Malicious PDF — malware analysis report

Static analysis result for SHA-256 fb9059293ca4b0b7…

MALICIOUS

PDF

69.1 KB Created: 2021-10-02 14:32:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 6108aaf6c06af266b0cd9c63fc2bc22e SHA-1: 619d0ef2e01f22bb1afb30a935b713e57d32c750 SHA-256: fb9059293ca4b0b77eaeab8c08bb9206d77cdd44b8fd997089430634ad1a5a2c
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 redirects to external URLs, as suggested by the PDF_URI and PDF_SEO_DISPOSABLE_LINK_FARM heuristics, which are often used in phishing or malware delivery schemes.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://drukarnia-skawina.pl/app/webroot/media/files/lirupidomub.pdf
    • http://coytex.net/ckfinder/userfiles/files/kofejowogatafuf.pdf
    • http://kutscher-customs.de/gfx/userfiles/files/19048236747.pdf
    • http://csc028.com/userfiles/file/20210905032948_01w44k.pdf
    • https://astdubai.co/userfiles/files/84530631131.pdf
    • http://manuale.aziendasulweb.it/userfiles/files/gilixatigetusizokiketapa.pdf
    • http://plovdivweek.com/app/templates/js/ckfinder/userfiles/files/xoluzabofisolunenane.pdf
    • http://studioaeditecne.it/userfiles/file/vupudez.pdf
    • https://picinterior.com/ckfinder/userfiles/files/61563786138.pdf
    • https://nakipoglugroup.com/upload/ckfinder/files/79000736980.pdf
    • http://seanbittinger.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/dowiwikutizumiz.pdf
    • http://birdwatching.sk/media/file/50066350109.pdf
    • http://kukdae.com/files/fckeditor/file/gososet.pdf
    • http://dentalcenterstudio.it/userfiles/files/59472907184.pdf
    • https://apartmani-mestrovic-krk.hr/files/worivegozug.pdf
    • http://chargooshads.com/images/upload/files/fefidofabanajegiki.pdf
    • http://signauction.net/userfiles/file/91971925230.pdf
    • http://mynotary.ca/sites/all/sites/mynotary.ca/files/pedawidosikifijejakol.pdf
    • http://ambulatorioveterinariorigolon.eu/userfiles/files/navimedigajafusimakusax.pdf
    • http://bertrandetgastineaudesigners.com/userfiles/file/60433226106.pdf
    • http://www.findvoters.com/userfiles/file/nereludibamar.pdf
    • https://trade.inter-ural.ru/ckfinder/userfiles/files/3062597072.pdf
    • http://ifa-astrologie.de/userfiles/file/16911697409.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=luv+on+a+leash
    • 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_off0000aec4.bin
8a7b7eabbf4c642d32f1ea4edeb9252b93cd2e9e0892cefdf005c1ce9a391572		 pdf-font-stream PDF embedded font (sfnt) at offset 0xAEC4 16568 bytes
font_01_sfnt_off0000d93f.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD93F 16792 bytes
font_02_sfnt_off0000f156.bin
03a9b9725c894915c8936e28513e15b28d13ef3cc9cf3863eb2ba520bb2ccdf5		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF156 10040 bytes

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