Malicious PDF — malware analysis report

Static analysis result for SHA-256 80ed9c389662ffe6…

MALICIOUS

PDF

71.0 KB Created: 2021-02-18 00:36:29 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: e58b5f88e52155f4095d5c7e5d944490 SHA-1: dbebaa833a5c2b6f341d0fc92a204d3f6f1974b1 SHA-256: 80ed9c389662ffe63c4bc7051fb08ef8cc17c43c44174fdea089cf171cfc5625
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, with a significant number pointing to disposable hosting and exhibiting link farm characteristics. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution. While no scripts were directly extracted, the PDF structure and URL patterns suggest it's designed to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • 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 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://seumenha.ru/wix?keyword=negative+binomial+problems+worksheets PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4407562/normal_600559e73d1c8.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4416798/normal_5fe4d32653761.pdfIn PDF document text
    • http://lolabarafusiru.iblogger.org/air_baltic_app_android.pdfIn PDF document text
    • https://cdn.sqhk.co/rogumabutur/iaRjegh/average_premium_for_whole_life_insurance.pdfIn PDF document text
    • https://cdn.sqhk.co/jezuleku/4dmIR6H/kleptocats_2_safe_codes_kitchen.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4494657/normal_6015efda4fb2c.pdfIn PDF document text
    • https://cdn.sqhk.co/tazifawixax/cHiegeY/tactical_heroes_2_platoons_apk.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4420927/normal_601b2ee11c7f5.pdfIn PDF document text
    • https://cdn.sqhk.co/wemopizajazo/b2HDibE/world_cup_1990_final_full_match.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4408713/normal_6001d35c6a1b0.pdfIn PDF document text
    • https://cdn.sqhk.co/rawerusiwala/eEqijMA/pibage.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4450156/normal_5ff9b037d31a1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403681/normal_602a0080306fe.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://datatoxozapi.epizy.com/cisco_packet_tracer_6._2_free_softonic.pdfIn PDF document text
    • https://s3.amazonaws.com/lepefi/3897232610.pdfIn PDF document text
    • http://pirajog.epizy.com/car_bulb_fitment_guide.pdfIn PDF document text
    • http://pasalalu.rf.gd/ministry_of_sound_bluetooth_speaker_manual.pdfIn PDF document text
    • https://s3.amazonaws.com/figidireki/balance_sheet_format_in_excel_for_doctor.pdfIn PDF document text
    • http://zifasodokid.epizy.com/apega_competency_based_assessment_guide.pdfIn PDF document text
    • http://xexelakufakeze.epizy.com/worksheet_playground_equipment.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_off0000d677.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD677 5560 bytes
SHA-256: ececfab2abb1c87876eeb6cd9b99c906705a85daf5d72bf5ef4727aed6e032e7
font_01_sfnt_off0000e953.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE953 11236 bytes
SHA-256: 0de236354731455a6b0ca0f6dd0e77ab544a5bfb0d0941580b97d41174594264

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