Malicious PDF — malware analysis report

Static analysis result for SHA-256 b449cb83fb236dc9…

MALICIOUS

PDF

70.6 KB Created: 2021-09-16 10:32:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 455230963bbd02cc1c56b31bc6033c1b SHA-1: b023ec6b75ce7a0fd312177ffaca10940708be6d SHA-256: b449cb83fb236dc9dda3e8e5ff752d05d4d6d5c7100a12089a1459037619b95e
124 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The sample is a PDF file identified as malicious by ClamAV and an ML classifier. It contains numerous embedded URLs pointing to external domains, suggesting a phishing or redirection scheme. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a high volume of links on disposable hosting, further supporting a malicious intent to distribute or redirect users. No scripts were extracted, but the presence of many external links implies an attack pattern focused on luring users away from the document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.5249

Heuristics 4

  • 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
  • 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://ketchas.ru/uplcv?utm_term=3d+design+tools
    • http://xn--e42bt3l.net/upfile/files/vutataposoxagunemu.pdf
    • https://coevent.ru/upload/files/bovosivugenageluwutakipi.pdf
    • https://luckysurface.itweald.com/uploads/files/612fee55e1e87.pdf
    • http://maschimaurizio.it/userfiles/files/86678616075.pdf
    • http://maybomnuocdanang.com/uploads/image/files/mixad.pdf
    • http://medianet2000.net/amm_prod/image_news_popup/file/gelivepidaniduju.pdf
    • http://adams-gold.ru/archive/image/file/56707097328.pdf
    • https://dehayemek.net/upload/ckfinder/files/78286972602.pdf
    • http://4yoga.by/pics/files/gosulakawopajuxuguwilom.pdf
    • http://antonioruizabogados.es/userfiles/file/26783636069.pdf
    • http://dh-life.com/ckfinder/userfiles/files/91351261633.pdf
    • http://progettarecasa.com/userfiles/files/908033327.pdf
    • https://stvietnam.net/luutru/files/91941776986.pdf
    • https://esterkins.de/ckfinder/userfiles/files/lekisofuju.pdf
    • http://kanoonkaraj.ir/dbmanager/filebank/htmlgallery/file///50008472279.pdf
    • http://kidneytracker.com/ckfinder/userfiles/files/99894788147.pdf
    • https://psychotherapie-dr-albrecht.de/wp-content/plugins/formcraft/file-upload/server/content/files/16136c4d6365b6---47327242334.pdf
    • http://budapesticukraszdak.hu/userfiles/files/xununorujav.pdf
    • http://alvasari.com/wp-content/plugins/formcraft/file-upload/server/content/files/161312cc72dd20---lidojowepenat.pdf
    • https://pieseautocomenzi.ro/userfiles/file/sitenev.pdf
    • http://radissonhoteltraining.com/userfiles/file/pebesugazopasutawolov.pdf
    • http://speckrepej.com/upload/file/vojurerumudapefuvos.pdf
    • https://groupburuemas2.com/contents/files/vezegekukixusamoko.pdf
    • http://lamorenj.com/userfiles/files/62961453834.pdf
    • http://ctm.it/userfiles/file/pabuluxubikupofepolino.pdf
    • http://aktifimmo.lu/userfiles/files/50350623631.pdf
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d02b.bin
45e4b18912c0ddc93f6bec6ef6ab335cfa2ec9b18d69b6b743ba9e984f04cb26		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD02B 17412 bytes
font_01_sfnt_off0000fd15.bin
72755bada68e1b689da7f37c1aa17e4de515ad1149f4d7d8ba57854e233b7cd3		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFD15 10236 bytes

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