Malicious PDF — malware analysis report

Static analysis result for SHA-256 1495a19dae0eabb1…

MALICIOUS

PDF

85.4 KB Created: 2021-09-18 05:52:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: 6b670092135e26dfa9f4ec474832fb5c SHA-1: eb745eec1ec36b9c669efd6aa324b2a26ae247e0 SHA-256: 1495a19dae0eabb1bfa04c2fe35c02ae36d8cf29fe6441b5ad332c1c75ea86c3
174 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution T1059.007 JavaScript

The PDF contains embedded JavaScript and numerous external URIs, many of which are part of a link farm on disposable hosting. The heuristic 'SE_BROWSER_INSTALL_LURE' indicates the document attempts to trick the user into installing a fake browser extension or update. This, combined with the ML classifier and ClamAV detection, strongly suggests a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Browser extension / update installation lure high SE_BROWSER_INSTALL_LURE
    Document tells the user to install a browser extension, plugin, viewer, or browser update to view content — a common social-engineering path for credential theft and malware installation
  • 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
  • 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 https://pixomot.ru/uplcv?utm_term=how+to+download+apk+files+for+free PDF link annotation
    • http://pixel-pro.ru/upload/file/72063160173.pdfIn PDF document text
    • https://degardo.hollandpazsit.hu/ckfinder/userfiles/files/zudexotobijizodilaj.pdfIn PDF document text
    • http://beta-rc.com/upload/files/53129887211.pdfIn PDF document text
    • https://heart-calligraphy.com/uploads/files/202109032256431098.pdfIn PDF document text
    • http://potlista.com/file/files/95897119214.pdfIn PDF document text
    • https://koncnc.com/genelresimler/file/45054436382.pdfIn PDF document text
    • http://snieznik.pl/userfiles/file/jadepaxogurexebemokesuzuk.pdfIn PDF document text
    • http://dentistturkey.com/image/files/tamilabatufamanotozi.pdfIn PDF document text
    • https://totalsewa.com/userfiles/file/7347225280.pdfIn PDF document text
    • http://ventiliatoriai.lt/js/ckfinder/userfiles/files/waxaluzujezew.pdfIn PDF document text
    • http://qapoll.com/2015/vat/upload/files/nuzosezawakeg.pdfIn PDF document text
    • http://toyotaquangninh.org/data/dulieu/files/93129684437.pdfIn PDF document text
    • http://mineraux-et-lithotherapie.fr/ckeditor/upload/files/ninimuravuzuporavila.pdfIn PDF document text
    • http://musicpark-live.de/userfiles/file/megapifunawukogebalaj.pdfIn PDF document text
    • http://nbnjl.com/userfiles/files/33634585890.pdfIn PDF document text
    • http://cmuniontravel.com/userfiles/files/xopoman.pdfIn PDF document text
    • https://homestayhoian.thamtuddt.com/uploads/image/files/79229951849.pdfIn PDF document text
    • http://ganteltechnology.com/system/userfiles/file/7857533235.pdfIn PDF document text
    • http://olimpic.hu/ckfinder/userfiles/files/delidiwixo.pdfIn PDF document text
    • https://360clothing.in/home/www360cl/public_html/uploads/images/files/50247493688.pdfIn PDF document text
    • https://mediaskills.rs/files/14545171127.pdfIn PDF document text
    • http://x04ydivan.ru/userfiles/file/71325824506.pdfIn PDF document text
    • http://beijingteye.com/upload/files/fepotodefelaxusape.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e7fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7FC 18088 bytes
SHA-256: 95c6d70c0805d6312674f82883529bed9563913ddadd338925dc66fa56b6c79e
font_01_sfnt_off0001170c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1170C 10660 bytes
SHA-256: 5353f66465bdb45ac4993571ebb6f2a7114a514e24259be56924f0d24bf865b6
font_02_sfnt_off00012f98.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12F98 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1