Malicious PDF — malware analysis report

Static analysis result for SHA-256 34760c19662225ef…

MALICIOUS

PDF

91.6 KB Created: 2021-04-05 00:52:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 13eb69e2a5f6e17c6f9770eafaf76fc8 SHA-1: 2ded4a2efd1f0bd4870c74fa32efc0b1d61ae563 SHA-256: 34760c19662225efdba16e3c1caac5cab3da0a47330eb1a879ff76a61d2edd7a
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, with a critical heuristic identifying it as a link farm. One prominent URL, 'https://midufefew.ru/strik?utm_term=constitucion+mexicana+articulo+123+apartado+a', is directly associated with the malicious verdict. ClamAV also detected this file as 'Pdf.Phishing.Trojan'. The document body, though heavily obfuscated, suggests a lure related to legal content, likely to trick users into clicking the 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://midufefew.ru/strik?utm_term=constitucion+mexicana+articulo+123+apartado+a PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4468820/normal_6011ec13bea7b.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4367645/normal_5ff249d9310fd.pdfIn PDF document text
    • http://posebakuxosafod.getenjoyment.net/60006582380.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4401525/normal_5ffa6bf8c34e0.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4467927/normal_5fced2d467477.pdfIn PDF document text
    • http://jajuviramigawo.medianewsonline.com/back_to_school_rules.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4477137/normal_604b6cf33cd46.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/nokiva/8784204539.pdfIn PDF document text
    • https://s3.amazonaws.com/jopomodilamego/28745001448.pdfIn PDF document text
    • https://s3.amazonaws.com/jeromopelurab/professional_development_plan_for_teachers_template.pdfIn PDF document text
    • https://s3.amazonaws.com/napoledunadigo/2004_ford_focus_alternator_removal.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4c2bd15d-cb46-4ae0-af38-d8a713e28a4b/runizusepure.pdfIn PDF document text
    • https://51364a6b-283d-4537-b9df-48522fd8faf2.filesusr.com/ugd/921180_d9a43ba34fd44cb889f01fff40124282.pdf?index=trueIn PDF document text
    • https://fe426b01-1dd0-498a-b08e-7ec37e320b94.filesusr.com/ugd/6b45f0_cad9371235844f3db45245b82d6f6ff9.pdf?index=trueIn PDF document text
    • https://4abf464d-34d5-4c80-8de5-e64f30e04530.filesusr.com/ugd/8b3eb5_f37f631967d5449a92909593861cdca8.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/neviwove/donaldson_oil_filter_cross_reference_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/pezofut/51269456806.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c46616a0-2e77-4bfc-b862-28668eb75d62/beninofikuwusivas.pdfIn PDF document text
    • https://s3.amazonaws.com/vapite/writing_the_breakout_novel.pdfIn PDF document text
    • https://s3.amazonaws.com/wazotojemov/dupape.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_off000126a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x126A2 5540 bytes
SHA-256: 0bb2da7c354ff90ae85f0b372a8d808835d995f5dc29afdffeba9374360cced3
font_01_sfnt_off00013965.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13965 11684 bytes
SHA-256: e6c509b755042ac133c9a482ae160a42f1a192d4ef536611e9fe11d59524df7c

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