Malicious PDF — malware analysis report

Static analysis result for SHA-256 bf8c72929026b392…

MALICIOUS

PDF

77.1 KB Created: 2021-03-18 13:31:43 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 83a3872184adc4aa9f7102de40d573d6 SHA-1: def9fc99138525aea6863aad24063550fa04a2b7 SHA-256: bf8c72929026b392698bec443c651973dd66d6623eabd462243f9a2ed3a6a118
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

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://leonvi.ru/strik?utm_term=what+is+the+best+telephone+answering+machine PDF link annotation
    • https://wenigekotowas.weebly.com/uploads/1/3/4/5/134576851/fe1f7f77.pdfIn PDF document text
    • https://fepepifufom.weebly.com/uploads/1/3/1/8/131872298/39a6b24fffdc95.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4385648/normal_6027a49fa48d8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4470968/normal_5fdb7d20daa08.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450418/normal_6038d5e8b5b61.pdfIn PDF document text
    • http://missunik.space/56849203479k5hgr.pdfIn PDF document text
    • http://fitdieta.com/bootstrap_templates_portfolio_free3rbdu.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://darelarara.epizy.com/restraining_order_ohio_form.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9ac582d2-5927-4bd8-b46e-b9f48808e3b1/ditamefuj.pdfIn PDF document text
    • https://s3.amazonaws.com/pokorevalaxex/mystic_messenger_designer_email_answers.pdfIn PDF document text
    • https://s3.amazonaws.com/rizezobabub/geometric_distribution_formula.pdfIn PDF document text
    • https://s3.amazonaws.com/kugelilizibuwum/wiponewimazidote.pdfIn PDF document text
    • http://wabupotobexuxu.epizy.com/buckeye_health_plan_provider_appeal_form.pdfIn PDF document text
    • http://buweweja.epizy.com/jusokemomifelugogev.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0ff96047-dbb0-4062-ba45-d7206abcd0ab/56495228782.pdfIn PDF document text
    • https://s3.amazonaws.com/metubevozisul/natakam_telugu_movie_jio_rockers.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7547fa4f-e256-447f-aa00-d45032382071/fakupobexelewubik.pdfIn PDF document text
    • https://s3.amazonaws.com/bokofapig/17935728456.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1302ed82-ef04-460d-88f4-f9844319264d/what_are_the_two_main_categories_of_printers.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_off0000ef2a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF2A 5592 bytes
SHA-256: 53fd730944310ceed5aeb02190d36096eaf9649c7de256debc16a205faf1d57d
font_01_sfnt_off0001021f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1021F 10816 bytes
SHA-256: 1c857f823b48810f6df54e5a240e04532ba4581238177c984da4f28e0e390c61

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