Malicious PDF — malware analysis report

Static analysis result for SHA-256 0edf1797942c6060…

MALICIOUS

PDF

73.7 KB Created: 2021-09-17 22:35:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 597dd5fd6789a5afd53d76833cad492b SHA-1: 96f72a999950e60d76e9ffe72639bb61cb5250e6 SHA-256: 0edf1797942c60605db341cf9508d86da686749ef5478ab6f8e8aa992fcef69d
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was identified as malicious by ML classifiers and ClamAV, specifically flagged as Pdf.Phishing.Trojan. It contains numerous embedded URLs that redirect to various domains, suggesting a phishing or malware distribution scheme. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates the PDF is designed to host many links on disposable domains, further supporting the malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://cructi.ru/uplcv?utm_term=neuroanatomia+de+snell+pdf
    • http://markasib.ru/ckfinder/userfiles/files/55996277699.pdf
    • http://gesundezellen.de/neu/userfiles/file/lakesozuxuwobu.pdf
    • https://greenways.at/userfiles/file/52565807946.pdf
    • https://partetesal.ir/data/file/nabipubadurazar.pdf
    • http://qdsenfeng.com/data/files/24034644071.pdf
    • http://cs-web-design.de/ablage/userfiles/files/19170545059.pdf
    • https://ceramicasvillaflor.cl/UserFiles/File/42200375668.pdf
    • https://client-sms.com/ckfinder/userfiles/files/38798055789.pdf
    • https://beaumont-residence.com/wp-content/plugins/super-forms/uploads/php/files/7agfulp6ou6pb0m3s7og860g4o/82713188732.pdf
    • http://an-ocn.ru/ckfinder/userfiles/files/85621058188.pdf
    • http://gidaero.com/upload/fckeditor/file/30941458669.pdf
    • https://strongpointmarketing.net/userfiles/file/4818755996.pdf
    • http://files.ibiza-ferien.de/file/peredezojot.pdf
    • https://cqc-material.com/app/webroot/userfiles/files/dapoxojamatetexodowo.pdf
    • https://greenbins.ca/ckfinder/userfiles/files/64882741295.pdf
    • http://daglichtfilters.nl/ckfinder/userfiles/files/xadotatulegisu.pdf
    • http://gnatowski.pl/attachments/file/vapikulegixugezi.pdf
    • https://yam-token.com/business_school/uploads/file/gujomevipobapifozukaxe.pdf
    • https://asi-filter.pl/files/file/rarelufefagiwelerasigeru.pdf
    • http://lucchetta.net/userfiles/files/64797574758.pdf
    • https://dsodrecital.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139ea1b82bc2---84093772135.pdf
    • https://crbz.ru/userfiles/file/dogik.pdf
    • http://ametansk.ru/uploads2/nenevewevukuziwum.pdf
    • https://coluer.ir/documents/file/jixazeworijutezejebo.pdf
    • 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://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000bd53.bin
171e8efd03f063815f0070b1869512ae0afd02cdbbbe0077b768a1ead7dd48ef		 pdf-font-stream PDF embedded font (sfnt) at offset 0xBD53 10736 bytes
font_01_sfnt_off0000d5f1.bin
13403e7128eb9c7c7a0dcdb5ef9a30d491f4d07ec683b2e12e09cf1afeb2f509		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD5F1 16836 bytes
font_02_sfnt_off00010171.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10171 16792 bytes

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