Malicious PDF — malware analysis report

Static analysis result for SHA-256 276d3a4c8878ee5f…

MALICIOUS

PDF

62.3 KB Created: 2021-09-18 08:34:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 8fede78603a21452d915cbfdb541b9d9 SHA-1: 6067c6187908b8517e488511ecd424f47b2846a5 SHA-256: 276d3a4c8878ee5f723966fa215d2ae63781b42969598af71f71bec20e47e68c
132 Risk Score

Malware Insights

MITRE ATT&CK
T1059.007 JavaScript T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, a common technique for executing malicious code. The ML classifier and ClamAV detection strongly indicate malicious intent. The embedded JavaScript likely redirects the user to one of the numerous external URLs found in the document, which are often used for phishing or to download further malware. The presence of many links and the 'utm_term' parameter in one URL suggests a lure to trick users into clicking.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7892

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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • External URI info PDF_URI
    PDF contains an external URL action
  • 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://hsound.ro/images/custom/file/5959550863.pdf
    • http://grabnerestriche.at/33097358044.pdf
    • https://52fantasies.com/home/holly/public_html/ckfinder/userfiles/files/muminaduzozejorolixi.pdf
    • https://hv2barrier.com/application/third_party/ckfinder/userfiles/files/99697815482.pdf
    • https://prtl.pl/userfiles/file/94501863692.pdf
    • http://kasargod.net/uploads/file/39648373951.pdf
    • http://cherriestattoo.com/ckfinder/userfiles/files/42154152020.pdf
    • http://sasmedm.com/www/js/ckfinder/userfiles/files/93006176093.pdf
    • http://deurwater.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614106ee44db8---52448528527.pdf
    • https://tannhatviet.vn/upload/files/59457940304.pdf
    • https://girisimhaber.com/uploads/file/lumokisipidejigano.pdf
    • https://dsverano.com/UserFiles/File/pugubas.pdf
    • http://conditum.nl/userfiles/file/92021198623.pdf
    • http://suarezbeltran.com/aym_images/files/9983729956.pdf
    • http://susasoft.com/upload/userfiles/files/75313156190.pdf
    • http://zerosquareonline.com/file/xafolulodomodadi.pdf
    • http://zit-tech.com/userfiles/files/96980854734.pdf
    • http://jamalcar.com/userfiles/file/13922863472.pdf
    • http://intertermo.nl/userfiles/file/jopixitozazedagadowetag.pdf
    • http://vallovin.it/userfiles/files/52231737164.pdf
    • https://www.mercato.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1613c6ac21904e---nisulor.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=hack+car+parking+apk
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d383.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xD383 16792 bytes