Malicious PDF — malware analysis report

Static analysis result for SHA-256 f0608fb286b7be90…

MALICIOUS

PDF

81.1 KB Created: 2021-09-18 04:58:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 1e96631f23b2c02a7abeb23fd1c82a8d SHA-1: 846272e0a541563515db0bcc8747adaf90fe8e17 SHA-256: f0608fb286b7be9012d47762a7559130f60fdc362d45f708b5e51b88a13208d8
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates the document is designed to host numerous links on disposable domains, a common tactic for phishing or distributing further malware. While no scripts were explicitly extracted, the PDF structure and numerous embedded URLs suggest an attempt to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 5

  • 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
  • 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://robert-zauer.cz/userfiles/file/sotegaxewogagubunamega.pdf In PDF document text
    • https://purpleleafestatebuyers.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e4ec4231b8---bipofukogigejugidape.pdfIn PDF document text
    • http://business-plan-capalpha.eu/mbp/upload/images/images/upload/ckfinder/netokesesinuresis.pdfIn PDF document text
    • http://mamnonsaokhue.vn/app/webroot/files/ckfinder/files/fileritip.pdfIn PDF document text
    • http://mabo-meccanica.eu/userfiles/files/bubur.pdfIn PDF document text
    • https://marwaautorepair.com/nbloom/fckuploads/file/36765502707.pdfIn PDF document text
    • http://szzxwx.com/Upload/Upload/file/2021914130209727.pdfIn PDF document text
    • http://incomsistema.ru/ckfinder/userfiles/files/81050661266.pdfIn PDF document text
    • http://jinshi66.com/uploadfiles/files/43838064076.pdfIn PDF document text
    • http://ducnhua.com/upload/files/5967061635.pdfIn PDF document text
    • http://chinhsuasolieu.com/media/files/32453537585.pdfIn PDF document text
    • https://saigonservices.vn/images/uploads/files/bukotibaxawasixubejalar.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/16142afb50e246---32417399922.pdfIn PDF document text
    • http://papianiarch.it/userfiles/files/30004209374.pdfIn PDF document text
    • https://sklep-pinokio.pl/web/uploads/files/kobisufonodiw.pdfIn PDF document text
    • http://rafaelstore.ru/upload/files/46555107155.pdfIn PDF document text
    • http://thangmayedex.com/webroot/img/files/32625461153.pdfIn PDF document text
    • http://fcv-bo.org/data/fcv-bo/userfiles/file/66229878392.pdfIn PDF document text
    • http://www.eurosecurimed.com/ckfinder/userfiles/files/filarovefowexawola.pdfIn PDF document text
    • http://dichvutheapec.com/upload/FCK/file/duwukoveteporo.pdfIn PDF document text
    • http://archiw.bibliotekalesmierz.eu/img/upload/files/werozapavilerodirumorewo.pdfIn PDF document text
    • https://psg66.ru/admin/ckfinder/userfiles/files/befeganaxojiv.pdfIn PDF document text
    • https://clinicscrm.com/img/files/42221443817.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=ps2+iso+emulator+for+androidPDF 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_off0000ca6d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA6D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e284.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE284 10736 bytes
SHA-256: 81a9cf1b584d2899b604505609ab9318b5b6dd847a5f2ff4490d8dc8070f3d7e
font_02_sfnt_off0000fb3e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB3E 23112 bytes
SHA-256: 848c0a13e4f68f7e15b766b30dc3c187b3f7b9af97631000f7132e61928e3eaf