Malicious PDF — malware analysis report

Static analysis result for SHA-256 436b4f3314162800…

MALICIOUS

PDF

79.0 KB Created: 2021-03-06 22:52:00 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-02
MD5: d6167d84e94bf4f3770b871943047dc9 SHA-1: c913b5e89783f2ce52a6899deb33f1b3b92bf216 SHA-256: 436b4f33141628000c87072b2ffc0affacb12a39bd1a67692c3b2cf99765a0b7
126 Risk Score

Malware Insights

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

The file is identified as malicious by ML classifiers and ClamAV, with high-confidence heuristics indicating it's a link farm on disposable hosting. It contains numerous embedded URLs pointing to potentially malicious sites, suggesting an intent to redirect users. While no scripts were explicitly extracted, the PDF structure and embedded URIs are typical of phishing or malware distribution lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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 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://ponafet.ru/wix?keyword=sss+and+sas+similarity+postulates+worksheet PDF link annotation
    • http://nawogevimogagu.22web.org/billing_invoice_template_word.pdfIn PDF document text
    • http://counterman.ru/502403197986ap6f.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4480595/normal_5ff4a826f1ce9.pdfIn PDF document text
    • http://argo-tourism.com/zara_usa_locations_in_marylandz4n90.pdfIn PDF document text
    • http://sale20.site/party_hard_go_apk_download_free6zhbb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4386087/normal_5fe933f8ecdfc.pdfIn PDF document text
    • http://fozovozazu.iblogger.org/montreal_cognitive_assessment_moca_spanish.pdfIn PDF document text
    • http://jemofukamuwol.22web.org/64081929433.pdfIn PDF document text
    • http://zenarajare.22web.org/financial_reports_companies_australia.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4451737/normal_5ff75774790d2.pdfIn PDF document text
    • http://cmb-accueil.com/molazifi0k0zw.pdfIn PDF document text
    • http://ins.expert/big_little_lies_season_3_reviewwg0gd.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4501963/normal_6035334bcd769.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4383471/normal_5feb110f53a3b.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
    • https://uploads.strikinglycdn.com/files/a8911d77-64a3-4a5a-982a-f53720f9416b/formuler_f4_turbo_set_top_box.pdfIn PDF document text
    • https://3485775d-af35-4505-8fb4-f6750f575e04.filesusr.com/ugd/42f18e_390fc2f0c9754db1bd855ecc335db63b.pdf?index=trueIn PDF document text
    • https://45dcde1a-aed5-4138-b95e-a0f768a283bf.filesusr.com/ugd/89441e_a56b5678e3d94c8f8604fc779e844991.pdf?index=trueIn PDF document text
    • https://6843e3eb-5573-46e1-90a0-370cfc2b4a0d.filesusr.com/ugd/89b1bc_134455a27ef84961a1722002c5b47012.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/bc796f8b-3fdf-45fa-aa78-c09d16323bd0/thule_bike_rack_hitch_extension.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d34a6f57-624a-4225-8fdf-88c59f579411/persona_4_golden_walkthrough.pdfIn PDF document text
    • https://506dbbd1-d4b3-44b1-a4c9-6b5d0cab6a23.filesusr.com/ugd/c75f60_39a393178bd2405da909689c4bf42d33.pdf?index=trueIn PDF document text
    • http://zifezerolivuba.epizy.com/openshot_video_editor_filehippo.pdfIn PDF document text
    • https://952d9f4b-853a-4e85-af28-23c4d489d487.filesusr.com/ugd/8db125_52f3153a91b4411ea0f16b27ec544c6f.pdf?index=trueIn 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_off0000e841.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE841 5444 bytes
SHA-256: 33c7f4fc19e1130157f961f171b7a1998ed93d11b7f13d39bc224bee385e433c
font_01_sfnt_off0000fa9c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA9C 11680 bytes
SHA-256: b56db439ef8bc78018b31a131d5033e13abef4cd40334852db36e63649e77d31
font_02_sfnt_off0001205e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1205E 4324 bytes
SHA-256: a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f