Malicious PDF — malware analysis report

Static analysis result for SHA-256 089a1e6233541004…

MALICIOUS

PDF

98.0 KB Created: 2021-06-02 09:20:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-10
MD5: 9138278a83c0404bc8db41f9079d26f8 SHA-1: 4571858eca978fd9b263b9bc0702063f1a221659 SHA-256: 089a1e62335410048da60d5e112b7d5ea8849bb5a86ac7eade1f438bf658f5ec
186 Risk Score

Malware Insights

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

The PDF file contains numerous external links, identified as a link farm, with one prominent URL pointing to 'https://huntic.ru/pbw?utm_term=el+fedon+platon+resumen'. Heuristics indicate this is a phishing attempt and a link farm on disposable hosting. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or SEO spam.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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://huntic.ru/pbw?utm_term=el+fedon+platon+resumen PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4471692/normal_60437dd2a0775.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4462341/normal_5ff855cfd84d8.pdfIn PDF document text
    • https://static.s123-cdn-static-d.com/uploads/4369626/normal_60b53f8f3202a.pdfIn PDF document text
    • https://xadibepewi.weebly.com/uploads/1/3/4/4/134447443/ccfbd1275a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4445340/normal_604de4e485145.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4484632/normal_5fd36c5d375b1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4411493/normal_6028667ec7e6c.pdfIn PDF document text
    • https://loxutagunepolu.weebly.com/uploads/1/3/4/7/134763456/fumeguximo_bujod.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4487658/normal_6010a8421e8c5.pdfIn PDF document text
    • https://zagumukukawikam.weebly.com/uploads/1/3/4/6/134608037/177b315a28.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://gabumur.pbworks.com/w/file/fetch/144486048/frases_para_boletas_2021.pdfIn PDF document text
    • http://jizakatum.pbworks.com/w/file/fetch/144488778/3d_printed_house_builders.pdfIn PDF document text
    • http://fepewuwakow.pbworks.com/w/file/fetch/144483816/36667777062.pdfIn PDF document text
    • http://nerobedevu.pbworks.com/w/file/fetch/144481377/vepogegonorasefutise.pdfIn PDF document text
    • http://dejimebez.pbworks.com/f/repapuvobigajifatexulot.pdfIn PDF document text
    • http://zudilazo.pbworks.com/f/machine__laver_far_9kg_notice.pdfIn PDF document text
    • http://papoxuva.pbworks.com/f/gawileridipuneva.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_off000138ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x138ED 5144 bytes
SHA-256: 7ccc67b5e4a2011ecc139845f6b5eeb7b7807da8e69105e1616b0fa33940acd2
font_01_sfnt_off00014a5d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14A5D 15464 bytes
SHA-256: c9119f2a8a2ea3741ce6bc52e4f71cedda3e4fc3e68dc866629e57048d4eed9f

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