Malicious PDF — malware analysis report

Static analysis result for SHA-256 1f4f31d65e238002…

MALICIOUS

PDF

102.1 KB Created: 2020-12-16 21:51:44 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2b68f700772dd9db96e406256353ff19 SHA-1: 1f68f5bcec481b86b43dd9916e4c4acc9ebd6afe SHA-256: 1f4f31d65e23800203f78c65ba4b8bf217ecf038005974239ef2eb3065b6ff88
156 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, suggesting a link farm or phishing campaign. The primary external URL, 'https://trafffi.ru/123?utm_term=armadillo+lizard+for+sale+uk', is likely a lure. The ML classifier and ClamAV detection strongly indicate malicious intent, classifying it as a phishing trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • 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.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • 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 https://trafffi.ru/123?utm_term=armadillo+lizard+for+sale+uk
    • https://cdn-cms.f-static.net/uploads/4365613/normal_5f8f59515f08b.pdf
    • https://static.s123-cdn-static.com/uploads/4467589/normal_5fc673b64b85e.pdf
    • https://cdn-cms.f-static.net/uploads/4375694/normal_5fc36835e52b9.pdf
    • https://cdn-cms.f-static.net/uploads/4380674/normal_5f9f3853dcbb5.pdf
    • https://cdn-cms.f-static.net/uploads/4458623/normal_5fb5f168c2fc7.pdf
    • https://sedonefuwetupo.weebly.com/uploads/1/3/4/6/134669082/3768059.pdf
    • https://cdn-cms.f-static.net/uploads/4483587/normal_5fd8b8b87dde2.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://static1.squarespace.com/static/5fc57f93df132613bbdcadde/t/5fce319dfe657040d5bc94ac/1607348638075/74250483024.pdf
    • https://static1.squarespace.com/static/5fbce344be7cfc36344e8aaf/t/5fbdee0c3570fb44d1c7ef75/1606282765071/eastland_career_center_phone_number.pdf
    • https://static1.squarespace.com/static/5fcf68723d7784041093dffd/t/5fd6f127d654060362dd1e6b/1607921962156/field_work_report_writing_samples.pdf
    • https://uploads.strikinglycdn.com/files/d2663e5d-4b25-414a-b201-146cf6690361/64862686961.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000154b9.bin
1433bf8675875a8d57bfc5c5dd7c9008b34c654288334a9901b19e048cc96806
pdf-font-stream PDF embedded font (sfnt) at offset 0x154B9 5156 bytes
font_01_sfnt_off00016633.bin
68ce5a01e825fad83a80da5a9b562dddcd66dfe6d676933c802854fd44a5f550
pdf-font-stream PDF embedded font (sfnt) at offset 0x16633 11092 bytes