Malicious PDF — malware analysis report

Static analysis result for SHA-256 0b0f9606781567de…

MALICIOUS

PDF

40.9 KB Authoring application: Poppler-utils
MD5: 3ee7ae342935ea6ec63faf2cfc861ff9 SHA-1: 3880909678eee73e6aec43fc0ef754b0961619f9 SHA-256: 0b0f9606781567de824f58c4709dd709de3015d7d5d1788fe42f969a23148fe5
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a large number of embedded external links, identified by the PDF_SEO_LINK_FARM heuristic, pointing to various domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution. Although no scripts were explicitly extracted, the nature of the link farm suggests a mechanism for redirecting users to malicious content or further stages of an attack.

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://saltyrein.com/uploads/1/3/0/6/130621473/7062715.pdf
    • http://suportland.net/uploads/1/3/0/4/130435960/xavixabidal.pdf
    • http://brittany-paris.net/uploads/1/3/0/2/130288410/2063093.pdf
    • http://ecpn.su/uploads/2020/01/29/rurafakigef.pdf
    • http://satromforhouse.com/uploads/1/3/0/6/130620882/kibopagupuw.pdf
    • http://sauerlandhypotheek.nl/uploads/1/3/0/5/130539516/130539516.html#beginning+visual+basic+2015+by+bryan
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://fedoraproject.org/wiki/Licensing/LiberationFontLicense

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000010a5.bin
cd979099ab0b3be44482fbe181a6f4a51d04ca876200879fdeaa47cbbea97bf6		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10A5 8584 bytes
font_01_sfnt_off00006545.bin
bb66d78edca8aa75a8db461931e44ad6eab12e4cd439df836d92d13c6ef6c22d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6545 2668 bytes

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