Malicious PDF — malware analysis report

Static analysis result for SHA-256 36113d42dde919fb…

MALICIOUS

PDF

167.5 KB Created: 2021-09-21 11:31:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 80fea2a85b185268b05fc431dba9d3ce SHA-1: c4c1dc790c013d57cd53659feeac1809ccdea781 SHA-256: 36113d42dde919fb7f19fdf1daee8990daf3457570fee476d95b26e3362fda50
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains embedded JavaScript and a large number of external URIs, many of which are hosted on disposable domains. 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 0.9981

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://medvor.ru/uplcv?utm_term=photograph+tabs+nickelback
    • http://eksternest.be/images/file/pejaki.pdf
    • http://uhorder.com/upload/files/tarukomekofaxusopogat.pdf
    • http://jayeonrak.com/upfile_editor/2021/files/zekopu.pdf
    • https://bikeid.net/ckfinder/userfiles/files/vusupanowojobufofibite.pdf
    • https://mandalaconfeccao.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613ed931da98d---xalimop.pdf
    • https://konferencii.ru/js/ckfinder/userfiles/files/45606607040.pdf
    • https://vivekanandbawwa.com/userfiles/file/67792431492.pdf
    • http://knx-shop.ru/admin/ckfinder/userfiles/files/xijobavudolaxafafigabek.pdf
    • http://borisovhlebprom.by/var/upload/file/90533649842.pdf
    • https://tch.lu/files/files/fufesonuzovava.pdf
    • http://smarttechsolutionukltd.com/uploaded_files/userfiles/files/pulunavofow.pdf
    • https://www.ewdel.cz/ckfinder/userfiles/files/15809229421.pdf
    • http://beergolfers.com/blog/images/file/39343405649.pdf
    • http://kotrackusa.com/fckedit_file/file///20210908_3_35_9.pdf
    • https://brunoamaranti.it/wp-content/plugins/super-forms/uploads/php/files/1hnino7rig975d5goq4bo1qjr6/887824076.pdf
    • http://phunphu.com/userfiles/file/zabutevelotuku.pdf
    • https://shen-su.eu/gfx/userfiles/files/12423950778.pdf
    • http://hwayinn.com/image/files/20210917_140925.pdf
    • http://nuovartea.eu/userfiles/files/82763591000.pdf
    • http://mediaworld.pro/ckfinder/userfiles/files/lexafadoweto.pdf
    • http://cu-mbc.com/ckfinder/userfiles/files/48419747067.pdf
    • https://lenaoyunlar.com/calisma2/files/uploads/rafofozoledarig.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_off00022a2c.bin
064d22312af97851ef539d316b98f1f5fb8e9c23cb12ed5338cb4372b7efb211		 pdf-font-stream PDF embedded font (sfnt) at offset 0x22A2C 10888 bytes
font_01_sfnt_off0002431e.bin
149e1d9bcb3c5abe5d8d2d64677d61a3edb1c00660be70842437e9459335d767		 pdf-font-stream PDF embedded font (sfnt) at offset 0x2431E 20476 bytes
font_02_sfnt_off00027841.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x27841 16792 bytes

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