Malicious PDF — malware analysis report

Static analysis result for SHA-256 3596668498340e37…

MALICIOUS

PDF

85.2 KB Created: 2021-09-19 11:29:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 4a857a6c5e1bf6eb6a550bf5b3a8ece6 SHA-1: af47560def0e5785b55383b248a7de9d70b0837f SHA-256: 3596668498340e3773d99f2e3cd035b74b9c021347c5cb88805e55f29d1827e7
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many pointing to disposable domains, and is flagged by ML classifiers and ClamAV as malicious. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a pattern of creating numerous links on disposable hosting, suggesting a phishing or malware distribution scheme. The presence of external URIs and the overall structure strongly suggest an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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 https://garglob.ru/uplcv?utm_term=occupation+zombie+game PDF link annotation
    • https://betsin.org/userfiles/files/weginapiwuzegowukakox.pdfIn PDF document text
    • http://yourhealthyanswer.com/ckfinder/userfiles/files/mowuz.pdfIn PDF document text
    • http://dytac.hk/userfiles/kekadupesujinesefazuvewuv.pdfIn PDF document text
    • http://alicekhenrylawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/75429934391.pdfIn PDF document text
    • https://clubforeducation.com/FCKeditor/userfiles/file/funovidibabuwoxe.pdfIn PDF document text
    • http://kutscher-customs.de/gfx/userfiles/files/gepozu.pdfIn PDF document text
    • https://pasationtravellers.com/root/FCKeditor/file/45362799529.pdfIn PDF document text
    • https://maydangson.com/vietkiendo/upload/file/popodinafivelikaxikutib.pdfIn PDF document text
    • http://gzbaosui.com/uploadfile/files/23839983354.pdfIn PDF document text
    • http://www.jindatunnel.com/up_files/file/76947170020.pdfIn PDF document text
    • http://immobilieninvestors.eu/userfiles/file/rozokowupugefepigubipi.pdfIn PDF document text
    • http://liveisagenix.com/ckfinder/userfiles/files/85600599108.pdfIn PDF document text
    • http://ekorob.pl/userfiles/file/piwaroga.pdfIn PDF document text
    • http://suachuamaydemtien.biz/userfiles/file/19397905640.pdfIn PDF document text
    • https://masukpt2.com/contents/files/31844940744.pdfIn PDF document text
    • https://sevenhillsgroup.net/ckfinder/userfiles/files/22552355415.pdfIn PDF document text
    • http://hillsdalehorseboarding.com/ckfinder/userfiles/files/31628305893.pdfIn PDF document text
    • http://tentimesneedlehill.com/UPFILE/userfiles/files/76453511023.pdfIn PDF document text
    • http://www.webtony.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16130abe71f824---tetudiwigowisomo.pdfIn PDF document text
    • https://prestinieurope.ch/userfiles/files/50687841219.pdfIn PDF document text
    • http://gelateriacool.it/userfiles/files/fupuvozu.pdfIn PDF document text
    • http://alessandrotria.altervista.org/areap/ckfinder/userfiles/files/dupowujakabobonid.pdfIn PDF document text
    • 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_off0000ea85.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA85 17296 bytes
SHA-256: 0a2a5f0cafc52d8e6b93833734fcd1062dda5d4359ab3ccb321bda133debd3e9
font_01_sfnt_off00011739.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11739 10728 bytes
SHA-256: 9531be5ab98eecc40195a47e074722ac8385ab793d1328b98ce8f5c64a90abec
font_02_sfnt_off00012fb4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12FB4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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