Malicious PDF — malware analysis report

Static analysis result for SHA-256 056cf76518a10d68…

MALICIOUS

PDF

74.0 KB Created: 2021-09-19 14:52:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 031a14e1e030a46a978f7c57f5947b0b SHA-1: af51bda9f1f3c8a903fc7dec1a723f9e5ca6ba30 SHA-256: 056cf76518a10d68a417a5bdf74550d6ad8848c89062529349b9a1505276912f
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to disposable hosting and are structured as link farms. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The embedded JavaScript is likely used to facilitate the redirection to these malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 6

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://infrive.ru/uplcv?utm_term=watch+harry+potter+chamber+of+secrets+putlocker
    • http://klm-co.ru/foto/ck/files/39380461248.pdf
    • http://djapm.com/userfiles/file/tuxuxijonitumobapoxekis.pdf
    • http://traslochimontalto.it/userfiles/files/42940115143.pdf
    • http://kartelabasligi.com/images_upload/files/37926375867.pdf
    • https://kmkmekanik.com/upload/ckfinder/files/febewidiromusilonoviduze.pdf
    • https://geniodelweb.com/file/20899775574.pdf
    • https://net-mex.hu/ckfinder/userfiles/files/waladiporen.pdf
    • https://afritransport.com/app/webroot/files/file/zarofovolixagirenu.pdf
    • http://ktcz.eu/files/files/mapupulafezuroverafadu.pdf
    • http://asja-doll.ru/userfiles/file/74857500927.pdf
    • http://yishiweb.com/upfiles/files/20210918_144634.pdf
    • https://dongytueduc.com/wp-content/plugins/super-forms/uploads/php/files/sackc3rkibd8algo86rbn1be8h/74369491850.pdf
    • http://wieswioska.pl/userfiles/file/57807094364.pdf
    • http://www.virtualaid.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1613ddac0cf611---31886347147.pdf
    • http://www.jacenter.org/js/ckfinder/userfiles/files/42042309029.pdf
    • https://niboparis.com/upload/fckeditor/files/11115850969.pdf
    • https://mepho.hu/ckfinder/userfiles/files/27433704313.pdf
    • http://www.idukkidiocese.org/files/js/ckfinder/userfiles/files/21020822179.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_off0000bbc2.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xBBC2 16792 bytes
font_01_sfnt_off0000d3d9.bin
a3a8346c9875292b8b53c6869be5979eb4374b9514e62eb5ec8a55bb248ec719		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD3D9 10988 bytes
font_02_sfnt_off0000ed45.bin
3d33c1e518d2cae9615850372743b2c18b14788a3c76931d3cc907c4ad274741		 pdf-font-stream PDF embedded font (sfnt) at offset 0xED45 17368 bytes

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