Malicious PDF — malware analysis report

Static analysis result for SHA-256 33044f8f052f60c4…

MALICIOUS

PDF

82.3 KB Created: 2021-01-19 22:42:17 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: b1b41ae6d41eb4c6de3741599242ae01 SHA-1: 7aef9c575a392b97903b9330cd55675b7a5c810d SHA-256: 33044f8f052f60c4398b3cef04af910baee7aa66152c3af457d2e62c148e3791
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was identified as malicious by ML classifiers and ClamAV, with a critical heuristic firing for a link farm. It contains numerous external links pointing to other PDFs hosted on disposable domains, suggesting a phishing or content distribution scheme. The document body is heavily obfuscated and contains metadata from wkhtmltopdf, indicating it was likely generated programmatically to serve as a lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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 contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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://trafffi.ru/123?utm_term=magnitude+of+displacement+vs+distance PDF link annotation
    • https://site-1178186.mozfiles.com/files/1178186/sisters_of_battle_pre_orders.pdfIn PDF document text
    • https://fidegobopoj.weebly.com/uploads/1/3/2/8/132815019/5189794.pdfIn PDF document text
    • https://site-1226241.mozfiles.com/files/1226241/gabajutoxunixa.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4404113/normal_5ff58b9660b17.pdfIn PDF document text
    • https://site-1176985.mozfiles.com/files/1176985/pocket_tanks_deluxe_apk_pc.pdfIn PDF document text
    • https://site-1252609.mozfiles.com/files/1252609/bahaddur_kannada_songs_2014.pdfIn PDF document text
    • https://pebepatesova.weebly.com/uploads/1/3/4/4/134447190/8797853.pdfIn PDF document text
    • https://giromazipudu.weebly.com/uploads/1/3/1/4/131453901/6182065.pdfIn PDF document text
    • https://tunoritusaw.weebly.com/uploads/1/3/5/3/135328070/fcc16074535a8c.pdfIn PDF document text
    • https://cdn.sqhk.co/lokutibu/shakhak/vojavesadamutapaje.pdfIn PDF document text
    • https://cdn.sqhk.co/lawafopugu/zgjjaha/ketixu.pdfIn PDF document text
    • https://fuvapevamasazu.weebly.com/uploads/1/3/4/5/134507747/lidojogepe_deronivoli_xevudixunop_pevebiduj.pdfIn PDF document text
    • http://nutapobo.iblogger.org/82449976643.pdfIn PDF document text
    • https://cdn.sqhk.co/tavikagisato/ggig9hd/dash_dungeon_tomb_runner_dungeon_quest.pdfIn PDF document text
    • https://site-1174957.mozfiles.com/files/1174957/99766200327.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://munoxefarofow.rf.gd/welurosufen.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f6cb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6CB 3092 bytes
SHA-256: 1089be148d3ffa9b78478a2b1c6949216fddc346659278ecfd3be4dc520353c8
font_01_sfnt_off000101c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101C4 5444 bytes
SHA-256: ce600f0b2c47945dfc5e17b23dcf552ec9873b74e00566c2139e84c668e4d386
font_02_sfnt_off00011461.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11461 11712 bytes
SHA-256: b7bf23e5207f6c3dca23171ef44ca5266995b8363b8782cf900cfb1dd903eebc

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