Malicious PDF — malware analysis report

Static analysis result for SHA-256 437b2cb596c90359…

MALICIOUS

PDF

60.9 KB Created: 2021-09-26 13:57:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 4948444df3ae00a1f4d0c68f996f8c7f SHA-1: f22d7335812198968e2089e1e6ed613e2d9620cc SHA-256: 437b2cb596c903597411402d2db1c057b5764cdaff7fb614ebbf26c2f90aaeb0
124 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and a machine learning classifier indicated maliciousness. It contains numerous embedded URLs, many of which point to disposable domains, suggesting a link farm designed to obscure the ultimate destination. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports this, indicating a non-clustered link farm on disposable hosting. No scripts were extracted, but the presence of multiple external URIs suggests the document's primary purpose is to redirect users to potentially malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.6644

Heuristics 4

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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 http://crestviewshopping.abwingsmd.com/uploads/files/22112369928.pdf In PDF document text
    • https://skatrip.com/basefile/skatripcom/files/68124292814.pdfIn PDF document text
    • http://hajnysport.cz/FCK_userfiles/file/73158413582.pdfIn PDF document text
    • http://dgelc.com/userfiles/file/20210905111342.pdfIn PDF document text
    • http://www.sarajevo-inn-grunewald.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613cf1087bd6f---lovovifinuvafu.pdfIn PDF document text
    • http://kvarkeno56.ru/userfiles/file/wosijogofil.pdfIn PDF document text
    • http://4bx.pl/public/file/pokijiwumirizikoteji.pdfIn PDF document text
    • http://orthodoxvaidikasanghom.org/userfiles/file/8270573120.pdfIn PDF document text
    • http://zbraneklapka.cz/ckfinder/userfiles/files/91641327468.pdfIn PDF document text
    • https://ln80.cn/filespath/files/20210902125215.pdfIn PDF document text
    • https://sipare.com.ar/wp-content/plugins/super-forms/uploads/php/files/u56t7m21es8dv5r5921lumvbal/rilorasarinubinojileveb.pdfIn PDF document text
    • http://dzerzhinsk.timebank.ru/sites/default/files/photos/pagefile/budokaxulu.pdfIn PDF document text
    • http://sgd42.ru/userfiles/file/66026405409.pdfIn PDF document text
    • https://locktactyuma.com/userfiles/file/ridugagidunadabivedilafop.pdfIn PDF document text
    • https://www.moxiclear.com.au/application/third_party/ckfinder/userfiles/files/gidizeturupimu.pdfIn PDF document text
    • https://penzion-palice.cz/content/13564383246.pdfIn PDF document text
    • https://cometgroupinternational.com/ckeditor/ckfinder/userfiles/files/powejo.pdfIn PDF document text
    • http://ekstelekom.com/userfiles/file/59772878649.pdfIn PDF document text
    • http://rebornfair.com/FileData/ckfinder/files/20210901_2DDAD5FF384AC41A.pdfIn PDF document text
    • http://andrenickels.de/ckfinder/userfiles/files/neremapazagozuzezuganuk.pdfIn PDF document text
    • http://alrabbancapital.com/file/files/vojuwadasotitewoga.pdfIn PDF document text
    • https://defi128.phpascal.com/userfiles/files/kikajurukudulomaxojadorad.pdfIn PDF document text
    • https://businessincasey.com.au/application/third_party/ckfinder/userfiles/files/semazigob.pdfIn PDF document text
    • http://yotlist.com/uniformkontakt/userfiles/image/files/34569876035.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=noise+meter+app+android+freePDF link annotation
    • 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_off0000b44b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB44B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cc62.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC62 10588 bytes
SHA-256: d3be33aa60bc0e395ba0104b01f4620cb17757536d4b005bcfa066649231b98c

Open this report in the interactive analyzer, or submit your own file for analysis.