Malicious PDF — malware analysis report

Static analysis result for SHA-256 b8a7ada16e5bbba4…

MALICIOUS

PDF

76.2 KB Created: 2021-03-18 19:58:30 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-02
MD5: c3c6b09889050be8d93be994c1b3906d SHA-1: a4c537b2b4f613e7dfa7060e68de7b1d278a8023 SHA-256: b8a7ada16e5bbba42605b4d20073661bc4f7f6903b86ebc84b28fc444cbc99f0
126 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many pointing to disposable domains, suggesting a link farm designed to redirect users to potentially harmful sites. The document body, though truncated, contains keywords related to 'capitalizing titles' and 'pdf', likely part of a lure.

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 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://nipisod.ru/award?keyword=capitalizing+titles+pdf PDF link annotation
    • http://madokedaxemosu.22web.org/i_was_there_to_hear_your_borning_cry_lyrics_hymn.pdfIn PDF document text
    • http://itali-big.space/shark_navigator_powered_lift-away_and_steam_mop_bundlel562j.pdfIn PDF document text
    • https://cdn.sqhk.co/sunawopi/d5jBCzo/nenexujegisaponimitegi.pdfIn PDF document text
    • http://fibutogu.mywebcommunity.org/7599705247.pdfIn PDF document text
    • http://rizitakitimomel.iblogger.org/magnavox_sdtv_tuner_remote_code.pdfIn PDF document text
    • http://odemebayisitrafik.com/70359465882kmlnz.pdfIn PDF document text
    • http://everydays.space/bosch_appliance_installation_manualsthai5.pdfIn PDF document text
    • https://cdn.sqhk.co/rajemaramiw/iX7ijFe/40420934184.pdfIn PDF document text
    • http://galosidijixiwu.mypressonline.com/mironovetuxok.pdfIn PDF document text
    • https://cdn.sqhk.co/rapowipijes/EYidJgg/restaurant_flyer_design_templates_free.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://jomupaz.myartsonline.com/sentinel_gun_safe_key.pdfIn PDF document text
    • http://zorufuzelal.rf.gd/basic_civil_engineering_mcq_questions_and_answers.pdfIn PDF document text
    • https://7ffe38df-ef78-47a1-8632-a9c579db478a.filesusr.com/ugd/8ff694_ff985bdb4df343a1be690dac969b5245.pdf?index=trueIn PDF document text
    • http://gesasodalunaka.epizy.com/15487549225.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7c58d478-b84d-40e4-baa8-49561f522ae3/kidogitowizabojoko.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8c4892ce-6c60-41bc-9362-0d9e144e2026/drunvalo_melchizedek_birth_of_a_new_humanity.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3a5d4fdb-e182-4d13-a6f8-6d817d611e77/evenflo_triumph_lx_convertible_2-in-1_car_seat_-_charleston.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/34390d60-3b50-415f-be79-99204dd3575b/is_life_insurance_sales_a_good_career.pdfIn PDF document text
    • http://lavemob.epizy.com/rofegobibefemupubabisoxo.pdfIn PDF document text
    • https://ac4cd5cf-e861-4b1b-a585-e47049f737a6.filesusr.com/ugd/843280_0748961906e3496293a11ad03c338ccd.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ed8e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED8E 5068 bytes
SHA-256: 4e83cf36261f87f90a8d708e6a2b327def674fd9b06218c20499bb6c4a3ae14c
font_01_sfnt_off0000feea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEEA 10868 bytes
SHA-256: cc12dd09f4cba59b502f23a62842739dee877223f0d889cdbabc46e5d1f048db

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