Malicious PDF — malware analysis report

Static analysis result for SHA-256 c4526b3808bf53a2…

MALICIOUS

PDF

76.9 KB Created: 2021-10-01 13:57:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 360c1687f413d0f30d6af0cca4d21e26 SHA-1: 5ef092c84563d29534621fdde8d69542728e6fb8 SHA-256: c4526b3808bf53a22fd5febd11af3813bd7171da6d3d1b8631f5b7ea26916b08
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF document was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs pointing to various domains, many of which appear to be part of a link farm designed to obscure the ultimate destination. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic confirms this behavior, indicating a high likelihood of phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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://bringem.de/wp-content/plugins/super-forms/uploads/php/files/ba8c3634683fc75aecad72485da5e1f8/wixezow.pdf
    • https://asztromiskolc.hu/ckfinder/userfiles/files/dorajotarafasukosubiz.pdf
    • http://tayles.com/uploaded/rixubinirebikivilane.pdf
    • http://duepassidalcentro.it/userfiles/files/jatejitaguvizi.pdf
    • http://zbraneklapka.cz/ckfinder/userfiles/files/35472773887.pdf
    • https://longhungphat.org/Images_upload/files/72780554623.pdf
    • http://healhumanity.foundation/userfiles/file/voneguluxikenilagimotam.pdf
    • http://kimhoatra.com/upload/fckimagesfile/jutarudutojapudo.pdf
    • http://daeryuhealthcare.com/ckupload/files/68855713222.pdf
    • https://zaindu.drogomedia.com/files/galeria/files/vojoluzixulijagafa.pdf
    • http://unite-chem.cn/upload/files/58344595370.pdf
    • http://www.alex-vasilkov.ru/images/wisdom/file/15778922756.pdf
    • http://sanitaerprofi.ch/fckeditor/editor/images/file/nudej.pdf
    • http://topaslt.com/userfiles/file/joruxumonemuvaxufo.pdf
    • https://dazhonghua1688.com/ckfinder/userfiles/files/lomovidudenoxeginawopesi.pdf
    • http://myapartment.de/web/editor/files/zirulidizi.pdf
    • https://millvalley.com/wysiwygfiles/file/30142927835.pdf
    • https://morganmethod.tuesdaytrader.com/ci/userfiles/files/pinixipuxopudasetuliragoz.pdf
    • http://gzpropellers.com/uploadfile/files/fetujerifes.pdf
    • https://tranhtreo.com/images/ckeditor/files/6801944932.pdf
    • http://ichieh.tw/uploads/files/202109262213416134.pdf
    • http://nationshield.ae/userfiles/files/saxuli.pdf
    • http://floridare.ru/app/webroot/img/uploads/file/551308_kofaxukewiv.pdf
    • https://wodepcb.cn/uploadfiles/files/8658186373.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=whats+my+android+version
    • 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_off0000c0f2.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC0F2 16792 bytes
font_01_sfnt_off0000d904.bin
c6d2ace3b20aa8b30bc170fa84c07bd24ce441f1733619b1fdef38a0d05d382b		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD904 20504 bytes
font_02_sfnt_off00010e21.bin
845132f5425b825048327c3da5b9444e1ee267653d4712fdee7afd8920823e7c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10E21 10640 bytes

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