Malicious PDF — malware analysis report

Static analysis result for SHA-256 d5860b0347dc6ac0…

MALICIOUS

PDF

89.7 KB Created: 2021-04-03 02:12:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-02
MD5: 1d98e81ebb3af333f9bd7db67e7fa2c3 SHA-1: 0aa0f9abe664b8d923160cf3e9e78be726eb4511 SHA-256: d5860b0347dc6ac0c06a0881d7950c9e0b6fff60fa17fa9ff237748a6db569c9
126 Risk Score

Malware Insights

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

The PDF contains numerous external links, with one prominent URL pointing to 'zajinet.ru', a domain flagged for suspicious activity. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware delivery. The presence of embedded URLs and the 'link farm' heuristic suggest the primary goal is to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://zajinet.ru/strik?utm_term=roomba+620+release+date PDF link annotation
    • http://vvvvvvvvvvvvvvvvvvvvvb.xyz/rogarikugitqvsf4.pdfIn PDF document text
    • https://cdn.sqhk.co/soxuwutitaw/g4hejgg/battle_for_donetsk_airport.pdfIn PDF document text
    • http://jarokixepoweso.mypressonline.com/stochastic_oscillator_book.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4486033/normal_605dbff6c5ce0.pdfIn PDF document text
    • http://micrometer25bill.site/is_it_safe_to_drive_with_engine_management_light_on7f2sg.pdfIn PDF document text
    • http://tpdreport.com/1841122717kgcn7.pdfIn PDF document text
    • http://rabota-plus.club/76938664921hi14h.pdfIn PDF document text
    • https://cdn.sqhk.co/kezomerameki/gdieaKq/weed_leaves_turning_purple.pdfIn PDF document text
    • https://cdn.sqhk.co/suxujaba/xgfQIie/black_football_referee_shoes.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4489440/normal_5fe07726535ba.pdfIn PDF document text
    • https://cdn.sqhk.co/ruxuzobisu/8YRtvgc/health_tips_in_tamil_for_hair_fall.pdfIn PDF document text
    • http://sukuwodexi.scienceontheweb.net/76059278408.pdfIn PDF document text
    • https://cdn.sqhk.co/remavaveso/jfhe7id/sifoboxatafunevit.pdfIn PDF document text
    • https://cdn.sqhk.co/fetebutujo/ieigvja/free_cv_template_2019.pdfIn PDF document text
    • http://lotto-investclub.com/594266934741h0h2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4412161/normal_603961bb1772d.pdfIn PDF document text
    • http://zovolexune.sportsontheweb.net/100_python_interview_questions_and_answers.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/vogubivajavofu/figurative_language_practice_worksheets_6th_grade.pdfIn PDF document text
    • https://s3.amazonaws.com/woxojuxafopuv/shade_of_vampire_book_25.pdfIn PDF document text
    • https://s3.amazonaws.com/piwupevivotixi/apc_smart_ups_1500_battery_replacement_part_number.pdfIn PDF document text
    • https://s3.amazonaws.com/numegubowalonan/tamil_guide_for_class_11.pdfIn PDF document text
    • https://s3.amazonaws.com/tenunud/sample_renunciation_certificate_form_india.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_off00012025.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12025 5548 bytes
SHA-256: 854ec73a5d91a5fa3064828906378b8df0430d63cd5023e11216fbfc585b02a6
font_01_sfnt_off000132e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x132E0 11272 bytes
SHA-256: 839ab4395042ffdbf574da7650be4940f848eebca2a8e2b6bc4a9770479769c8

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