Malicious PDF — malware analysis report

Static analysis result for SHA-256 dafa90596ff916ea…

MALICIOUS

PDF

62.3 KB Created: 2021-10-02 18:51:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 58564d9d9b9ca86ef115c837c68dd590 SHA-1: 4ac9db0c59395fadeda9630c4fd1e1470065750f SHA-256: dafa90596ff916ea7ac89cf87d4009b6a705e132535c9f22388ff73bccd46f72
124 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The sample was identified as malicious by ClamAV and an ML classifier. It contains numerous embedded URLs, many of which point to disposable hosting and are structured as a link farm, a common tactic for phishing or distributing further malware. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic specifically flags this behavior.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7455

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://synerhu.ru/uplcv?utm_term=accounting+bookkeeping+service PDF link annotation
    • https://takarasushimn.com/userfiles/files/80165005498.pdfIn PDF document text
    • http://studiogallerani.it/userfiles/files/tewumewaxelojuruzotetati.pdfIn PDF document text
    • http://banglenhospital.com/UserFiles/File/73329867893.pdfIn PDF document text
    • http://reversetheclocknow.com/ckfinder/userfiles/files/37663517064.pdfIn PDF document text
    • http://infoguard.ru/content/file/9716247938.pdfIn PDF document text
    • http://evrokomplekt.ru/userfiles/file/34499894447.pdfIn PDF document text
    • http://fine-trading-knotwork.de/uploads/media/mafar.pdfIn PDF document text
    • https://polenhosting.com/calisma2/files/uploads/44384697994.pdfIn PDF document text
    • http://techcessgroups.com/userfiles/file/66779100411.pdfIn PDF document text
    • https://www.traitagri-solutions-alternatives.fr/ckfinder/userfiles/files/79199810005.pdfIn PDF document text
    • https://popcouncilinstitute.org/wp-content/plugins/super-forms/uploads/php/files/4fa40a4c77b9748546fe22793e1dcf0a/jimisovi.pdfIn PDF document text
    • https://transmar.biz/ckfinder/userfiles/files/10451042507.pdfIn PDF document text
    • http://vino-charlie.cz/userfiles/file/1285338083.pdfIn PDF document text
    • https://swotin.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614fe6870829c---pakekufebufikuzufozebo.pdfIn PDF document text
    • https://ctapigroup3.com/contents/files/48068500643.pdfIn PDF document text
    • https://www.psk.com.au/application/third_party/ckfinder/userfiles/files/daxoteludefasen.pdfIn PDF document text
    • http://yuc-fac.com/uploadfiles/20210918190403.pdfIn PDF document text
    • http://hoaiduc.edu.vn/ckfinder/userfiles/files/wilelobogevolalipopef.pdfIn PDF document text
    • http://talk200.com/admin/admin/uploadfiles/file/58675633371.pdfIn PDF document text
    • https://afritransport.com/app/webroot/files/file/25595629322.pdfIn PDF document text
    • http://internet-trade.eu/UserFiles/file/zoperuvutuwanavanogid.pdfIn PDF document text
    • https://chokysitohang.com/Uploads/userfiles/files/52971272665.pdfIn PDF document text
    • http://criollo-cocoa.com/userfiles/file/vofewolujov.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_off0000b45b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB45B 10720 bytes
SHA-256: e31675d753562baa271a40eb34c461e3bb3111ecb005c4e0b4297457e2adde8b
font_01_sfnt_off0000ccfc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCCFC 17744 bytes
SHA-256: c03d77cb22f773c9c455491bfdee6f39966d679d2276357df23dbe54ca8ec214

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