Malicious PDF — malware analysis report

Static analysis result for SHA-256 59fe3f110c04f7e4…

MALICIOUS

PDF

69.9 KB Created: 2021-09-13 17:43:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 63dd94d1f7a0ba05ef570945f5f82c57 SHA-1: 270ae563e537c68f9430589fb30ed651173678db SHA-256: 59fe3f110c04f7e4d69cc107705c61e1d00ab768cc28775b112531dd4711a9e4
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many pointing to potentially malicious domains, and is flagged by ML classifiers and ClamAV as malicious. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a tactic to obscure the true destination by using many distinct, disposable hosts. While no scripts were explicitly extracted, the nature of the embedded URLs suggests a phishing or malware distribution attempt, aligning with Spearphishing Attachment.

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 http://uhy-th.com/image/upload/files/fagenaxaluf.pdf
    • https://zaindu.drogomedia.com/files/galeria/files/86240955834.pdf
    • http://alwaysshine.com/fileimage/file/zimezanepe.pdf
    • https://kme.pl/global/app/webroot/uploads/file/16309797315607.pdf
    • http://marcobernini.it/userfiles/files/76262333097.pdf
    • http://www.bc-arman.kz/ckfinder/userfiles/files/4999589724.pdf
    • http://huerural.com/uploads/image/files/bipinutupejomenida.pdf
    • http://essentielles-theater.de/UserFiles/File/7204532639.pdf
    • https://sandp-engineering.com/ckfinder/userfiles/files/kipitiwo.pdf
    • http://autoset66.ru/admin/ckfinder/userfiles/files/xadefiwefuvotasolaremik.pdf
    • http://pujcovnanaradi-tvarozna.cz/userfiles/files/97351613387.pdf
    • https://marsanz.pl/uploads/fck/file/gelusozasopobolosarefitus.pdf
    • http://www.dfdtrading.sk/ckfinder/userfiles/files/42385620537.pdf
    • http://windmill-bv.com/userfiles/files/resutoweneraxomojape.pdf
    • http://www.goataxiservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131cfbec5b86---migusujexomitiderelej.pdf
    • http://munnarteabungalows.com/userfiles/file/37448220433.pdf
    • http://velkoobchod-man.eu/ckfinder/userfiles/files/17936172035.pdf
    • https://trickapotisk.cz/webpagebuilder/ckfinder/userfiles/files/46200868043.pdf
    • http://oticonshop.com/ckfinder/userfiles/files/72913600075.pdf
    • https://home-consult.lu/userfiles/files/gasitemu.pdf
    • https://www.disbel.es/ckfinder/userfiles/files/bawipitim.pdf
    • http://portalinmobiliario24.com/uploades/fckeditorfile/15200830762.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=mobdro+app+firestick+not+working
    • https://rt9.rspo.org/ckfinder/userfiles/files/35103729893.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_off0000b35b.bin
2afe68e69d10285bde87b308b9c24ed1db12ffd189b1f8a084567b2941bdd53c		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB35B 11060 bytes
font_01_sfnt_off0000cce7.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCCE7 16792 bytes
font_02_sfnt_off0000e4f9.bin
3f573d2a16aa29a0ed76abbba58e2ecf92223b3b8e9bba96c39def2138945438		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE4F9 14780 bytes

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