Malicious PDF — malware analysis report

Static analysis result for SHA-256 6b663b3b95eda8d6…

MALICIOUS

PDF

81.1 KB Created: 2021-09-10 10:38:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: dc41bd6dd745f7607d8e9a9a03152fb3 SHA-1: b08159b72fb72be996376918d9f5846eb825407b SHA-256: 6b663b3b95eda8d6a600ee7b4a1716c416f147aa6e2034d074768b9edb67949d
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many of which point to domains that appear to be part of a link farm designed to obscure the final destination. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly suggests a malicious intent to redirect users, likely for phishing or malware delivery. Although no scripts were explicitly extracted, the nature of the embedded URLs and the link farm heuristic indicate an attempt to exploit users via redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

Heuristics 5

  • 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.
  • 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://franciscovalles.comtraining.cl/userfiles/files/31285814087.pdf
    • http://alexandersorokolaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/44632584590.pdf
    • http://www.plain-pied.com/editeur/ckfinder/userfiles/files/solagowiborajazegabad.pdf
    • https://fotofidelity.cz/userfiles/file/87888838864.pdf
    • https://baatco.com/ckfinder/userfiles/files/46677772108.pdf
    • http://twgo8.com/uploads/base/files/202109011043139582.pdf
    • http://innotack.com/userfiles/file/fawawada.pdf
    • http://rc-modeller.se/images/file///10503356960.pdf
    • http://huzatfokozo.hu/editor_up/sadikeduw.pdf
    • http://synagoge-stommeln.de/ckfinder/userfiles/files/xatulosabeku.pdf
    • http://reanda.com/jingkelun/userfiles/files/20210908023424.pdf
    • http://madurastones.com/userfiles/file/73556461331.pdf
    • http://yuli-china.ru/d/files/28774439425.pdf
    • https://congchungnguyenlieu.vnpec.xyz/uploads/files/xanezenagedusena.pdf
    • https://baruipur.org/ckfinder/userfiles/files/82510068481.pdf
    • http://ominocoibaffi.it/userfiles/files/89593548088.pdf
    • http://deccanquest.com/konadnew/userfiles/file/40917456671.pdf
    • http://morebricks.com/ckfinder/userfiles/files/18898733790.pdf
    • https://implantologie-deva.ro/app/webroot/files/userfiles/files/torokejapinome.pdf
    • https://prestinieurope.ch/userfiles/files/xofudifokojiludokola.pdf
    • http://sotel-perm.ru/site/file/26508299951.pdf
    • http://www.mbk-montage.nl/ckfinder/userfiles/files/48571646929.pdf
    • http://abwrva.com/uploads/files/88886570832.pdf
    • http://myepres.com/HotelEstimator/userfiles/file/50818641638.pdf
    • http://thanhlamresort.vn/wp-content/plugins/formcraft/file-upload/server/content/files/1612ef12f1428f---jikufadutefof.pdf
    • http://aadcnfgl.netsociality.com/upload/files/35067660911.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=what+makes+clothes+designer
    • 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_off0000dad2.bin
7516ee136656991d7d93af054e4b2fee9e8ad018648d51da5fe479e6231ca1e5		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDAD2 16664 bytes
font_01_sfnt_off00010613.bin
eed2b6b1e078bfb48953535d4299d966ee8064fddabc3dd40ca3da70d7a4c10c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10613 10904 bytes
font_02_sfnt_off00011ee7.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11EE7 16792 bytes

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