawi.pdf
    • http://lapsonsplace.com/uploads/1/3/0/4/130435972/2056506.pdf
    • http://rampantgames.net/uploads/1/3/0/5/130538937/peparutin.pdf
    • http://kizebe.chezmoidesign.com/uploads/2020/01/28/691b77ea9fa2e.pdf
    • http://noeticpractices.com/uploads/1/3/0/7/130775294/d67c1e13f19f.pdf
    • http://wpdogs.com/uploads/1/3/0/8/130814248/0a731e.pdf
    • http://puertoricoweddingphoto.com/uploads/1/3/0/2/130288412/kolidenorak_zitolewuta_kogofobixavu.pdf
    • http://nuohotel-zh.devsite-1.com/uploads/1/3/0/4/130435685/130435685.html#adjectives+ed+ing+perfect+english

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000011b9.bin
6b675e7b43e4397689adf5bfb9bbb1e98e6a9cd59b089ae5f2b86c7482e92976		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11B9 8340 bytes

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