Malicious PDF — malware analysis report

Static analysis result for SHA-256 f9c8190497c40f84…

MALICIOUS

PDF

75.9 KB Created: 2021-04-10 15:43:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-13
MD5: 39c9eb48794ec701e8c0b259b9de9fb2 SHA-1: 2f3cc2186c32ac596b97fe1ab11ff3775f8ef81f SHA-256: f9c8190497c40f846e2c5e5afa63b95e6edcc32bb4143f733391aceed4527f3a
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file contains numerous external links, identified by the PDF_SEO_LINK_FARM heuristic, with a primary suspicious URL pointing to 'vilenefex.ru'. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution. The document body, though heavily obfuscated, contains metadata suggesting it was generated by wkhtmltopdf, a tool often used to create PDFs from web content, potentially to disguise malicious links.

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://vilenefex.ru/strik?utm_term=what+was+the+significance+of+the+insular+cases PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4377924/normal_603bbd20c8c1e.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/nonipesikiri/fugukagebeganugu.pdfIn PDF document text
    • https://s3.amazonaws.com/kisagoz/android_vs_iphone_camera_quality.pdfIn PDF document text
    • https://s3.amazonaws.com/gurowozenupifi/713657239.pdfIn PDF document text
    • https://6e00f30c-c2f4-4f8b-b3fa-04142e93d3a6.filesusr.com/ugd/7b3c9f_f1038fb7f9194c1a9dd63d958077f5b3.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/bufexa/pitonuwuxofufofimilag.pdfIn PDF document text
    • https://06ebba1c-c738-45d4-b58d-83edbdcc9420.filesusr.com/ugd/b14caa_169ec2e63c7d4bfa952573a2ebf89090.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/jijumupade/45419691303.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/47f278bc-45f2-43de-8381-5308e2b2f74b/toro_ss5000_blades_wont_engage.pdfIn PDF document text
    • https://s3.amazonaws.com/gonafoziguwewe/analise_combinatoria_exercicios_vestibular.pdfIn PDF document text
    • https://s3.amazonaws.com/mozedijiz/bobcat_s650_service_manual.pdfIn PDF document text
    • https://s3.amazonaws.com/widetunipet/vinanekomogo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e86f7df0-0ccf-4240-9af0-c92bb7edd16b/why_is_my_paint_spray_gun_spitting.pdfIn PDF document text
    • https://s3.amazonaws.com/meludav/why_wont_my_kindle_fire_take_a_charge.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_off0000ea38.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA38 5248 bytes
SHA-256: f907d191c845658c0c10376d0290ce4514ce4477fd9f879f456401d6b87e4a39
font_01_sfnt_off0000fc2b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC2B 11364 bytes
SHA-256: 50427ea3e0ed82fa85fea6f72db31b165f021fdeb91b73ae57e5f898059ef67c

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