Malicious PDF — malware analysis report

Static analysis result for SHA-256 f438a67853b4efb6…

MALICIOUS

PDF

112.4 KB Created: 2021-09-12 16:12:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 39863bd0ca3e2b041440b922a63947b8 SHA-1: 66eac40f2902c2b8595906eca777e265a5b80cfe SHA-256: f438a67853b4efb6af73802d0fd5bb170739f6daf114d3f80707d7c715d90991
102 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The critical ClamAV detection and the presence of embedded JavaScript indicate malicious intent. The PDF contains numerous external URIs, many of which point to disposable domains, suggesting a link farm or phishing lure. The embedded JavaScript likely facilitates the redirection to these external sites, which are designed to deceive the user.

Machine Learning

  • Nyx PDF Classifier clean score 0.2222

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://nsstore.mx/ckeditor/ckfinder/archivossubidos/files/lerikuwoxemi.pdf In PDF document text
    • https://smsenerji.com/resimler/files/zurupamovefejezami.pdfIn PDF document text
    • http://factorycontrolprojects.com/userfiles/file/57274534106.pdfIn PDF document text
    • http://sm300159.agchost.com/userfiles/files/wewivanuzinosijisofub.pdfIn PDF document text
    • http://burragebrothers.net/demo/jolie/beta/userfiles/files/58424028111.pdfIn PDF document text
    • https://nasco-ye.com/uploads/file/6084713753.pdfIn PDF document text
    • http://tks-forever.com/upload/2021/09/03/file/jatovetakusudobimozave.pdfIn PDF document text
    • http://contua.org/userfiles/file/zoxidagusukilejiponom.pdfIn PDF document text
    • http://domario.ru/userfiles/file/47961328485.pdfIn PDF document text
    • http://sandsflooring.co.uk/ckfinder/userfiles/files/toxedaxom.pdfIn PDF document text
    • http://iberryhomemade.com/userfiles/files/32573672613.pdfIn PDF document text
    • http://hatowo.com/app/webroot/uploads/files/37806596319.pdfIn PDF document text
    • http://nincity.de/inline/file/58397744376.pdfIn PDF document text
    • http://burningspearmarketplace.com/js/ckfinder/userfiles/files/memugolegowide.pdfIn PDF document text
    • http://chinastom.ru/userfiles/file/72322804162.pdfIn PDF document text
    • https://griby.biz/ckfinder/userfiles/files/10198747268.pdfIn PDF document text
    • http://chukgoobok.com/files/fckeditor/file/35562597015.pdfIn PDF document text
    • http://mygiftltd.com/userfiles/file/16596168523.pdfIn PDF document text
    • http://marinaxaraes.com.br/ckfinder/userfiles/files/dovufalavekiwozumuva.pdfIn PDF document text
    • http://yejida.com/userfiles/file/viguliwupebinud.pdfIn PDF document text
    • https://www.fifatravels.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138db5ac638a---gufebokikuvujolisofi.pdfIn PDF document text
    • https://bloomeng.com/uploads/45582960495.pdfIn PDF document text
    • http://111-orte.de/testarea/cwsCMSlight/media/files/49482057941.pdfIn PDF document text
    • http://ttlengenharia.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/161345e99b13aa---kotiririg.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=zombie+catchers+hack+game+downloadPDF link annotation
    • 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_off00016457.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16457 11100 bytes
SHA-256: 91ca755a5c5832ac83ce940d19b0dad9830ff50791791518a0929c8b9cf7cd07
font_01_sfnt_off00017de4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17DE4 19928 bytes
SHA-256: f610718f027be9289a601907d44bf8da040b62195340ca22453514d93fe48843

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