Malicious PDF — malware analysis report

Static analysis result for SHA-256 c96eb340cbdc71ea…

MALICIOUS

PDF

101.9 KB Authoring application: OpenOffice.org
MD5: 302d2e8a01714022c52c35de9b26c32f SHA-1: 87a6719e7d9052f2596c818db67aec83b864f434 SHA-256: c96eb340cbdc71ea4146f5f438fef5c3410b0e1a3e3082bf96b40e98f1a6d072
150 Risk Score

Malware Insights

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

The PDF file contains a large number of embedded URLs pointing to other PDF documents across various domains. This behavior is indicative of a link farm or a distribution mechanism for further malicious content, as suggested by the 'PDF_SEO_LINK_FARM' and 'CLAMAV_DETECTION' heuristics. The ML classifier also strongly flagged this PDF as malicious. No scripts were extracted from this sample, so the primary attack vector appears to be the redirection to external resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9979

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://xavo.g-c-s.cc/uploads/2020/01/29/rusijag_rilapeliped_vimuzuwoje.pdf
    • http://oclacrosse.net/uploads/1/3/0/4/130436152/vamutojas.pdf
    • http://toutusage.com/uploads/2020/01/27/ditur-matetat-visofovukabo.pdf
    • http://beyoutiful.ca/uploads/1/3/0/6/130620893/pupev-rumot-likadalap.pdf
    • http://sarudof.candidaturaomarmolina.com/uploads/2020/01/27/1096467.pdf
    • http://clubmegamixradio.net/uploads/1/3/0/6/130621785/bd18c94b4a6.pdf
    • http://xabiriga.usual-senders.pro/uploads/2020/01/28/7142627.pdf
    • http://satukixa.koyko-mesto.com/uploads/2020/01/28/3bff53dd.pdf
    • http://sweetestdreams.org/uploads/1/3/0/5/130589103/130589103.html#obra+el+cepillo+de+dientes+pdf

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000137a.bin
f00d40f8fcf14db1323a2f6de502b5121ff21756c7873e86b577f01233c49721		 pdf-font-stream PDF embedded font (sfnt) at offset 0x137A 9988 bytes

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