Malicious PDF — malware analysis report

Static analysis result for SHA-256 78918604781d8798…

MALICIOUS

PDF

71.9 KB Created: 2021-01-26 10:33:33 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-16
MD5: 447113985ae3c25526c548c4aa09ef4f SHA-1: 79ca8e7c170870cc7d862a6c5f6464911bbfd7d4 SHA-256: 78918604781d87986289bb32b977dc78cd321f7571debdf43deecc0ecf7b0734
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The presence of numerous external URIs, including one pointing to 'traffset.ru', suggests a phishing or malware distribution attempt. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' further supports this by indicating the PDF is part of a link farm hosted on disposable domains, a common tactic for obscuring malicious destinations.

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://traffset.ru/123?utm_term=vaniville+town+theme PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4407813/normal_5fdf7eb185017.pdfIn PDF document text
    • https://woniwisupu.weebly.com/uploads/1/3/4/2/134266019/2244853.pdfIn PDF document text
    • https://cdn.sqhk.co/verexoleki/NgjhczI/sniper_arena_pvp_army_shooter_hack_apk_download.pdfIn PDF document text
    • http://akvatehnika74.ru/wings_of_fire_graphic_novel_4nzqxv.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4466664/normal_5fcb43968f371.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368224/normal_5fd6f7f9b017e.pdfIn PDF document text
    • https://cdn.sqhk.co/waximanodif/fia9tJR/english_to_tamil_dictionary_offline_app_free_download.pdfIn PDF document text
    • http://tgesheff.xyz/bumofikuxi8yn15.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4466680/normal_5fdc00c5c8653.pdfIn PDF document text
    • https://xigeworimejol.weebly.com/uploads/1/3/1/4/131483719/jagoz_kesuzi_tujomiko.pdfIn PDF document text
    • https://tekeginisexufu.weebly.com/uploads/1/3/1/3/131381150/kosuk.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4418013/normal_5fe5f6b66177f.pdfIn PDF document text
    • https://cdn.sqhk.co/baxorurifina/No5ihbQ/ice_ballerina_dancing_battle_dress_up_games.pdfIn PDF document text
    • https://cdn.sqhk.co/nulogoxeja/ibYjfia/offroad_outlaws_money_cheat_code.pdfIn PDF document text
    • https://fezadegijowazon.weebly.com/uploads/1/3/4/0/134096780/xasolijuxafikinawig.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/suxugipipolazog/pokemon_battle_tower_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/sojuravewi/68773680696.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_off0000deae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEAE 4768 bytes
SHA-256: 6df139524439ccd8084d7c0d65c857069c3a0830bb5f5577d2b076eb73533f60
font_01_sfnt_off0000eed4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEED4 10584 bytes
SHA-256: 9dda90fdac1c8fa06a13c7130fb9f2f5267fa9c03616d4b05e4b75ad31330153

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