Malicious PDF — malware analysis report

Static analysis result for SHA-256 5f3ab2b69ed6ce20…

MALICIOUS

PDF

82.4 KB Created: 2021-09-09 21:07:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: caf3242eacb9a5641e8112c54bb4b02c SHA-1: 248d9b87cde69ddc22f72da5bf69610863aa73f1 SHA-256: 5f3ab2b69ed6ce205c206cb198049a0921cfc2a944ea2bb16f76328bbff43e81
174 Risk Score

Malware Insights

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

This PDF document was flagged by ML classifiers and ClamAV as malicious, exhibiting characteristics of a phishing and trojan delivery mechanism. The presence of a 'Browser install lure' heuristic indicates a social engineering attempt to trick the user into installing malicious software or extensions. The document also contains numerous external URIs, suggesting it may be part of a link farm designed to redirect users to malicious sites or download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://wastran.ru/uplcv?utm_term=change+google+profile+pic
    • https://jagamimpi.com/contents/files/kiwuzixirelarofo.pdf
    • https://jamiatulbanat.in/wp-content/plugins/formcraft/file-upload/server/content/files/16137f056c2347---68359289701.pdf
    • http://magnumprint.ru/upload/files/wowetaxafexozoduvo.pdf
    • http://st-johnson.com/Uploadfiles/files/gigifokovorugar.pdf
    • https://glaskunstcentrum.nl/images/file/fogezigijatiri.pdf
    • https://vnmmalta.com/userfiles/file/83355663353.pdf
    • http://haihengpharm.com/upload/files/filufulexejizopemexud.pdf
    • http://gibisch.info/files/files/wuruvor.pdf
    • https://kemxoithanhhang.vn/app/webroot/files/images/pages/files/gilugutudafimubirofun.pdf
    • https://www.champagne-cornevin.fr/ckfinder/userfiles/files/34179932794.pdf
    • http://geasit.it/userfiles/files/35328754500.pdf
    • http://www.heksan.com.pl/file/lipamelifogewolesil.pdf
    • http://chernogolovka.inhome360.ru/admin/ckfinder/userfiles/files/42662645525.pdf
    • https://inverpalmas.com/aym_image/files/34261553174.pdf
    • http://www.stockholmswingallstars.com/wp-content/plugins/formcraft/file-upload/server/content/files/161331089e4adf---26150521509.pdf
    • https://www.aicsmindia.org/ckfinder/userfiles/files/9412733319.pdf
    • https://phoenixturkey.com/upload/ckfinder/files/23182854190.pdf
    • http://maiodi.com/userfiles/files/xulawejudipajovuzi.pdf
    • https://aksusu.com/upload/files/83903109050.pdf
    • http://humanlitech.com/files/files/83982279839.pdf
    • https://ostrichpharmaceuticals.com/userfiles/file/93125953297.pdf
    • http://plechotice.sk/tmp/file/43911916759.pdf
    • http://falconartistmanagement.com/ckfinder/userfiles/files/25719815197.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000df07.bin
0bd05b3921688dc5b0ca8f7c4c7599719ff0ebe6a0ae38226715e90f4ce45aa9		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDF07 10524 bytes
font_01_sfnt_off0000f6e0.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF6E0 16792 bytes
font_02_sfnt_off00010ef2.bin
97983760102aece62014745d285012e6a914ea3b03d0980d6ad7fc27f7d2253b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10EF2 17384 bytes

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