Malicious PDF — malware analysis report

Static analysis result for SHA-256 9337aee286282981…

MALICIOUS

PDF

81.2 KB Created: 2021-09-11 19:51:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: d54ed8337a8e890460d6be31a76e4d83 SHA-1: 8853a771764b4fc0a5a0c2a4ec4264df868ae105 SHA-256: 9337aee286282981bf3c9eb418dd25d5fc1496bc0d335b76c46fd00d86ad17f8
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs pointing to disposable domains, a tactic often used for phishing or distributing further malicious content. The 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic strongly suggests this is a link farm designed to obscure the true malicious intent. While no scripts were explicitly extracted, the ML classifier and ClamAV detection indicate a high likelihood of malicious functionality, possibly leveraging embedded JavaScript or other PDF exploits.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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 http://clubselectionvoyages.net/images/file/rodovixigixigusorovexoz.pdf In PDF document text
    • http://lexen.ca/userfiles/files/meguwefifaf.pdfIn PDF document text
    • http://synergienetwork.net/userfiles/file/wapuvinej.pdfIn PDF document text
    • https://www.hkfew.org.hk/ckfinder/userfiles/files/60924755562.pdfIn PDF document text
    • https://euroquimicadistribucion.com/zabaleta/data/imagenes_contenidos/file/daporivib.pdfIn PDF document text
    • https://nhahangphongcanh.com/uploads/files/xeriwoxedowekusad.pdfIn PDF document text
    • http://noithatlekhanh.com/Images_upload/files/50088238950.pdfIn PDF document text
    • http://ps-chiptuning.hu/userfiles/files/5975896129.pdfIn PDF document text
    • http://svarovani-tig.cz/userfiles/file/95161824148.pdfIn PDF document text
    • http://iccjsc.vn/images/uploads/files/52908195654.pdfIn PDF document text
    • https://tbsva.org/Upload/files/20210903225352.pdfIn PDF document text
    • https://sokolzgierz.pl/web/uploads/files/rufimesoridifane.pdfIn PDF document text
    • http://austral-immo.com/userfiles/files/92249940250.pdfIn PDF document text
    • http://luluscafeonline.com/uploads/files/renuxa.pdfIn PDF document text
    • http://ipllaser.in/uploads/34446994013.pdfIn PDF document text
    • http://trovas.com/userimages/75286720949.pdfIn PDF document text
    • http://architettodrabeni.it/userfiles/files/84482937817.pdfIn PDF document text
    • http://sinhorelli.com/userfiles/file/novewekagoremavavona.pdfIn PDF document text
    • https://hattshopping.com/admin/assets/images/ckfiles/55312025184.pdfIn PDF document text
    • http://cp-tournament.org/ckfinder/userfiles/files/dovojenixojivumaz.pdfIn PDF document text
    • http://amwordpress.org/wp-content/plugins/formcraft/file-upload/server/content/files/1613a9ec87b922---norix.pdfIn PDF document text
    • https://taucaotoccatba.vn/images/news/files/matuzavekogewipemev.pdfIn PDF document text
    • https://myagenda.myagenda.cz/pictures/editor/files/76866094571.pdfIn PDF document text
    • http://techniq.ae/admin/uploadfiles/file/xijinudivofipubapu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=tv+play+app+downloadPDF 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_off0000dbf2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBF2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f404.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF404 17492 bytes
SHA-256: 37f3e92326dbb6e254d70987bf8ef2ae1dafce23747ae1368ca457491c7627c2
font_02_sfnt_off000120f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x120F6 10024 bytes
SHA-256: e67f7652f4558e00c1ecaec8ca30ac9e6a106f4b0a7bd2c55d6f4b6e9b79741c