Malicious PDF — malware analysis report

Static analysis result for SHA-256 709173356fb2013b…

MALICIOUS

PDF

76.1 KB Created: 2021-11-08 11:53:22 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: ab35569241c8269adecee12948e23fb4 SHA-1: c85c91f0a4973eeb749930ff462a6c073c5365b0 SHA-256: 709173356fb2013ba33942743a8c2e30493123879e4ad3b21bfbdf0bb6634ba3
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs pointing to a link farm hosted on disposable domains, suggesting a phishing or malware distribution scheme. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic indicates a deliberate attempt to obscure the true destination through multiple redirects and a large number of links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

Heuristics 6

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://ogledalata.bg/uploads/pages/files/goxiwaxojomawomot.pdf In PDF document text
    • http://cdio.vn/uploads/userfiles/file/redugifojomogo.pdfIn PDF document text
    • https://libyamonitor.com/sites/all/libraries/ckfinder/userfiles/files/96370781199.pdfIn PDF document text
    • http://embody.box8websites.com/ckfinder/userfiles/files/gafudulixurolosijijibetun.pdfIn PDF document text
    • http://xn--d1achljw0b.xn--p1ai/content/upload/zikofaxiragatuj.pdfIn PDF document text
    • https://izharfoster.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131078fece1b---77322044449.pdfIn PDF document text
    • https://egyseg.eu/ckfinder/userfiles/files/89459359810.pdfIn PDF document text
    • https://hse.tw/upload/file/xafudimibus.pdfIn PDF document text
    • http://hueide.com/upload/files/40122740787.pdfIn PDF document text
    • http://www.ettermanenterprises.com/ckfinder/userfiles/files/vopumebijesopevewaler.pdfIn PDF document text
    • https://shreeaksharinternational.com/webroot/img/userfiles/files/pirivekapuna.pdfIn PDF document text
    • https://metroguards.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16167ff4b931fe---kunakijasekod.pdfIn PDF document text
    • http://wangguanhardware.com/userfiles/file/15030729881.pdfIn PDF document text
    • http://generale-bureautique.fr/gdb/files/file/90077256105.pdfIn PDF document text
    • http://noxsun.com/jingkelun/userfiles/files/20210915123430.pdfIn PDF document text
    • http://www.azurwelcomeservices.com/userfiles/file/17954762396.pdfIn PDF document text
    • http://tabbanbros.com/admin/fckeditor/editor/filemanager/connectors/upload/file/vokopegasete.pdfIn PDF document text
    • http://feedproxy.google.com/~r/Xvkpad/~3/RC0zOYPQW8A/uplcv?utm_term=ask+and+it+is+given+free+pdf+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_off0000b705.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB705 16540 bytes
SHA-256: 45015263e28dbf00792e0fa83ae0fb9123af5110209f191c00797c49350166ef
font_01_sfnt_off0000ce2b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE2B 10896 bytes
SHA-256: 414301674e2c7d280cc78a8e5496081c9328ca4a33ae1e0a784b271926a649d4
font_02_sfnt_off0000e75f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE75F 23192 bytes
SHA-256: 54b15efb213e1c19ead437975abc378d6b36e97c207306b70618548ae1707a19

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