Malicious PDF — malware analysis report

Static analysis result for SHA-256 ac299d558bd5537c…

MALICIOUS

PDF

84.0 KB Created: 2021-03-22 19:42:24 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: ac36b39728634131e051eaa249b2b064 SHA-1: 9680bb37cf7abc3d17f5292cdfa901b50bdd95e9 SHA-256: ac299d558bd5537cfab5c786196be698da643232288fc19afe49e16cd7757385
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file is identified as malicious by ML classification and ClamAV, specifically flagged as a phishing trojan. It contains a link farm with numerous external URLs pointing to disposable hosting domains, suggesting an attempt to redirect users to malicious content. The document body, though heavily obfuscated, appears to be a lure related to a 'Leatherman warranty form'.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://xajibur.ru/123?utm_term=leatherman+warranty+form+pdf PDF link annotation
    • http://bubobimurasawe.iblogger.org/python_3_built_in_functions.pdfIn PDF document text
    • http://xigujawuruwuko.22web.org/discussion_questions_for_letter_from_birmingham_jail.pdfIn PDF document text
    • https://rasiporimi.weebly.com/uploads/1/3/4/6/134614798/tosizadoga_kusiwoparud_kuguj.pdfIn PDF document text
    • https://ruzuxopamekegi.weebly.com/uploads/1/3/4/7/134748505/tatimedapo.pdfIn PDF document text
    • https://fodonisegijiwos.weebly.com/uploads/1/3/1/4/131437376/e4f56933ff0.pdfIn PDF document text
    • https://vutepunuvo.weebly.com/uploads/1/3/1/6/131637517/9255297.pdfIn PDF document text
    • https://fefugenaxidoseb.weebly.com/uploads/1/3/1/3/131380158/nuganogibetibezix.pdfIn PDF document text
    • http://dixajarinuvaw.iblogger.org/kifuxeravebemen.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://munejogi.rf.gd/fusubelizevefevofe.pdfIn PDF document text
    • https://s3.amazonaws.com/vukujidor/algebra_1_cheat_sheet_for_finals.pdfIn PDF document text
    • https://790985df-dfec-4a08-b509-00f37668cf87.filesusr.com/ugd/a421e3_163daa020d0e47009509d2a440662065.pdf?index=trueIn PDF document text
    • https://fb5b3b17-6e6a-47c5-ae49-26eddba71e57.filesusr.com/ugd/aff7be_4d95672bb94644c8a2003d7e35bc65b9.pdf?index=trueIn PDF document text
    • http://zisibife.epizy.com/brazilian_jiu-_jitsu_submission_grappling_techniques.pdfIn PDF document text
    • http://zazupixuwup.rf.gd/xitixadekitibixosarivi.pdfIn PDF document text
    • https://ec679cc6-872a-45a8-b2fd-b1bc8f6ddb77.filesusr.com/ugd/d1d005_d6c760a0d1f64859bdfbd379a09d6dc1.pdf?index=trueIn PDF document text
    • https://b1e6e3cd-24a2-426a-8b7d-e8f4bd81915b.filesusr.com/ugd/83e584_c88740b77a7748fbb1fc818fbee0458b.pdf?index=trueIn PDF document text
    • https://9cf93ecd-64ee-4ad6-afcc-f350577a7522.filesusr.com/ugd/c4dbd3_de8f4dedf52f44938400e62234c0b3eb.pdf?index=trueIn PDF document text
    • https://d09251a9-b09e-4077-8ccb-24037f005f7b.filesusr.com/ugd/a6ce17_37e33a6e040a48c4ab3e8f494ac5ba26.pdf?index=trueIn PDF document text
    • http://bidetorula.rf.gd/81549811980.pdfIn PDF document text
    • https://s3.amazonaws.com/nuxulikiwab/hebel_wall_installation_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/tazopaju/savijedofiji.pdfIn PDF document text
    • https://s3.amazonaws.com/napejaxosinages/11885113735.pdfIn PDF document text
    • https://d668ac4b-7052-46b9-8d0c-7e282d24ced7.filesusr.com/ugd/00fc84_5bf13c7ea66140b0bb06ba8a39ad0975.pdf?index=trueIn PDF document text
    • https://a24bc4ef-4ee2-4fae-af0c-c9fea810b245.filesusr.com/ugd/67d96c_63bd9bb2ac34427a9d6b493342deca0c.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/dutimajizowa/whats_adaptive_behavior.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fe1e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE1E 4948 bytes
SHA-256: 5d7ed9c391a19b59db87684c622138948d96999feb2cd55eae65d2a5f71839e5
font_01_sfnt_off00010ee3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10EE3 11012 bytes
SHA-256: b0551f5804dd80de09e785ab08882baaf3a87b0e8a1dcb51fcfdff0d11a157f6
font_02_sfnt_off0001344e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1344E 4324 bytes
SHA-256: 4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3

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