Malicious PDF — malware analysis report

Static analysis result for SHA-256 3afc529678150542…

MALICIOUS

PDF

88.5 KB Created: 2021-09-21 09:20:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 263ff12af85120e08a69bd857a5fb6df SHA-1: 37c5be529f8c9c46fdd17efcb1cb85d7fe486648 SHA-256: 3afc5296781505427a4ae45e183318ec54b2d7962f59b450afd708ceeca9f39b
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many pointing to disposable domains, suggesting it's designed to lure users to malicious sites. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly indicates a link farm intended for malicious redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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://dobre-akce.cz/media/files/file/43523758218.pdf
    • https://fwstc.in/userfiles/file/xijiwanumizojutasejidu.pdf
    • https://stellabakingcompany.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135dd0fce39c---dajimisavedeforababu.pdf
    • https://taucaotoccatba.vn/images/news/files/nituzuxiwuzuputuwoseporik.pdf
    • http://xn--80aafkatcapceshpicpg3h.xn--p1ai/pict/file/buzojotenowewujaf.pdf
    • http://csc0516.com/userfiles/file/20210912012939_g9wz5i.pdf
    • http://tjjjsh.com/uploads/files/14235069802.pdf
    • http://lonerangerfanclub.com/ckfinder/userfiles/files/53367228111.pdf
    • https://wisestudentz.com/userfiles/file/27488757473.pdf
    • https://hopefor.today/wp-content/plugins/super-forms/uploads/php/files/d23e1cd8c54463284cefa01f023bcae5/32129883291.pdf
    • https://tekstilkentrehber.com/upload/ckfinder/files/12687433051.pdf
    • http://wideanglepackaging.com/ckfinder/userfiles/files/67027903882.pdf
    • http://cl-pub.com/files/files/17434240452.pdf
    • http://sklepjola.pl/userfiles/file/49205383143.pdf
    • https://btsmstlucia.com/atomicsteps/upload/userfiles/file/xurumolojoxufidadibaj.pdf
    • https://pelletier-tp.fr/ckfinder/userfiles/files/wifurijetumij.pdf
    • http://veterina-hrib.cz/user-uploads/files/tiwut.pdf
    • http://www.louisianarebarcontractor.com/editorimg/file/vopukinekifegexu.pdf
    • http://usaoxin.com/userfiles/2021-9/file/67156265685.pdf
    • http://accessibilite-salle-eau.com/ckfinder/userfiles/files/jepapaparamugibakosara.pdf
    • https://afra24.com/basefile/afra24/files/18126557998.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=love+text+art+copy+paste
    • 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_off0000efab.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEFAB 16792 bytes
font_01_sfnt_off000107bd.bin
7506bd299095452ac3767456f2fe9eba6da1f01bb097eab9218f9a9b177c1c31		 pdf-font-stream PDF embedded font (sfnt) at offset 0x107BD 20172 bytes
font_02_sfnt_off00013cb1.bin
a9754e57b78d2e21261918d28ba7e5df382386f02350c7eaa00b390a9467678d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13CB1 10364 bytes

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