Malicious PDF — malware analysis report

Static analysis result for SHA-256 b62083ef250c2b86…

MALICIOUS

PDF

70.3 KB Created: 2021-09-27 02:19:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: b72db7fe60e67ef6048a28eaccbca860 SHA-1: 2481dc329d40e30eac5287e857c2ab9716e18278 SHA-256: b62083ef250c2b867e1f022bbe39a068c917eeedca2806cbb86e69d0e89c9585
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, a common technique for executing malicious code within documents. The ML classifier and ClamAV detection strongly indicate malicious intent. The embedded JavaScript likely facilitates the redirection to external URLs, as suggested by the PDF_URI and PDF_SEO_DISPOSABLE_LINK_FARM heuristics, which are often used in phishing or malware distribution schemes.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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://duonglaohanoi.com/userfiles/file/balozunevudokavipodeviv.pdf
    • http://hbaoge.com/upload/files/xujubofozuduxorotamexa.pdf
    • http://thingsantiquesla.com/userfiles/files/lerovefopujizagonu.pdf
    • http://rama-sp.com/rama/webroot/js/ckfinder/userfiles/files/98744658565.pdf
    • http://edv-denk.com/userfiles/file/toguvonavamivuxo.pdf
    • http://4els.ru/uploads/images/files/xebejava.pdf
    • http://anthonyjcincottalaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/45849138119.pdf
    • http://thebeautyofdesign.nl/ckfinder/userfiles/files/kuwonofezelusi.pdf
    • http://katachizu.com/img/news/files/29329651560.pdf
    • https://adasms.fr/userfiles/file/8777293304.pdf
    • http://cableesmaltado.com/d/files/33660817677.pdf
    • http://xn----7sbakif2a3azdub.xn--p1ai/admin/ckfinder/userfiles/files/jirekamibogudozi.pdf
    • http://lussoleathertiles.com/test4/EDITOR/example/v2/userfiles/file/22664787763.pdf
    • https://bbensonmft.com/wp-content/plugins/super-forms/uploads/php/files/e874ea1eac393a8fab07a9c5c42e00ba/wafimirevaxevusuji.pdf
    • http://epplast.com/files/file/85568050673.pdf
    • http://suamanhinhlcd.net/userfiles/file/79512715176.pdf
    • https://gtnet-engine.com/ckfinder/userfiles/files/67047314306.pdf
    • https://tndvn.com/js/ckfinder/userfiles/files/35741796908.pdf
    • https://casasholidays.com/scgtest/team-explore/uploads/files/nusofijobuwaputudizam.pdf
    • https://pellevah.com/upload/files/19729112325.pdf
    • https://designclarf.it/file/46969218244.pdf
    • http://getrade.net/uploadfiles/file/15130897357.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=kodi+19+addons+march+2021
    • 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_off0000b07f.bin
283811a69c3960dc3de139c3f0eed3c2dfbf662abc932d85097fd18bc0f6ec69		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB07F 10812 bytes
font_01_sfnt_off0000c94c.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC94C 16792 bytes
font_02_sfnt_off0000e15e.bin
94f228268624a5dacf8a4b20014388096329ad05280802c9cd963e4676469d29		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE15E 16144 bytes

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