Malicious PDF — malware analysis report

Static analysis result for SHA-256 72185e18bc3fb4a6…

MALICIOUS

PDF

62.0 KB Created: 2021-09-23 02:53:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: e7243ca8d25c403b0845be2f2d0ec070 SHA-1: 78ca69cee0733dc46bd91fcebab6111f38c22df3 SHA-256: 72185e18bc3fb4a65b2f3dfc3e4de79f385887d883498f47e230273ccd2f963e
124 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains a large number of external links, many of which are hosted on disposable domains, suggesting a link farm or phishing operation. The presence of 'utm_term' parameters in some URLs further supports a phishing or malicious redirection scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.5277

Heuristics 4

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://crysiq.ru/uplcv?utm_term=watch+night+at+the+museum+free PDF link annotation
    • https://jecoexports.com/ckfinder/userfiles/files/14468827206.pdfIn PDF document text
    • http://rentappli.com/tinymce/jscripts/tiny_mce/plugins/phpimage/phpimage/upload/images/file/8954760035.pdfIn PDF document text
    • http://kangshi-you.com/uploads/files/202109230225327213.pdfIn PDF document text
    • http://cattaneoarchitetti.it/userfiles/files/29263139483.pdfIn PDF document text
    • http://nattuvaartha.com/assets/ckfinder/core/connector/php/uploads/files/44417731955.pdfIn PDF document text
    • http://interiorconsignments.com/media/file/lixetizululoxudapadujide.pdfIn PDF document text
    • https://ourcampuswindow.com/ckfinder/userfiles/files/3920401383.pdfIn PDF document text
    • http://iccjsc.vn/images/uploads/files/91360443827.pdfIn PDF document text
    • https://artgreen.vn/attachment/files/87675676663.pdfIn PDF document text
    • http://archi1919.com/smlclub-files/file/46362861306.pdfIn PDF document text
    • http://malir-naterac.info/UserFiles/File/91455449039.pdfIn PDF document text
    • http://xn----0tbbbfo0f.xn--p1ai/userfiles/file/15214699651.pdfIn PDF document text
    • http://logo4you.dk/userfiles/file/bazefuroxenefuno.pdfIn PDF document text
    • https://www.lamuccacompany.com/wp-content/plugins/super-forms/uploads/php/files/369ad4f1689a918f0146e9137d9b99a7/bimeto.pdfIn PDF document text
    • http://bibikid.ru/upload/60131074796.pdfIn PDF document text
    • https://baptistfriends.org/media/mubalumikomoxulel.pdfIn PDF document text
    • http://discoveryenglish.org/wp-content/plugins/formcraft/file-upload/server/content/files/1614b179e3668c---lisumukowuwake.pdfIn PDF document text
    • http://www.ecrivains-consult.fr/easyonline/ckfinder/userfiles/files/66988385810.pdfIn PDF document text
    • https://lolakarimova.uz/ckfinder/userfiles/files/96834310666.pdfIn PDF document text
    • http://scarpatti.com/files/41162437736.pdfIn PDF document text
    • http://fiumevivo.it/userfiles/files/93618562447.pdfIn PDF document text
    • http://allier.proximeo.com/ckfinder/userfiles/files/ruworixukajomikusupilodu.pdfIn PDF document text
    • http://www.smpnuenen.nl/images/files/17865294457.pdfIn PDF document text
    • http://www.britocunhaadvocacia.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/16135d27cbd280---kuruzafun.pdfIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000be55.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBE55 10712 bytes
SHA-256: 40de73d6dba88cf877099ec4796a96afa995d51945767d5bb3792a240ff22a2e
font_01_sfnt_off0000d6cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6CC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1