Malicious PDF — malware analysis report

Static analysis result for SHA-256 e90f444d9d4108b2…

MALICIOUS

PDF

67.5 KB Created: 2021-09-21 05:58:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: f5b74a183b343fa6689c048ff0bba68a SHA-1: 370072c239f8de796ccaa4c9550cc3f3a14da8a6 SHA-256: e90f444d9d4108b2a5bcaeeb7125047a8c577d16ef4f2335be4c387aeb5f874b
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many of which are part of a link farm hosted on disposable domains, indicating a likely attempt to redirect users to malicious content. The presence of external URIs and the link farm heuristic strongly suggest a phishing or malware distribution vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://laborke.ru/uplcv?utm_term=the+pirate+caribbean+hunt+unlimited+money
    • http://blesk-stroy.ru/userfiles/files/ririfesevegifanuzider.pdf
    • http://www.luna1956.com/images/library/File/71573008902.pdf
    • http://tkhomedeco.com/assets/uploads/ckedit/files/20210910171808.pdf
    • http://scuderieverdina.it/scuderia/userfiles/file/pudefil.pdf
    • https://fisheaglesafaris.net/pics/user/file/82907072323.pdf
    • http://gyndoktors.de/ckfinder/userfiles/files/pigud.pdf
    • https://latgalesamatnieki.lv/files/file/lasuwi.pdf
    • http://dlabiura.kbo.pl/ckfinder/userfiles/files/90393976225.pdf
    • http://wx-test.com/upload/ckimg/files/202109110028152398.pdf
    • https://efficientinfocomm.com/ckfinder/userfiles/files/weborugotopufowa.pdf
    • http://boxshop.mn/userfiles/files/25026644128.pdf
    • http://www.gunyagder.org.tr/wp-content/plugins/super-forms/uploads/php/files/i5c9ofg0ko2b138kdv62lcmhs2/35494027673.pdf
    • http://polskienarty.pl/data/aktualnosci_imgs/file/koguda.pdf
    • http://ekotop.eu/userfiles/file/81825091848.pdf
    • http://pngroup.pl/ckfinder/userfiles/files/41633885761.pdf
    • http://travellerisland.com/files/nevelajoveniwegom.pdf
    • https://www.inkfactory.pk/wp-content/plugins/formcraft/file-upload/server/content/files/16133f2664996e---mimozumuporuvopeted.pdf
    • http://canavesiobruno-architetti.it/userfiles/files/25219234872.pdf
    • http://carzip.biz/files/uploads/files/87221902501.pdf
    • http://sendedianqi.com/upload_fck/file/2021-9-14/20210914165425498731.pdf
    • http://afro-safari.com/upload/files/kadow.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_off0000ab81.bin
07c688e4ed8db179b6a4f189ba383105cbe86d3f662668b41f5c2f4d4a1c03f4		 pdf-font-stream PDF embedded font (sfnt) at offset 0xAB81 14432 bytes
font_01_sfnt_off0000cfce.bin
201d46a5fad1ae280e3b1af1070fede48d203080af3246f7818fe1685f6bf7d3		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCFCE 10928 bytes
font_02_sfnt_off0000e8b5.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE8B5 16792 bytes

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