Malicious PDF — malware analysis report

Static analysis result for SHA-256 53bd62ab6263f250…

MALICIOUS

PDF

82.7 KB Created: 2021-09-14 16:03:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: e4c813d8206b31ba81431b716151d21a SHA-1: d4f70bc15193695ac71ea5388759450d09b58e19 SHA-256: 53bd62ab6263f250c321e556fe59f7ba11294c6d65a495b765e54e21992ed8a8
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to disposable hosting and are structured as link farms, a common tactic for phishing or malware distribution. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' specifically flags this behavior. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://laborke.ru/uplcv?utm_term=truck+simulator+hack PDF link annotation
    • http://jevades.com/aircraft/fckimages/file/42187289769.pdfIn PDF document text
    • http://forma8.kz/ckfinder/userfiles/files/78831910919.pdfIn PDF document text
    • http://bavlas.lt/ckfinder/userfiles/files/damirofenekagos.pdfIn PDF document text
    • http://itcbeautytrainingschool.com/userfiles/file/maxawivegilupununimexox.pdfIn PDF document text
    • http://mayinluatudong.com/uploads/userfiles/file/rulol.pdfIn PDF document text
    • http://megalabsrl.it/userfiles/files/sabefedudix.pdfIn PDF document text
    • http://assushop.com/userfiles/assushop.com/file/88396274130.pdfIn PDF document text
    • https://www.mppoa.cloudlinesystems.com/assets/ckfinder/userfiles/files/14986897872.pdfIn PDF document text
    • https://avistravel.ro/userfiles/file/14139307260.pdfIn PDF document text
    • https://shopexpert.com/app/webroot/files/userfiles/files/6022395892.pdfIn PDF document text
    • https://aguiapromocional.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613032b8d034b---nesinoxevezewe.pdfIn PDF document text
    • http://mueblesdepladur.es/1/userfiles/file/62470600298.pdfIn PDF document text
    • http://loaamtran.vn/files/usersfiles/files/bijime.pdfIn PDF document text
    • https://festivaldelmaridaje.com/sgi_userfiles/userfiles/files/96416287071.pdfIn PDF document text
    • https://www.physioaktivkramer.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613675ee7c97a---xonanupodemubevege.pdfIn PDF document text
    • http://yongqingtech.com/d/files/xufuferumeganu.pdfIn PDF document text
    • http://haiphongcontest.com/images/files/14147959378.pdfIn PDF document text
    • https://doluhosting.com/calisma2/files/uploads/jevedan.pdfIn PDF document text
    • http://uptownchantilly.com/uploads/files/bobixeje.pdfIn PDF document text
    • http://www.huescalamagiaenfotos.com/userfiles/files/dafekaje.pdfIn PDF document text
    • https://zhansq.cn/upload/file/polem.pdfIn PDF document text
    • http://puntolinea.org/userfiles/files/guzosumalupozevokopegazu.pdfIn PDF document text
    • http://poongdung.com/FileData/ckfinder/files/20210902_1E5390F48C53ECFE.pdfIn PDF document text
    • http://canavesiobruno-architetti.it/userfiles/files/mogivedotagilikozo.pdfIn PDF document text
    • http://vendsol.com/userfiles/file/xuvita.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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e039.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE039 10412 bytes
SHA-256: 30ff5b8760039028ca043146dae90a37226e808ab906572502511236da90683c
font_01_sfnt_off0000f7dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7DD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010fef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FEF 17588 bytes
SHA-256: 49f3246961434545090298c67000d124f454f73326b136b5cbeb74e35b66a559

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