Malicious PDF — malware analysis report

Static analysis result for SHA-256 bfbc74b1106aa132…

MALICIOUS

PDF

69.5 KB Created: 2021-09-14 23:57:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: e8e7766e82be0ae4b816344cd2684bac SHA-1: 28e19945414fe99e31ea8926d8b5ff788dc92e99 SHA-256: bfbc74b1106aa13255352a2d37bf4616d910fce120e022db4c913415b9e18f40
126 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a high likelihood of malicious intent. It contains numerous external URIs, including one that appears to be a redirector with a 'utm_term' parameter, suggesting a phishing or malware distribution lure. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' further supports this by indicating the PDF is part of a link farm on disposable hosting, designed to obscure the true destination.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

Heuristics 5

  • 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
  • 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 https://pixomot.ru/uplcv?utm_term=jss2+mathematics+textbook+pdf
    • http://westernmaki.com/uploads/files/12983028081.pdf
    • https://ristovski.mk/public_html/upload/userfiles/file/gobukoxap.pdf
    • http://ibookingkr.com/FileData/ckfinder/files/20210903_281269BEAA3768FE.pdf
    • http://omatsuri.kr/data/userfiles/files/22334551338.pdf
    • http://nguoigiupviec99.com/webroot/img/files/73133247285.pdf
    • http://showpalmedical.com/userfiles/sisagok.pdf
    • http://zhjpharm.com/upload/files/34191143568.pdf
    • http://ladispensadicampagna.it/uploads/assets/file/80732021062.pdf
    • http://shamayachts.com/upload/file/zososegejudadupixozepefo.pdf
    • http://duet-czluchow.pl/userfiles/file/kawajoxosasuvu.pdf
    • http://www.gainerwindows.ca/wp-content/plugins/super-forms/uploads/php/files/8ia632tb88kf0950cl0ifgbft1/bawapuv.pdf
    • http://koyomisushi.com/uploads/files/juvew.pdf
    • https://hockeymro.ca/docs/file/zesovuj.pdf
    • http://superfasttv.com/uploads/files/fejidamibinepagipip.pdf
    • http://hoangminhphatkorea.com/webroot/img/files/lomekumekagibadedol.pdf
    • https://smshealthcareservices.com/ckfinder/userfiles/files/kenovebixizetusavamawibaj.pdf
    • http://travelshops.pl/userfiles/file/99397884942.pdf
    • http://noithatdangcap.vn/app/webroot/uploads/files/rusotumifozuxanadubiz.pdf
    • https://codecs.ro/images/file/dosopujolufabelejol.pdf
    • http://megatex-plast.ru/pub/file/ganibin.pdf
    • https://artesapanaderia.xyz/aym_image/files/78229097802.pdf
    • http://streathamtaxi.com/survey/userfiles/files/10517094991.pdf
    • http://travellerisland.com/files/nazij.pdf
    • 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_off0000b348.bin
f46e7961c3d71e8e7f998fe3a9cbd0ae15f7f87035d2bdf1c9b2dbc95ac2502e		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB348 14288 bytes
font_01_sfnt_off0000d69b.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD69B 16792 bytes
font_02_sfnt_off0000eeb2.bin
5a7d6211ec14a7e81b972485c86a93d6855666034444627113b48ce62c9a5cfa		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEEB2 11080 bytes

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