Malicious PDF — malware analysis report

Static analysis result for SHA-256 3fe8e128d3d5ec61…

MALICIOUS

PDF

70.3 KB Created: 2021-09-17 02:18:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: 0b56c7ac424277f0f1c59527e08aa3d8 SHA-1: 1e736597eb95a73115935213dfd869c39f756c8b SHA-256: 3fe8e128d3d5ec61b4e27b3bdca626e13a08e3b3540749eb2c07c8039d3358c5
124 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file contains numerous embedded URLs pointing to various domains, suggesting a link farm or phishing attempt. The 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic indicates a high likelihood of malicious intent, with many links on disposable hosting. ClamAV detection as 'Pdf.Phishing.Trojan' further supports this assessment. No scripts were extracted, but the structure and URL distribution are indicative of a malicious document designed to redirect users.

Machine Learning

  • Nyx PDF Classifier malicious score 0.6924

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://laborke.ru/uplcv?utm_term=kamasutra+kannada+translation+book PDF link annotation
    • http://leylatoprak.com/userfiles/file/53106800513.pdfIn PDF document text
    • https://elearning-chemistry.ro/userfiles/file/84993052123.pdfIn PDF document text
    • http://centromedicoveterinarioadda.com/userfiles/files/poxuxepinigomulivosule.pdfIn PDF document text
    • https://fertilizerproductionprocess.com/d/files/97630335724.pdfIn PDF document text
    • http://ljjxmining.com/uploadfile/file///2021091706164292.pdfIn PDF document text
    • http://asijskepotraviny.cz/files/file/31388410366.pdfIn PDF document text
    • https://kvgrup.com.ua/wp-content/plugins/formcraft/file-upload/server/content/files/16140e9075aaf6---39343637282.pdfIn PDF document text
    • https://adverto.ee/userfiles/file/pamezuzoma.pdfIn PDF document text
    • http://gonganmi.com/userfiles/file/29222821138.pdfIn PDF document text
    • http://digitalqwerty.com/ckfinder/userfiles/files/53304462142.pdfIn PDF document text
    • http://lor-rostov.su/userfiles/files/povonekemigopasokeme.pdfIn PDF document text
    • https://glass-haus.ru/wp-content/plugins/super-forms/uploads/php/files/c08367bd92cd2868b27d09d614b001ee/76809254554.pdfIn PDF document text
    • https://webbsoil.com/home/webb/public_html/ckfinder/userfiles/files/tuzulorafutenanabigigomut.pdfIn PDF document text
    • http://22vek-omsk.ru/fck_editor_files/files/gedafomer.pdfIn PDF document text
    • https://mexico-airport-transfers.com/ckfinder/userfiles/files/poponiv.pdfIn PDF document text
    • http://birizgardenhotel.com/userfiles/file/xaduwivodup.pdfIn PDF document text
    • https://postelezmasivu-olomouc.cz/ckfinder/userfiles/files/kizopepologumox.pdfIn PDF document text
    • http://affordableadobe.com/ckfinder/userfiles/files/2901827364.pdfIn PDF document text
    • https://zenithoverseas.com/assets/userfiles/files/27878842959.pdfIn PDF document text
    • http://meuble-tunisie.com/userfiles/file/3485341388.pdfIn PDF document text
    • https://bokaichenyu.com/upload/files/11330118754.pdfIn PDF document text
    • https://djecijagarderoba.me/userfiles/file/67108204224.pdfIn PDF document text
    • http://geose.ru/userfiles/file/31409115623.pdfIn PDF document text
    • https://mmrh.myagenda.cz/pictures/editor/files/65498130404.pdfIn PDF document text
    • http://autoklej.pl/app/webroot/media/files/66179368564.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_off0000d009.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD009 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e820.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE820 10600 bytes
SHA-256: 0aabd90cd8364cbcea4ef3747e3d4ffb8f5891cf1bdb22440784adafcbb73146