Malicious PDF — malware analysis report

Static analysis result for SHA-256 c04e9d210e5aa7ad…

MALICIOUS

PDF

80.5 KB Created: 2021-09-18 15:02:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 278340352f5fefaaa1d03a448c3df122 SHA-1: 936658b222bf75c5363e813537d5e466fb720a30 SHA-256: c04e9d210e5aa7ad6f45d690c87f72ca59c811c377d777f2bfa7959324e1fdff
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or malware distribution attempt. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' suggests the document is designed to host numerous links on disposable domains, likely to redirect users to malicious content. While no scripts were explicitly extracted, the presence of embedded URLs and the nature of the link farm heuristic point towards an attack pattern involving user redirection to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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 http://pinxedien.net/upload/files/konesorikolakole.pdf
    • http://renknh.com/ckupload/files/3704209812.pdf
    • http://ahrestygz.com/userfiles/files/20210911_092321.pdf
    • https://mamotato.ro/userfiles/file/78010558772.pdf
    • https://dp-engineers.com/admin/userfiles/file/lilukajazutavefojakanagix.pdf
    • http://gugugroup.com/userfiles/tatosabaf.pdf
    • https://thuaphatlaihoanghuy.com/uploads/files/fiwiposugu.pdf
    • http://ciaomamma.hu/editor_up/729813377.pdf
    • http://okun.su/upload/file/23044843354.pdf
    • http://afro-safari.com/upload/files/54362938038.pdf
    • http://classtool.info/upload/files/kaserewizikawon.pdf
    • http://godsownproperties.com/userfiles/file/bokujew.pdf
    • https://siriusdynamics.com/assets/uploads/files/liwutajito.pdf
    • https://www.idromeccanicasrl.com/idromeccanicasrl.com/wp-content/plugins/super-forms/uploads/php/files/6a2b37194f63b7ff0176b6eadeb79a80/14423245119.pdf
    • http://websurin.net/UserFiles/File/dunuromazikezalinikobapi.pdf
    • https://millvalley.com/wysiwygfiles/file/67863665367.pdf
    • http://uleshuzatshop.hu/files/file/kutefakufekijuzekubipo.pdf
    • https://pfgmm.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1614427e34bee0---10660431841.pdf
    • http://digjamaica.com/app/webroot/files/bavadenejutorufede.pdf
    • http://inimtrento.it/userfiles/files/29892630539.pdf
    • https://reitinguok.lt/userfiles/file/32905369125.pdf
    • http://pandoraecza.com/genelresimler/file/73334953360.pdf
    • http://oa30us.com/userfiles/file/70166715462.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=best+story+saver+app+for+instagram
    • 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_off0000d58d.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD58D 16792 bytes
font_01_sfnt_off0000ed9f.bin
9ed88889187d2968245392e23b65dde4b0d1fd9380d0f1e5ad12d577d8950141		 pdf-font-stream PDF embedded font (sfnt) at offset 0xED9F 17892 bytes
font_02_sfnt_off00011b04.bin
e31b57ef62a69d969349c5994c0ce0e9bc4089dd5b52bc455531d33920b1804c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11B04 10888 bytes

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