Malicious PDF — malware analysis report

Static analysis result for SHA-256 c13cc9342303eeec…

MALICIOUS

PDF

67.5 KB Created: 2020-11-24 23:11:44 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-31
MD5: e60d8b2eff97bea9187d144bb6937cf1 SHA-1: d249de1e1c6fc559c1d1bbd5efa27c52f8f92f37 SHA-256: c13cc9342303eeec72200c0a200dd76f4c9f60647bc3eaf98baabadcbf6bd51a
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many pointing to Weebly hosted PDFs, suggesting a link farm or redirection mechanism for malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent. Although no scripts were explicitly extracted, the PDF structure and numerous external links are indicative of a phishing or malware distribution attempt, likely leveraging embedded JavaScript for redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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.
  • 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://trafftec.ru/123?utm_term=legislative+branch+test+study+guide PDF link annotation
    • https://vejejalerejoji.weebly.com/uploads/1/3/4/6/134600164/ca008b86317.pdfIn PDF document text
    • https://guvefivilemu.weebly.com/uploads/1/3/4/3/134397682/mafoxozozofomiw.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384825/normal_5fa00f003f1b6.pdfIn PDF document text
    • https://xexezakofiwojuv.weebly.com/uploads/1/3/4/3/134372147/volixipaz.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4482216/normal_5fb5b44be65f1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4378604/normal_5f9f0b1a0ab57.pdfIn PDF document text
    • https://dusexitope.weebly.com/uploads/1/3/4/6/134646398/baziziroguvog-teronekox-lifuxi-najaloka.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383915/normal_5f9776ae9ad61.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/04c75757-a508-418a-abcd-5c0c7bc4ea16/9576350997.pdfIn PDF document text
    • https://s3.amazonaws.com/lixuzo/61951539572.pdfIn PDF document text
    • https://s3.amazonaws.com/tejuvonixag/manual_j_online_for_free.pdfIn PDF document text
    • https://s3.amazonaws.com/xufoxorog/46156309717.pdfIn PDF document text
    • https://s3.amazonaws.com/zesixefe/subegejefex.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cab1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCAB1 5444 bytes
SHA-256: 13275631e5711e2f46ee52a587bc6de131dfa19c4011f3f38f245c697ee9ba40
font_01_sfnt_off0000dd3a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD3A 10640 bytes
SHA-256: 94454fa39b171fc5badfe9f7cbb871120968f7c07b9948cff58816e2a1b2e6bb

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