Malicious PDF — malware analysis report

Static analysis result for SHA-256 82c808296b4e1b19…

MALICIOUS

PDF

66.8 KB Created: 2021-09-20 10:46:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: cfa72e82b35ecaec5a0681e00fdb0b00 SHA-1: bd67f13a30c911e7491c2602cccb867f719abc7c SHA-256: 82c808296b4e1b19632336dbf29f0876633d2ecd782b24d6cf7d2fd7d3180795
132 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

The PDF contains embedded JavaScript and numerous external URIs, indicating an attempt to redirect the user to malicious websites. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly suggests the document's purpose is to host a large number of links on disposable domains, a common tactic for phishing or malware distribution. ClamAV detection further confirms its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.6279

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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://smidgel.ru/uplcv?utm_term=pixel+launcher+tablet PDF link annotation
    • http://microcement.ua/userfiles/file/45010571183.pdfIn PDF document text
    • https://www.shropshirefurniture.co.uk/admin/ckfinder/userfiles/files/zuvujelolepewomazuju.pdfIn PDF document text
    • http://faithleader.org/js/ckfinder/userfiles/files/21263062980.pdfIn PDF document text
    • http://hokkaido-love87.com/app/webroot/js/ckfinder/userfiles/files/93491391601.pdfIn PDF document text
    • http://chatyzvule.cz/uploads/21398140595.pdfIn PDF document text
    • https://secolink.sk/userfiles/file/70565827375.pdfIn PDF document text
    • http://zeshengtecphar.com/UploadFiles/FCKeditor/20210904044319.pdfIn PDF document text
    • http://www.w.radeton.cz/ckfinder/userfiles/files/wixodepafedukavelumonipes.pdfIn PDF document text
    • http://onishi-kyosendo.jp/archive/53413322773.pdfIn PDF document text
    • https://www.wizzfizz.com.au/application/third_party/ckfinder/userfiles/files/79937416469.pdfIn PDF document text
    • https://nationalcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613970689c409---baguvijobubamobupak.pdfIn PDF document text
    • http://lukoilmarine.com/ckfinder/userfiles/files/vewebenodus.pdfIn PDF document text
    • https://specializedfacilitymgt.com/public_html/userfiles/file/14031487566.pdfIn PDF document text
    • http://turnwealthy.com/ckfinder/userfiles/files/3712307492.pdfIn PDF document text
    • https://www.lorenzofranzone.it/wp-content/plugins/super-forms/uploads/php/files/6aff514667517aa5fff2b812e214577b/nopofapinawubam.pdfIn PDF document text
    • https://perfecthospitals.org/FCKeditor/file/74305299776.pdfIn PDF document text
    • http://vagyonvedelemszolnok.hu/admin/fck_upload/file/badul.pdfIn PDF document text
    • https://sunnyrosesschool.com/userfiles/file/72754265580.pdfIn PDF document text
    • http://cungcapbaoduongcuanhatban.com/upload/files/58447249864.pdfIn PDF document text
    • http://brandiassociati.it/userfiles/file/76751093253.pdfIn PDF document text
    • https://vidaleve.ind.br/ckfinder/userfiles/files/dosakakoko.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_off0000d865.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD865 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f07c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF07C 10380 bytes
SHA-256: f8676aca535a45e247f61f424cf6ce2a53a15a4c78bd924cb8e040eba39db926

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