Malicious PDF — malware analysis report

Static analysis result for SHA-256 2d8c2fe5e8531514…

MALICIOUS

PDF

80.7 KB Created: 2021-09-09 22:23:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 4b0d6ebf650e7964ec63baa69c43d748 SHA-1: d570142c9b1785e0ef0cce38a6552cbfe1ba3ab9 SHA-256: 2d8c2fe5e85315149b7449655891f15c08ad2a8065297233a73721adbed1fca3
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a high number of external URIs, many of which point to potentially disposable domains. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or distributing further malware. The embedded JavaScript is a common technique for exploiting PDF vulnerabilities or redirecting users.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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 http://www.museopizarra.com/ckfinder/userfiles/files/xewulodefu.pdf In PDF document text
    • http://terremeraude.com/userfiles/file/juwilisiwejopopuponumexok.pdfIn PDF document text
    • https://leganordavigliana.it/uploads/file/42237573272.pdfIn PDF document text
    • https://i-chat.tw/js/ckfinder/userfiles/files/kibosu.pdfIn PDF document text
    • https://fultoys.com/userfiles/11467224034.pdfIn PDF document text
    • http://alpes-de-haute-provence.proximeo.com/ckfinder/userfiles/files/98074455114.pdfIn PDF document text
    • http://aan.kz/ckfinder/userfiles/files/80634224443.pdfIn PDF document text
    • http://bikaji.zohukum.com/ckfinder/userfiles/files/233268405.pdfIn PDF document text
    • https://marblobaths.com/app/webroot/img/files/87688975050.pdfIn PDF document text
    • http://egyptlance.com/userfiles/file/zigosu.pdfIn PDF document text
    • https://simpangkanan.com/contents/files/radiruk.pdfIn PDF document text
    • http://asdgolfclubtoscana.com/writable/public/userfiles/file/lerudojek.pdfIn PDF document text
    • https://vipbeachhouse.com/uploads/editor/file/27121796232.pdfIn PDF document text
    • https://baruipur.org/ckfinder/userfiles/files/rasixunegunapazaleke.pdfIn PDF document text
    • https://www.myjamaicais.com/wp-content/plugins/super-forms/uploads/php/files/7cdd937cf2436e3d4678403e8de8c281/pukijupuzajomobesagefid.pdfIn PDF document text
    • https://actsonics.com/uploads/files/202109081655068609.pdfIn PDF document text
    • http://xhzhengli.com/upload/61604090114.pdfIn PDF document text
    • https://plentis.eu/ckfinder/userfiles/files/wovilaxanalafitev.pdfIn PDF document text
    • https://kiemtoandongnghi.com/public/plugins/ckfinder/userfiles/files/rokepazod.pdfIn PDF document text
    • https://jaurrieta.net/USERFILES_JAURRIETA/files/12972521394.pdfIn PDF document text
    • http://www.oteliapelsin.ru/ckfinder/userfiles/files/44675602988.pdfIn PDF document text
    • https://ceral.pl/ceral/pliki/file/vosenafekamezejuv.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=name+things+that+start+with+a+letter+gamePDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d6c6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6C6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000eed8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEED8 18052 bytes
SHA-256: 229f71bb115d51c21f926dfe9dac6b3e0229e75fe9a63c78da1caef042473ce7
font_02_sfnt_off00011db1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11DB1 10496 bytes
SHA-256: 80f7983512648706476324855efb5c99fad283f447d66f9947a3265f0764e7c9

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