Malicious PDF — malware analysis report

Static analysis result for SHA-256 038614ebe751c22f…

MALICIOUS

PDF

71.7 KB Created: 2021-04-20 22:33:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 425687daf886587b12a53c728e81077d SHA-1: 28cafc800379c897538f2c05cd6b4e02d2d2c99d SHA-256: 038614ebe751c22fc5ab398dcb9cfc290732fee0430a67d8389d9066d86bf5e1
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to disposable domains and are associated with link farms, indicating a phishing or scam attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. The document body, though heavily obfuscated, appears to be related to search terms for free software, reinforcing the lure.

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://mezovuduw.ru/strik?utm_term=foxit+pdf+creator+software+free+download PDF link annotation
    • https://cdn.sqhk.co/kugugofawaz/giiFgfw/soccer_tactics_and_glory_switch.pdfIn PDF document text
    • http://deflecfcvy.best/pajelesudetakumevivawet8ptuj.pdfIn PDF document text
    • http://vengriya.space/homemade_vanilla_pound_cake_recipe_from_scratchdcaax.pdfIn PDF document text
    • http://store50off.info/21050121714ibj6s.pdfIn PDF document text
    • http://websporizle4.com/32995924898z3flh.pdfIn PDF document text
    • http://vitrinachel.ru/tejokosemuxojuza3n424.pdfIn PDF document text
    • https://cdn.sqhk.co/ganuniwiku/jhhjghj/reversion_clause_real_estate.pdfIn PDF document text
    • http://mail-autoscout24.net/3241386071624lg8.pdfIn PDF document text
    • http://itfamily.info/574803856654gdvh.pdfIn PDF document text
    • https://cdn.sqhk.co/povuguzuloga/ghT3Li3/download_assassin_archer_modern_day_robin_hood.pdfIn PDF document text
    • http://neuroncraft.online/8441435015tk56v.pdfIn PDF document text
    • https://cdn.sqhk.co/zusisoko/ajfsgdd/king_of_avalon_kvk_tips.pdfIn PDF document text
    • https://cdn.sqhk.co/pigevikuwi/ijrfv0c/venice_travel_guide_app.pdfIn PDF document text
    • http://kellys.space/gray_s_anatomy_review_book5y0dp.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/lezerawe/el_nuevo_houdini_chapter_7.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/72863653-165c-4870-a762-549c0215d862/how_do_you_calibrate_a_vizio_tv.pdfIn PDF document text
    • https://s3.amazonaws.com/tujeviwakirawu/subometamibaza.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d83c8ef0-8988-4604-8a78-9553abfa12e6/how_to_calculate_the_surface_area_of_cylinders.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/56ea16e5-6631-41e4-8223-d407b1a6532a/navubatevare.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7fe74c0c-dbb4-4c90-8c04-2f8da567f6a5/2574126201.pdfIn PDF document text
    • https://s3.amazonaws.com/befarekogol/jajitikilozimulemenif.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7ae4d3c4-a645-473e-930c-af5a78ccd09a/black_and_decker_quick_and_easy_food_processor_fp1445_parts.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_off0000d953.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD953 5264 bytes
SHA-256: f26d05c965316a8963e8f5c2bcaf9de0f6779986baafecf0798a56bb1aceda1a
font_01_sfnt_off0000eb64.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB64 11336 bytes
SHA-256: d47a144840fcb0b9a7c05c2f2ad0d0c2b0b427bba8f88db985f841f3511659c3

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