Malicious PDF — malware analysis report

Static analysis result for SHA-256 429d74f40095d879…

MALICIOUS

PDF

73.9 KB Created: 2021-02-26 21:16:14 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-12
MD5: 3a7bbc99b4009697410b71248e930f5a SHA-1: 146bed931b0fb31184fef332328ebef0f7863ab4 SHA-256: 429d74f40095d879ba55dfe19b4fabb7d42d59701786986125839b3d3fbab1bf
96 Risk Score

Malware Insights

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

The file is a PDF document that contains an embedded URL, identified as a phishing lure. The ML classifier and ClamAV detection strongly indicate malicious intent. The document body, though heavily obfuscated, appears to be a lure related to 'appeals in writing', directing the user to the external URL for further interaction.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 4

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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/award?keyword=what+are+the+three+appeals+in+writing PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4457592/normal_6037fcbf52b9d.pdfIn PDF document text
    • https://cdn.sqhk.co/nemalerute/gigfggZ/podozolupes.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4481156/normal_5fcebf7088290.pdfIn PDF document text
    • http://rigoditibalun.mywebcommunity.org/what_is_honesty_definition.pdfIn PDF document text
    • http://libuwapuvewipev.mywebcommunity.org/ga_1000_replacement_band.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4457854/normal_5fc75cb627d4e.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4374372/normal_5fcf07880e517.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4453902/normal_6005e6bae4029.pdfIn PDF document text
    • https://cdn.sqhk.co/pigajifaw/jgdXsij/bikutewiwufa.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4489050/normal_602b8355a0c58.pdfIn PDF document text
    • https://cdn.sqhk.co/vumorumuvogi/DIWppjj/download_survive_wilderness_survival_mod_apk.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408878/normal_601e6aeda389c.pdfIn PDF document text
    • http://nefuwumimo.iblogger.org/fight_flight_freeze_response_worksheet.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://xonezerimagu.rf.gd/5183969224.pdfIn PDF document text
    • http://womepulus.epizy.com/fedawe.pdfIn PDF document text
    • http://rorewoj.rf.gd/microbe_bovine_spongiform_encephalopathy.pdfIn PDF document text
    • http://nedilopasosugop.epizy.com/guardian_crossword_15311_answers.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_off0000e60d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE60D 5188 bytes
SHA-256: 3c6af9c1edc4cdab2a238549390f9f0047545727fb4d44bd0d672c852bda9c25
font_01_sfnt_off0000f7c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7C3 10228 bytes
SHA-256: 8f998b752237f8a444891cb28ab9ad45e2097e841e410549dc02f1fa9d2ad41d

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