Malicious PDF — malware analysis report

Static analysis result for SHA-256 24041c316c7d7ccf…

MALICIOUS

PDF

84.7 KB Created: 2021-09-09 10:52:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 5e878f654eddcfa2b94acf62c0a75051 SHA-1: 4dab552d531e85f047dda37365ebbb33567785ba SHA-256: 24041c316c7d7ccfab165f44177e35274dc0066e66ccd887c633c2007a6f49d3
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ML and ClamAV as malicious, with heuristics indicating it functions as a link farm. The embedded URLs, despite some being marked benign, suggest an attempt to redirect users to potentially harmful content. No scripts were extracted, but the overall structure points to a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://reclameindex.nl/images/uploads/48250126245.pdf
    • https://free-spirit-city.eu/uploads/wysiwyg/files/botadojena.pdf
    • http://dataction.org/demo/dataction/media/53780707273.pdf
    • http://gintaras.cz/userfiles/file/kimewolifarudomamuwat.pdf
    • https://www.eecpowerindia.com/codelibrary/ckeditor/ckfinder/userfiles/files/55818159930.pdf
    • https://www.hermanosvalerorecio.com/ckfinder/userfiles/files/korid.pdf
    • https://zlato-stribro-investice.com/upload/files/72526785795.pdf
    • http://doanekeyes.com/userfiles/docs/86489631909.pdf
    • http://pastadimatteo.com/ckfinder/userfiles/files/tolopaxexoli.pdf
    • http://stsaischoolamritsar.com/slbdavbatala/userfiles/file/40209177545.pdf
    • http://tolaniprojects.com/userfiles/file/9535885980.pdf
    • https://nuregio.de/wp-content/plugins/formcraft/file-upload/server/content/files/161386d8a87d58---105604958.pdf
    • http://alfatreyd-mebel.ru/archive/images/file/redifezezojetagof.pdf
    • http://uleshuzatshop.hu/files/file/pesomiziled.pdf
    • https://thietbivesinhanhhuy.com/asset/files/89761210847.pdf
    • https://www.toptalentusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135114ae2618---90281968518.pdf
    • http://npcbalkan.net/ckeditor/ckfinder/userfiles/files/dujafosalafowobelujewi.pdf
    • https://csmgh.net/pevron/www/img/file/dutawusowifazadeterexax.pdf
    • http://koszyczarek.pl/userfiles/file/13278216848.pdf
    • http://northcity.rs/slike/files/vawawoxobevurisu.pdf
    • https://futurefacesnyc.com/uploads/file/69205628606.pdf
    • http://fine-cottage.ru/userfiles/file/85899518825.pdf
    • http://www.ddu-hk.cz/ckfinder/userfiles/files/56893463767.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=p+read+only+memory
    • 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_off0000e80e.bin
3970534a24e3936a13d1966c6fef001fb6eb16a1ccda5a68e6c6d2a856b81f11		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE80E 10168 bytes
font_01_sfnt_off0000feb9.bin
9a7256f8494c175b62f09eec592c8eeefd24fd63de9339677375d10b47fb4086		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFEB9 17916 bytes
font_02_sfnt_off00012d34.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12D34 16792 bytes

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