Malicious PDF — malware analysis report

Static analysis result for SHA-256 5a483a593e003ea0…

MALICIOUS

PDF

85.8 KB Created: 2021-09-19 14:58:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 3c36c1ea6b48b638ff74baafed3ea292 SHA-1: f1731a5e93e21673b45ada4a5736f2a6de5d6fc8 SHA-256: 5a483a593e003ea094b2915c54cc91d32a43795f466d13bef1fbe7032cd8a9c1
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, with one heuristic specifically identifying a link farm on disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing a second-stage payload. The document body is unreadable, but the heuristics and numerous unknown-reputation URLs point to a malicious lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

Heuristics 5

  • 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
  • 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 http://hatdesechia.com/storage/ckfinder/files/mosaxekuvewerimixejumerem.pdf In PDF document text
    • http://plusbateria.com/wp-content/plugins/formcraft/file-upload/server/content/files/161354244cab5e---18889603304.pdfIn PDF document text
    • https://manajrgvaaradhi.com/cms-uploads/files/xomajifiwolitivaronegiz.pdfIn PDF document text
    • https://dentalrud.com/userfiles/file/50876189499.pdfIn PDF document text
    • http://caphegiabao.com/upload/fck/file/gifukazotorut.pdfIn PDF document text
    • https://akvaguru.hu/user/file/7466250676.pdfIn PDF document text
    • http://artattack-concerts.de/files/file/rovabagakow.pdfIn PDF document text
    • http://dietgame.net/admin/fckeditor/data/file/20210905162508.pdfIn PDF document text
    • http://italiangreyhound.pl/img1/userfiles/file/kubazavixenu.pdfIn PDF document text
    • http://feach.ie/images/uploads/file/43300686379.pdfIn PDF document text
    • http://american-security-inc.com/assets/ckfinder/userfiles/files/37726768592.pdfIn PDF document text
    • https://alpinashop.rudy-ra.com/files/jepipejoden.pdfIn PDF document text
    • http://abpjseah.news-read.com/upload/files/40175471021.pdfIn PDF document text
    • http://hattrick-sports.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a3a5dbc0a6---81506452609.pdfIn PDF document text
    • https://magnanerie-cazilhac.com/userfiles/file/nafitox.pdfIn PDF document text
    • https://gibidesign.com/fckfiles/file/texavatagirobitalu.pdfIn PDF document text
    • https://www.abandassociates.com/ckfinder/userfiles/files/66745980798.pdfIn PDF document text
    • https://cfi-registration.amyhalter.com/buzzboxgift/img/userfiles/files/3743473557.pdfIn PDF document text
    • https://martan.es/cenavarra_userfiles/files/58558084692.pdfIn PDF document text
    • http://kite-surf.sk/files/2307540457.pdfIn PDF document text
    • http://foreverymuslim.net/home1/forevev3/public_html/foreverymuslim/upload/file/tazunosirowekiperudevapo.pdfIn PDF document text
    • https://iphone-odklep.si/vsebina/93252115640.pdfIn PDF document text
    • https://emotionalgift.youngzonejewelry.com/ckfinder/userfiles/files/93681849051.pdfIn PDF document text
    • http://gizmakina.com/depo/sayfaresim/file/56691828353.pdfIn PDF document text
    • http://rayer.cn/d/files/57450227631.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=the+anatomy+coloring+book+wynn+kapit+pdfPDF link annotation
    • 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_off0000e933.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE933 11296 bytes
SHA-256: 1b724811b8221c546c6e107e2e2e8eb6d748d8347d5f24c837348e72b3bc2c43
font_01_sfnt_off0001032e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1032E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011b40.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B40 17776 bytes
SHA-256: e8fd5ed1b92b6a25bc074b22bf7eb67e6297042576fcb319eed0d0f49b7715b3