Malicious PDF — malware analysis report

Static analysis result for SHA-256 81d211cb263e2aff…

MALICIOUS

PDF

131.6 KB Authoring application: Smallpdf Desktop First seen: 2020-09-24
MD5: de8f04dd81aed37bc3fba447014c935b SHA-1: e67db084e5870732cb4e8824339fcaadef5451a7 SHA-256: 81d211cb263e2aff196ae1e0c36c5a8af17a72a55aaeddc3d26dc4b5277091c0
152 Risk Score

Malware Insights

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

The PDF contains a significant number of external links, identified by the PDF_SEO_LINK_FARM heuristic, pointing to various PDF and HTML files. The ML classifier and ClamAV also flagged this file as malicious, specifically as a phishing or traffic redirection tool. The embedded URLs are the primary indicators of compromise, suggesting the document's purpose is to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9616

Heuristics 3

  • ClamAV: Pdf.Phishing.TtraffRobotInstall-7605656-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.TtraffRobotInstall-7605656-0
  • 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.
  • 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://ashlandeducationfund.org/uploads/1/3/0/5/130551310/ee9d464ce.pdf In PDF document text
    • http://wetawo.5525.su/uploads/2020/01/29/virufopigexofevugexu.pdfIn PDF document text
    • http://catv47.com/uploads/1/3/0/5/130588173/bixagak.pdfIn PDF document text
    • http://midcitycarriages.org/uploads/1/3/0/7/130775784/130775784.html#auto+mechanics+dictionary+pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://fedoraproject.org/wiki/Licensing/LiberationFontLicenseIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000010fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FA 9304 bytes
SHA-256: 94be44f818058c73882f468e5a9bc2687db96b9da26763fce054d6a184c38617
font_01_sfnt_off00009680.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9680 2600 bytes
SHA-256: 41d5c9cb4d60b7530e3cfd93a78efd430fe179aa57a8296e74fb8a971da4b0ee
font_02_sfnt_off000135aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x135AA 16204 bytes
SHA-256: f31c439e28d0137206b91a151f21343900f846ed9ff070250fbe82eb1cc7da1d

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