Malicious PDF — malware analysis report

Static analysis result for SHA-256 18144744af6badf1…

MALICIOUS

PDF

82.9 KB Created: 2021-03-10 05:43:39 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: 777074cb364d7d6d2192ce63d9e6cbf3 SHA-1: 043f94f9eefae9b13a63fbee5a11a8ad98693f29 SHA-256: 18144744af6badf1345704c27b3b7362a53fd63ff8194651604539ad07d56936
186 Risk Score

Malware Insights

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

The PDF file contains numerous external links, many of which are part of a link farm hosted on disposable domains, indicating a likely SEO manipulation or phishing attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URLs point towards a malicious document designed to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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.
  • 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://leonvi.ru/strik?utm_term=ethiopian+bible+88+books+in+english PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4467915/normal_603942c4ebcdf.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383912/normal_6027e80ae52f5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4456393/normal_60253f57aafe2.pdfIn PDF document text
    • http://lnstagram-badge-verification.com/win_10_to_usb_drive8m4eq.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4455208/normal_6010e1c6d8e56.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4485568/normal_600242ca6feea.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4481067/normal_603c2b99a5f6c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4412377/normal_6015585b64942.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4473419/normal_60480a296a08b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403407/normal_5fdc7e615e7d1.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4383567/normal_5ff51a26a1758.pdfIn PDF document text
    • http://jukexufepezaj.22web.org/when_a_guy_reappears_after_disappearing.pdfIn PDF document text
    • http://samoe-samaya.ru/english_grammar_book_for_class_600ehb.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://3f735f5a-cd1c-4288-bd93-adeff6e084d9.filesusr.com/ugd/bcc0e4_c34890066c184f50949d38133a1c54c2.pdf?index=trueIn PDF document text
    • http://zotomogizolelaz.rf.gd/20322178621.pdfIn PDF document text
    • https://e2ed8b62-6fde-4093-bd12-ca2fb353b73a.filesusr.com/ugd/2f8cea_01fc5464ec5f468285fe23ea2eaa943d.pdf?index=trueIn PDF document text
    • https://13fad4bf-7224-44b3-802b-16842e97d241.filesusr.com/ugd/b14664_6dc0a80e76ec40818ebc7e5e2ab1d143.pdf?index=trueIn PDF document text
    • https://737bf953-b780-43bc-8af0-312ed5328a40.filesusr.com/ugd/017c44_432dfd4446414b1b99dd7aecc6b483d4.pdf?index=trueIn PDF document text
    • http://naremijex.epizy.com/kindergarten_addition_1-_10_worksheets.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_off00010367.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10367 5340 bytes
SHA-256: 59abfd73f7607bf55cabe88e4b44ddc41bb2720a1512c9f48eca3ed04171c4fc
font_01_sfnt_off00011591.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11591 11964 bytes
SHA-256: f42818eee7e393cab27cbac9a5e0af66f44f7ef1ed89be5f418f1701a63e7534

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