Malicious PDF — malware analysis report

Static analysis result for SHA-256 6c1ad23ed821ea96…

MALICIOUS

PDF

66.3 KB Created: 2020-11-13 11:09:08 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-16
MD5: 5c57d12294a65dab9eeaac39e3a188fa SHA-1: 51a38424b0a76f82a462d2d29ea1582c68396f1c SHA-256: 6c1ad23ed821ea9671df871ecbfc5e972e71ff4ee800ef441f81faf6748a9c5c
226 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution T1059.007 JavaScript

This PDF document contains a large number of external links, many pointing to disposable hosting services, suggesting a link farm or phishing operation. The 'SE_BROWSER_INSTALL_LURE' heuristic indicates the document likely prompts the user to install a browser extension or update. While no scripts were extracted, the ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 7

  • 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.
  • Browser extension / update installation lure high SE_BROWSER_INSTALL_LURE
    Document tells the user to install a browser extension, plugin, viewer, or browser update to view content — a common social-engineering path for credential theft and malware installation
  • 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://trafffe.ru/123?utm_term=how+to+add+a+video+in+google+slides PDF link annotation
    • https://donikigegetala.weebly.com/uploads/1/3/4/3/134311768/tokeli.pdfIn PDF document text
    • https://lituveso.weebly.com/uploads/1/3/4/3/134362288/falav-getuzalovizava-ralonike-naneseto.pdfIn PDF document text
    • https://vuzevarezevarot.weebly.com/uploads/1/3/0/7/130740461/4ea5f8282d36a85.pdfIn PDF document text
    • https://muxamaxipusitu.weebly.com/uploads/1/3/4/4/134470051/1764347.pdfIn PDF document text
    • https://mufedagejex.weebly.com/uploads/1/3/4/7/134726032/duxujapif_jumepolifi_luzilarumezo_zomiduxevow.pdfIn PDF document text
    • https://mogidudurunupiz.weebly.com/uploads/1/3/2/6/132695636/4254953.pdfIn PDF document text
    • https://bilewazivabo.weebly.com/uploads/1/3/2/8/132816117/7806583.pdfIn PDF document text
    • https://letuwolisabir.weebly.com/uploads/1/3/4/6/134602086/godujolad.pdfIn PDF document text
    • https://dixozetazexode.weebly.com/uploads/1/3/4/4/134472526/nunewanez.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366401/normal_5f8715e59c413.pdfIn PDF document text
    • https://firerokuk.weebly.com/uploads/1/3/1/1/131164187/jiwitet.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4378846/normal_5fa719f83363b.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/402de515-5133-4357-bcc1-c2020e94bdb5/bitlife_mod_apk_latest.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9c1b01c7-7815-4ae6-ad3d-9ae6b5a3344e/identifying_thesis_statement_worksheet.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/44ba9888-31a2-4aa8-99a6-90db94f5481e/el_silencio_de_los_inocentes_saga.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_off0000c760.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC760 5008 bytes
SHA-256: acf6b6582c7d0d2329463953c367f145200ba8b6c6972c0ec38d63284a54ad4f
font_01_sfnt_off0000d898.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD898 10472 bytes
SHA-256: 24ea0dfbed1c8d1f108ceb40c8981001e4c985b0bd9afc0413392aabecd65cc9

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