Malicious PDF — malware analysis report

Static analysis result for SHA-256 e39c0348bc843812…

MALICIOUS

PDF

79.6 KB Created: 2021-10-06 01:15:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 97c69b42d52bee78d08285d1a906cf4d SHA-1: 69966220d5cdbec5b5c3bfb80be7e7a0898e2583 SHA-256: e39c0348bc84381217e24a3379f834bf4470376bd306ff7ed8724b5b5ed0876c
126 Risk Score

Malware Insights

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

The file was detected as malicious by ML classifiers and ClamAV, specifically identified as a phishing trojan. It contains numerous embedded URLs, many of which are part of a link farm hosted on disposable domains, indicating an attempt to obscure the final malicious destination. The PDF's structure and the presence of these links strongly suggest it's designed to lure users to external sites, likely for credential harvesting or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://krisoc.ru/uplcv?utm_term=electricity+generation+from+biogas+pdf
    • https://beldapromosyon.com/calisma2/files/uploads/32587792021.pdf
    • https://ohligschlaeger-berger.de/wp-content/plugins/formcraft/file-upload/server/content/files/1612eca7a10b5c---93968783857.pdf
    • http://emilymillerlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/dolulasazuniwavij.pdf
    • http://daliangluyinpeng.com/userfiles/file/bibenojawusigafinexa.pdf
    • https://lbjgold.in/ckfinder/userfiles/files/49839333834.pdf
    • http://zhouzhuank.com/v15/Upload/file/2021921412417134.pdf
    • http://metroboxservices.com/upload/ckimage/files/janarapixitirame.pdf
    • http://www.aunay-sous-auneau.fr/ckfinder/userfiles/files/toleko.pdf
    • http://gabortech.com/admin/file/pulas.pdf
    • http://unite-chem.cn/upload/files/zinelomonifoxi.pdf
    • http://nutrizionisti.eu/public/thread/risorse/file/sagafulidexewasapan.pdf
    • http://retrievers.su/ckfinder/userfiles/files/mevevenelegegoxenesiwaja.pdf
    • http://sportingfoundation.com/uploads/file/95237123291.pdf
    • http://buyyoutubelikes.com/ci/userfiles/files/20216880390.pdf
    • http://onmamtour.com/FileData/ckfinder/files/20210911_CBE7DCE53CF98A35.pdf
    • http://www.jobibon.com/admin/userfiles/file/97911290902.pdf
    • http://maihome.hu/admin1/file/65013203847.pdf
    • http://jjburgerut.com/uploads/files/17501144594.pdf
    • https://smartmedia.ro/app/webroot/files/userfiles/files/bifevumexukapobuwekarebal.pdf
    • http://hoshitorionline.com/uploads/files/bajuvaxizoxozerokupufuga.pdf
    • http://www.aamuhsv-madisonalumni.org/files/files/28061004954.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_off0000cf28.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCF28 16792 bytes
font_01_sfnt_off0000e73a.bin
fbf79b6a68b8a7fa87a8f884cfcb830b1c8a5208d36cc6f5d635b9109307f9b2		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE73A 18192 bytes
font_02_sfnt_off00011705.bin
e32b5a812142a02ef1b372e225cb890428dda351fd3781aa5434624d31c6ccc3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11705 11200 bytes

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