Malicious PDF — malware analysis report

Static analysis result for SHA-256 76381b103e79f333…

MALICIOUS

PDF

105.3 KB Created: 2021-09-20 04:03:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 28c46acd3c30bc20db6a2867ca92563b SHA-1: e9d94ac74833844a053e4b439860e0e20b554cc9 SHA-256: 76381b103e79f333128342c5ad82e85604c0ccad70b121ca356985d9b6c82bc7
206 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by a machine learning classifier and ClamAV. It employs social engineering tactics, specifically a 'ClickFix' lure and a 'Browser Install Lure', to trick users into executing commands or installing malicious software. The document body is heavily obfuscated, but the heuristics indicate a clear intent to deceive the user into performing actions that would likely lead to further compromise.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9966

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • ClickFix social engineering attack high SE_CLICKFIX
    Document instructs the user to press Win+R or paste a command into a terminal — consistent with ClickFix attacks that bypass macro restrictions by tricking users into running malicious commands directly
  • Browser extension / update installation lure high SE_BROWSER_INSTALL_LURE
    Document tells the user to install a browser extension, plugin, viewer, or browser update to view content — a common social-engineering path for credential theft and malware installation
  • 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 http://gocoachfox.com/userfiles/file/pijazibuzefibej.pdf In PDF document text
    • http://e-hematologica.pl/users/file/galuxeluwavezab.pdfIn PDF document text
    • https://mama-light.net/business_school/uploads/file/gejumelenosenewo.pdfIn PDF document text
    • https://sammycar.ch/sammy/sites/default/sammyfiles/newsletterfile/bunuvatozuxowawanosunar.pdfIn PDF document text
    • https://brukspec.pl/upload/file/dofim.pdfIn PDF document text
    • http://mazraeir.com/images/upload/files/84724251261.pdfIn PDF document text
    • https://skywaynepal.com/userfiles/file/73677134033.pdfIn PDF document text
    • https://nepalfinepashmina.com/userfiles/file/71446495873.pdfIn PDF document text
    • https://mundolibre.cl/uploads/userfiles/files/padifarewisel.pdfIn PDF document text
    • https://www.wappa.com.au/siteadmin/ckfinder/userfiles/files/jikojijuzizapagakanalu.pdfIn PDF document text
    • http://sabaispa.net/userfiles/file/16523431686.pdfIn PDF document text
    • https://amezdigital.com/wp-content/plugins/super-forms/uploads/php/files/33668bc868e0302fb8ce5fde3ebb2164/49441826895.pdfIn PDF document text
    • https://twr1115.net/files/fckeditor/file/41702581082.pdfIn PDF document text
    • https://nls.vn/upload/files/vexuwamivumijumogefap.pdfIn PDF document text
    • http://www.emporiocaritaspisa.it/wordpress/wp-content/plugins/formcraft/file-upload/server/content/files/1613b10b47b4b5---89696731017.pdfIn PDF document text
    • https://www.speeddating.lt/speeddating/ckfinder/userfiles/files/64571814585.pdfIn PDF document text
    • http://duquenne-moteurs.fr/webroot/upload/files/nigilowanewupinivefa.pdfIn PDF document text
    • https://matharu.ae/userfiles/file/goselixawixexifeki.pdfIn PDF document text
    • http://bnblspecialities.com/userfiles/files/fokisetubupufebojudedex.pdfIn PDF document text
    • https://bnbcostaverde.it/userfiles/file/13892618412.pdfIn PDF document text
    • http://clubsahdianagalati.ro/upload/editor/file/towom.pdfIn PDF document text
    • http://gesgo.de/userfiles/file/7626739091.pdfIn PDF document text
    • http://hytechplus.com/userfiles/file/kogavubivuniwipubuwaxop.pdfIn PDF document text
    • http://iamsoldierfit.com/wp-content/plugins/formcraft/file-upload/server/content/files/16147aafe46fce---zutapexurakitovikujile.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=enable+chrome+dark+modePDF 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_off00013601.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13601 19164 bytes
SHA-256: 70f66bf2399718fe40bbff89ffc42156bf83996bdc2c5180bc906aeba9259015
font_01_sfnt_off000167a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x167A3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00017fba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17FBA 10492 bytes
SHA-256: b95eda1b891cb5067174c2906885fc49fe36036d340ff1c66ff34dbef41166de

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