Malicious PDF — malware analysis report

Static analysis result for SHA-256 5b4b139c1af76b92…

MALICIOUS

PDF

85.3 KB Created: 2021-09-08 19:24:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: d725f2ba8f3cd78ddf8a90b9c360372f SHA-1: 3eec1f8eb7943779d10a978dc2ebb1780880f40f SHA-256: 5b4b139c1af76b9298cb7e6f8a6828294a4ea0eb9abf2e935ea3dd897928e664
124 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, and exhibits characteristics of a link farm PDF. It contains numerous external URIs pointing to various domains, suggesting an intent to redirect users to potentially malicious websites. The presence of PDF_SEO_DISPOSABLE_LINK_FARM heuristic indicates a pattern of hosting many links on disposable domains, a common tactic for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.6051

Heuristics 4

  • 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
  • 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://ketchas.ru/uplcv?utm_term=the+maximum+surveillance+society+pdf PDF link annotation
    • https://bitree.ru/ckfinder/userfiles/files/wivalafarodez.pdfIn PDF document text
    • http://coverybox.box8websites.com/ckfinder/userfiles/files/gafufiputesa.pdfIn PDF document text
    • http://iuoooo.com/filespath/files/20210901042809.pdfIn PDF document text
    • http://vino-charlie.cz/userfiles/file/wesetobilogak.pdfIn PDF document text
    • http://gewidor-gmbh.de/uploads/files/pogimeselonugofiz.pdfIn PDF document text
    • http://www.zywawiara.pl/pliki/fomadiwisitilufujusasate.pdfIn PDF document text
    • https://sfeerweter.nl/userfiles/files/fofitimetove.pdfIn PDF document text
    • http://video-cycling.de/files/file/pikeponozosesudo.pdfIn PDF document text
    • http://papaicountrylodge-longstay.com/user_img/files/punurogil.pdfIn PDF document text
    • https://dafelia.com/files/mojakonibakuperilebubapix.pdfIn PDF document text
    • https://retta-bg.com/userfiles/61462354694.pdfIn PDF document text
    • http://finalbrand.cz/upload/file/99470872113.pdfIn PDF document text
    • http://poketomecam.com/uploads/files/94385177646.pdfIn PDF document text
    • http://88cpap.com/userfiles/files/modosumukajazikotumobaj.pdfIn PDF document text
    • http://gulfcoastlist.com/userfiles/file/tifipenetapewilotabube.pdfIn PDF document text
    • https://www.dynasil.com/wp-content/plugins/super-forms/uploads/php/files/4938057f53aa8667c75d4e65f335ab65/nekukiwapoxomuge.pdfIn PDF document text
    • https://sunrise-photon.com/upfiles/editor/files/pexizurumig.pdfIn PDF document text
    • http://hometextiles-consultant.com/ckfinder/userfiles/files/81082313098.pdfIn PDF document text
    • https://www.wroclawmodelshow.pl/ckfinder/userfiles/files/tuburaxal.pdfIn PDF document text
    • https://halobysciton.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613064fea4a90---nowoxafabuguwawije.pdfIn PDF document text
    • http://epmresearch.org/userfiles/files/78944355749.pdfIn PDF document text
    • http://sage-chem.com/image/files/20210903_141316.pdfIn PDF document text
    • https://casabresciani.it/uploads/file/furilamupudumajema.pdfIn PDF document text
    • http://danchrisjewelry.com/userfiles/file/laruxukosajudebebatu.pdfIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00011d7f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D7F 11232 bytes
SHA-256: d473544ef97b77f92067895838c12da263ea568f58a41d22d0b8ad292ad4ccd2