Malicious PDF — malware analysis report

Static analysis result for SHA-256 802ec300c5ed24aa…

MALICIOUS

PDF

77.1 KB Created: 2021-09-19 12:18:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 93e4eaa0f666f86fd27e0e54ff526dcc SHA-1: 32ce46d266d6f2c0cd8177a6107888cbc305ed6d SHA-256: 802ec300c5ed24aa1b98d5be25bc8908ce3a578c15590535e16affad0790dba7
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The sample is a PDF file flagged by ClamAV and an ML classifier as malicious. It contains numerous embedded URLs, many of which point to disposable domains, suggesting a link farm or phishing lure. The heuristic PDF_SEO_DISPOSABLE_LINK_FARM specifically indicates a non-clustered link farm on disposable hosting, reinforcing the phishing or malicious redirection intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://edarky.net/data/file/petapabukeragaralibizafi.pdf
    • http://veoguidecostarica.com/ci/userfiles/files/vomisorul.pdf
    • https://dentalrud.com/userfiles/file/xajivojivomepasodunit.pdf
    • http://juditphotography.com/picture/userfiles/file/89356062945.pdf
    • http://baschin-heizung.com/meineBilderAlbertGrundschule/file/vufopologux.pdf
    • https://karpataljaturizmus.hu/upload/tadutamovunudupulix.pdf
    • http://ccshecea.org/upload/files/29373844407.pdf
    • http://tageedesign.com/ssmpt/documents/file/44373390149.pdf
    • https://activepymes.com/pub/file/mupominunorajevalofug.pdf
    • http://dental-forum.ru/userfiles/file/6803045253.pdf
    • http://benetalent.com/upload/files/81623187050.pdf
    • https://gulertrafik.com/wp-content/plugins/super-forms/uploads/php/files/rbar6hvk172180uhr40h2083p0/22102973415.pdf
    • http://provia-events.de/pics/fotos/1/file/88612383277.pdf
    • http://moveisgarciadigital.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613540d226835---20881799332.pdf
    • https://globaldreamindia.com/webcms/file/2764787042.pdf
    • https://somogyplusz.hu/files/gigametesosofapikemu.pdf
    • http://boxethai38.com/upload/file/wexosab.pdf
    • http://embeddedhr.com/ckfinder/userfiles/files/rufuvekogijaju.pdf
    • http://belean.pl/userfiles/file/saxosujoxuzupadode.pdf
    • https://clubsecurite.fr/webroot/upload/files/resenigelekidad.pdf
    • http://mail-ex.net/userfiles/file/makal.pdf
    • http://bkdesign.ee/userfiles/file/32151381051.pdf
    • http://runhouchem.com/upload/files/96824243624.pdf
    • http://burragebrothers.org/demo/jolie/beta/userfiles/files/nebat.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=vector+calculus+spiegel+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_off0000ca1a.bin
34b87c39718f11cace6ce6b22e117dee053d74e39ff5e6dd35582089bb0b0ede		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCA1A 16884 bytes
font_01_sfnt_off0000f588.bin
a9a1f064c02e954f9280f24c53172877ae14b7d91227d0a08874402e3fe90ef2		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF588 10760 bytes
font_02_sfnt_off00010e3d.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10E3D 16792 bytes

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