Malicious PDF — malware analysis report

Static analysis result for SHA-256 f1be8324a1f9ad35…

MALICIOUS

PDF

108.6 KB Created: 2021-04-17 16:05:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 5931a7ef42e7709f30d1ecf44bcfbd46 SHA-1: 5ee0de96bc0c488032c28b740ac68d90a3046d06 SHA-256: f1be8324a1f9ad35a270c79420ae8068e5332bc87f4d180c342078cfee61d454
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, with a high heuristic score indicating it functions as a link farm on disposable hosting. The document body, though heavily obfuscated, suggests a lure related to Mexican constitutional law, likely to disguise the malicious intent of redirecting users to external sites.

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/strik?utm_term=articulo+numero+117+de+la+constitucion+mexicana
    • https://zuwifitevekamug.weebly.com/uploads/1/3/3/9/133989089/5c7f146cb.pdf
    • https://cdn-cms.f-static.net/uploads/4483855/normal_604752f8a97dc.pdf
    • https://cdn.sqhk.co/lisutovudaf/2igJhcB/santorini_greece_flights_from_us.pdf
    • https://cdn-cms.f-static.net/uploads/4379851/normal_5fea1ee5e898b.pdf
    • https://cdn.sqhk.co/fegibidizog/czhchfu/final_fantasy_xvi_xbox_series_x.pdf
    • https://gojatoxemoniro.weebly.com/uploads/1/3/4/8/134894745/3726764.pdf
    • https://static.s123-cdn-static.com/uploads/4476601/normal_5fffc9e8c7e6c.pdf
    • https://wemosixalaku.weebly.com/uploads/1/3/4/3/134315089/rarexuzene.pdf
    • https://static.s123-cdn-static.com/uploads/4375907/normal_600897242b3dc.pdf
    • https://cdn-cms.f-static.net/uploads/4389804/normal_6059dce9e0ee6.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/pegebunov/wubutejazam.pdf
    • http://futoxivugumerav.epizy.com/47604500753.pdf
    • https://329f26c8-0235-4118-8622-173d264d9cf1.filesusr.com/ugd/221f3a_36c653db2b6342168ce6eac999d84906.pdf?index=true
    • https://s3.amazonaws.com/mubemutolewe/bs_formu_dzeltme_nasil_verilir.pdf
    • http://bitumexupun.epizy.com/25533239125.pdf
    • https://7fe1f042-206b-4735-a408-f56337efeeb4.filesusr.com/ugd/d34b51_93d71080d51a4ec6a571e910d1c6b8eb.pdf?index=true
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00016ba9.bin
b40e625bbaf30494876ede8c516d74438c6ae4e6bb4ae6f7696196cd766c85d0		 pdf-font-stream PDF embedded font (sfnt) at offset 0x16BA9 5276 bytes
font_01_sfnt_off00017d8b.bin
7bc4a33bcfcec2a0a3c4c364295d4a16bfd0a749711164b3876de2ac90b2cec0		 pdf-font-stream PDF embedded font (sfnt) at offset 0x17D8B 11880 bytes

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