Malicious PDF — malware analysis report

Static analysis result for SHA-256 de2b65a29aee1357…

MALICIOUS

PDF

81.9 KB Created: 2021-09-08 22:55:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: df52ebf05af449da14a401645764bef2 SHA-1: a96903ab4fd8e62edb8ab257b7b08af9b08bdb24 SHA-256: de2b65a29aee1357a9b080f6af272e2cd66e6df93830bd2baac67c034fdb1e6c
166 Risk Score

Malware Insights

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

The PDF document employs a social engineering tactic, presenting a lure to install a browser extension or update to view content. This is a common method for delivering malware or stealing credentials. The presence of numerous external URLs, many pointing to PDF files, suggests a link farm designed to host and distribute malicious payloads. ClamAV detection and ML classification further confirm its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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.
  • 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://inwebjor.ru/uplcv?utm_term=dolphin+zero+apk PDF link annotation
    • http://architettobotteonpierpaolostudioabacus.it/userfiles/files/xavukoperetajizukabezegaf.pdfIn PDF document text
    • http://beastyenergy.com/userfiles/file/17827778079.pdfIn PDF document text
    • http://oguzlarotomatiksanziman.com/depo/sayfaresim/file/67588897789.pdfIn PDF document text
    • https://servingltda.com/userfiles/file/86141751230.pdfIn PDF document text
    • https://semot.com/Store/userfiles/file/48553080063.pdfIn PDF document text
    • https://acrgroup.nl/userfiles/file/22356927654.pdfIn PDF document text
    • http://poketomecam.com/uploads/files/69946807871.pdfIn PDF document text
    • http://irinabailey.com/upload/files/72451774261.pdfIn PDF document text
    • https://rabudiagnostic.com/userfiles/files/4200126826.pdfIn PDF document text
    • https://jetaime-shop.com/files/91675299171.pdfIn PDF document text
    • https://www.pal-kont.hu/wp-content/plugins/super-forms/uploads/php/files/78a19a677484acc865335bbc564319c4/32806810383.pdfIn PDF document text
    • http://formpart.com/upload/ckfinder/files/7402242954.pdfIn PDF document text
    • http://businessnavigator.in/ckeditor/uploads/files/pugiwevijuwabakemeg.pdfIn PDF document text
    • https://360clothing.indicsys.com/home/www360cl/public_html/uploads/images/files/14146869311.pdfIn PDF document text
    • http://www.stadion-zarya.ru/ckfinder/userfiles/files/gajepuwogipopoloniletadi.pdfIn PDF document text
    • http://prinsart.ro/uploads/files/87413833298.pdfIn PDF document text
    • https://ddmmaze.altruistictech.org/documents/img/upload/files/4541017377.pdfIn PDF document text
    • http://www.sm.ac.th/ckfinder/userfiles/files/84250596674.pdfIn PDF document text
    • https://egyseg.eu/ckfinder/userfiles/files/puvabika.pdfIn PDF document text
    • https://mamap.in/ci/userfiles/files/59868453308.pdfIn PDF document text
    • https://ipssecurityconsultants.com/ckfinder/userfiles/files/viziranomezivijatigudut.pdfIn PDF document text
    • https://kingyao.com/uploadfiles/files/20210831_230306_1954.pdfIn PDF document text
    • https://taperagi.com/contents/files/fiwerukufilek.pdfIn PDF document text
    • http://euredit-editions.com/userfiles/file/40017371720.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_off0000d950.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD950 10236 bytes
SHA-256: 49ccbb816406a0a1584eef2966eb9403de32b4112d975225178a1c080b604201
font_01_sfnt_off0000f02f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF02F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010841.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10841 18980 bytes
SHA-256: 9bd2a202f3c4c3c42fe9c4a9746ec63980d0a5ee6593c3803c63be03ae0fc7ff