Malicious PDF — malware analysis report

Static analysis result for SHA-256 d82540a115d943a3…

MALICIOUS

PDF

63.7 KB Created: 2021-09-08 21:58:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: cf432ecade3250c42cbdd9de1eb78a7b SHA-1: 2dbbae75fd4607c2f72ac3e32c94cb09c54acb57 SHA-256: d82540a115d943a38487c8b0e7f45879988b0868d0bf8b023019745b8d3b7635
124 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs pointing to disposable domains, a common tactic for phishing or distributing further malware. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URIs suggest it's designed to redirect users to potentially harmful content, likely as part of a phishing campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.6298

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://chcial.ru/uplcv?utm_term=how+to+update+your+phone+software PDF link annotation
    • http://konberdbio.com/upload/files/18998417886.pdfIn PDF document text
    • http://hong-tour.com/FileData/ckfinder/files/20210906_B057C6D0404E0009.pdfIn PDF document text
    • http://altadirezione-consulting.it/userfiles/files/63780635735.pdfIn PDF document text
    • http://cansuyu.org/resimler/files/33157326492.pdfIn PDF document text
    • http://zabbeleecooking.com/ckfinder/userfiles/files/fusafewejij.pdfIn PDF document text
    • http://rcp-ranstadt.us/files/zeforovubokiliturunowar.pdfIn PDF document text
    • https://stehovani-ostrava.cz/static_pages_files/file/7156820442.pdfIn PDF document text
    • http://majedalkarkhi.com/pics/file/difetarekago.pdfIn PDF document text
    • http://structurecreative.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612ff5f0f1fe5---68521806213.pdfIn PDF document text
    • http://dreesmann-foto.de/userfiles/file/65042199220.pdfIn PDF document text
    • http://kiemdinhcan.com/Images_upload/files/fexurituvuvo.pdfIn PDF document text
    • https://gedayapi.com/userfiles/file/vumiruzug.pdfIn PDF document text
    • http://anneadamslaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/jotelajifuvorojo.pdfIn PDF document text
    • http://holidayservicemarsala.it/userfiles/files/zelefidetuwijanonit.pdfIn PDF document text
    • https://lrsdev.com/userfiles/file/83314211429.pdfIn PDF document text
    • https://gestionarival.com/userfiles/file/zonazodudaserirave.pdfIn PDF document text
    • http://copy-office.it/userfiles/file/11626166890.pdfIn PDF document text
    • http://cmsrecuperocrediti.it/images/file/nawuvidanax.pdfIn PDF document text
    • http://inruho.ru/ckfinder/userfiles/files/vexajofobofesiwazilajeli.pdfIn PDF document text
    • http://daiduongmetal.com/uploads/ckfinder/files/bokuwuketog.pdfIn PDF document text
    • http://german-ex.com/images/blog/file/petitomiwuziwajadewiromo.pdfIn PDF document text
    • http://volker-issmer.de/userfiles/file/98543834963.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_off0000c632.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC632 10748 bytes
SHA-256: f89e96e96aa9357ab6886c1c45fd993d5843b69c13aa2df2b7faa624151b89e4
font_01_sfnt_off0000dee9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEE9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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