Malicious PDF — malware analysis report

Static analysis result for SHA-256 ec6cf636d5531044…

MALICIOUS

PDF

69.7 KB Created: 2021-09-25 21:02:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 21e956f383ee36c5071e10ab79baeedd SHA-1: 2bf430d743cfb204b668898ce4893d451da1e563 SHA-256: ec6cf636d5531044ed8e1fd6b3c054d8398c07807c4e3bade008a388d362a137
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to potentially malicious or unknown domains, suggesting a phishing or redirection attempt. The ML classifier and ClamAV detection strongly indicate malicious intent. The file's structure and the presence of multiple links on disposable hosting further support its classification as a malicious document, likely used for phishing or distributing further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://proleague.dk/userfiles/file/puwaz.pdf In PDF document text
    • https://kingyao.com/uploadfiles/files/20210831_230306_1954.pdfIn PDF document text
    • http://dija.lv/public/userfiles/file/64774303737.pdfIn PDF document text
    • https://www.adom.biz.pl/ckfinder/userfiles/files/wamaxutexek.pdfIn PDF document text
    • http://capriololaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/25317220550.pdfIn PDF document text
    • http://sarkar.ie/userfiles/file/sekoramitizorobubanuga.pdfIn PDF document text
    • http://friluftsgruppen.se/wp-content/plugins/formcraft/file-upload/server/content/files/16143501497c76---34241833588.pdfIn PDF document text
    • http://majortaylorride.info/images/uploaded/file/33921377449.pdfIn PDF document text
    • http://fibertechnique.com/tmp/file/podefat.pdfIn PDF document text
    • http://moscowfashion.net/content/xuploadimages/file/buxenutedilozobewaworov.pdfIn PDF document text
    • http://newdimension.su/userfiles/file/88893423679.pdfIn PDF document text
    • http://www.gdchgs.com/admin/img/files/67194635163.pdfIn PDF document text
    • http://louisefarmersmith.com/admin/ckeditor/ckfinder/userfiles/files/fakemoge.pdfIn PDF document text
    • https://djennebeads.com/nbloom/fckuploads/file/22451698675.pdfIn PDF document text
    • http://barexkft.hu/userfiles/file/wurixosezewaselawok.pdfIn PDF document text
    • https://sketchup360.vn/wp-content/plugins/super-forms/uploads/php/files/c9vh11slamjqqlfri9ihclcp8b/xeturojebagaz.pdfIn PDF document text
    • https://www.afoa.org.ar/backend/ckfinder/userfiles/files/3207608721.pdfIn PDF document text
    • https://iwistw.com/upload/files/20470799633.pdfIn PDF document text
    • http://cnwt.mgo.cool/upfile/files/2021/09/05/jupotemibulobifudo.pdfIn PDF document text
    • http://bluekeydigital.com/images/pic/file/49043102393.pdfIn PDF document text
    • https://matricula.arendic.cl/files/memomubolirovawurujutoluv.pdfIn PDF document text
    • https://komunalno-vrgorac.hr/files/ganelotizajuwusepe.pdfIn PDF document text
    • http://logenamerica.com/userfiles/file/sisoditatinu.pdfIn PDF document text
    • http://fractinvest.com/uploads/file/90829695568.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=best+music+composing+app+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_off0000b197.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB197 11072 bytes
SHA-256: 8adf27f3e7d11065ac612cef37ede1a8b4511c389317a927517657cb619e9574
font_01_sfnt_off0000cb39.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB39 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e34b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE34B 15188 bytes
SHA-256: 862dc1f0010b6f35e6ebfb4279fe46a90809d7fa675512621685bf1c32637067