Malicious PDF — malware analysis report

Static analysis result for SHA-256 5a3ebe6d1afc345b…

MALICIOUS

PDF

62.4 KB Created: 2021-09-19 12:21:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-22
MD5: 625c48ef34c4633c250697687b343d53 SHA-1: a032c0a0fdebd18f9271b98f954b2899ddff7ae7 SHA-256: 5a3ebe6d1afc345bab15c3d6985581ffe7d1c7865523b9fe8f378c6a4d072d63
124 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to disposable domains, indicating a link farm designed to host malicious content or phishing pages. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and numerous external links are indicative of a phishing or malware distribution lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.6561

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://medvor.ru/uplcv?utm_term=using+itextsharp+in+c%23 PDF link annotation
    • http://kenshopvn.com/uploads/files/dubosoluxeru.pdfIn PDF document text
    • http://xinyaoqiye.com/upload_fck/file/2021-9-15/20210915205230595542.pdfIn PDF document text
    • http://all-paca.com/ckeditor/ckfinder/core/connector/php/uploads/files/pumoxosopijezoloxigige.pdfIn PDF document text
    • http://riskhedgetech.com/uploaded/file/279684854613783db11bd3.pdfIn PDF document text
    • https://szabolcsipeter.com/userfiles/file/gasogizidepanula.pdfIn PDF document text
    • http://eortak.com/img/fck_temp/file/12226258663.pdfIn PDF document text
    • http://wingmanresearch.com/userfiles/files/zeguboz.pdfIn PDF document text
    • http://retrolondontees.com/userfiles/file/zivivesez.pdfIn PDF document text
    • http://npi-management.org/ressource/site-image/files/20412990147.pdfIn PDF document text
    • http://kcpsystem.com/userData/board/file/femajobujekazifedewalorum.pdfIn PDF document text
    • http://kvarkeno56.ru/userfiles/file/sigesadenowa.pdfIn PDF document text
    • http://georgewongdesign.com/gwd/upload/files/59045038691.pdfIn PDF document text
    • http://xyr59.com/filespath/files/20210903234420.pdfIn PDF document text
    • https://loskutova.site/wp-content/plugins/super-forms/uploads/php/files/0194f490df20ca9e6594728c2728a8ff/vakarisibebaxa.pdfIn PDF document text
    • http://salt17.com/userfiles/files/65891012035.pdfIn PDF document text
    • http://on-video.com/movies/movie_data/file/30316749475.pdfIn PDF document text
    • http://training-solutions.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1613c744273509---97544288281.pdfIn PDF document text
    • https://istanbularicilikfestivali.com/upload/ckfinder/files/mawukeriruditu.pdfIn PDF document text
    • http://dermalab.pl/userfiles/file/26497018454.pdfIn PDF document text
    • https://sunnyrosesschool.com/userfiles/file/60935851502.pdfIn PDF document text
    • http://www.juniorcollege.cl/ckfinder/userfiles/files/9161822177.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_off0000b068.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB068 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c87f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC87F 10596 bytes
SHA-256: 480e23d2e217c31dca5084c74e703138ed87081a4a0550d026deb0f5f213af9a

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