Malicious PDF — malware analysis report

Static analysis result for SHA-256 1487c17c0242cb69…

MALICIOUS

PDF

81.8 KB Created: 2021-09-24 05:48:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 2cb63e2d35a3cc091d6e2d281261841a SHA-1: 08513bdf6c1c87eb22efc33d6196c2e7be32a3cd SHA-256: 1487c17c0242cb69b7b0b22ff22875f431bb412b2d05c9e85dfd7e9d81b85625
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which are hosted on disposable domains, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. The embedded JavaScript is likely responsible for executing the redirection or downloading additional payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://anquocrealty.com/uploads/image/files/22435033942.pdf
    • http://cuborh.com/natelinhanew/js/ckfinder/userfiles/files/89282006327.pdf
    • http://savalis.ru/userfiles/file/87014262273.pdf
    • http://moriefrusca.com/userfiles/files/42990545187.pdf
    • http://mictrogiang.com/userfiles/files/59632716374.pdf
    • http://embody.box8websites.com/ckfinder/userfiles/files/63001657368.pdf
    • https://soechi.com/userfiles/file/21452809512.pdf
    • https://altsovmun.ru/userfiles/file/muwumoxivubo.pdf
    • http://hamdannepal.com/userfiles/file/2904792862.pdf
    • https://nceptionsolutions.com/wp-content/plugins/super-forms/uploads/php/files/12fd719472aaac91d526a1553fd9b1b4/74876813357.pdf
    • http://seowonbattery.com/files/fckeditor/file/916298028614922d44b3d6.pdf
    • http://midesignvn.com/uploads/files/nunidel.pdf
    • https://redfortfireworks.com/ckfinder/userfiles/files/mogaruxewidurinav.pdf
    • http://fred-robin.com/ckfinder/userfiles/files/jikeva.pdf
    • http://www.biogreeno.com/cms/ckfinder/userfiles/files/13148167557.pdf
    • http://manuale.aziendasulweb.it/userfiles/files/pemogana.pdf
    • https://estduquebec.com/scripts/php/xenocode/lib/ckfinder/userfiles/files/nujidox.pdf
    • http://andrenickels.de/ckfinder/userfiles/files/67117245550.pdf
    • http://spostojow.pl/userfiles/file/losixawavizekus.pdf
    • https://ddshower.com/ckfinder/userfiles/files/sisotiwapokopipi.pdf
    • http://inimtrento.it/userfiles/files/79462658090.pdf
    • https://falconshipping-uae.com/userfiles/files/regilisiduraxa.pdf
    • http://cybernet-ap.com/UserFiles/File/47482345323.pdf
    • http://lavera.it/wp-content/plugins/formcraft/file-upload/server/content/files/1612eb54ae6736---wugonamewuzusamela.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=bluestacks+android+emulator+whatsapp
    • 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_off0000dc94.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDC94 16792 bytes
font_01_sfnt_off0000f4a6.bin
20a43d0bdef330bcee4eb0b969d5fd215c89c5e28bc07e8c1da3a8f61420ca70		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF4A6 16624 bytes
font_02_sfnt_off00011fc3.bin
58a550e2889760dd68d821756b440f4219b2fe6e176fc58cad130a99eaf3d52d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11FC3 11112 bytes

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