Malicious PDF — malware analysis report

Static analysis result for SHA-256 9d5f06751be7d52f…

MALICIOUS

PDF

72.0 KB Created: 2021-10-01 18:55:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-07
MD5: f54b3c2ecc94654d24a09e7bfc78017d SHA-1: ae92c3897bec4e76bf08195bfcdf2f3cc0fd6bb3 SHA-256: 9d5f06751be7d52ff45b7bd2b31cc76e80395f05cfa149a76a402da625bc82b4
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, a common technique for executing malicious code within documents. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates the PDF is designed to host numerous links, suggesting a phishing or redirection scheme. The ML classifier and ClamAV detection strongly support the malicious nature of this file.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9837

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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
  • 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://mandaljeebanking.in/ckfinder/userfiles/files/warinezofepizapis.pdf In PDF document text
    • https://balarampurblock.in/ckfinder/userfiles/files/tonotiradekema.pdfIn PDF document text
    • http://tolaniprojects.com/userfiles/file/67200737424.pdfIn PDF document text
    • http://jullien38.com/ressource/site-image/files/39379648276.pdfIn PDF document text
    • https://veglifekc.org/wp-content/plugins/super-forms/uploads/php/files/samemiwulopanixigelapin.pdfIn PDF document text
    • https://ngonluathan.com/images/ckeditor/files/11740532608.pdfIn PDF document text
    • http://www.corazondelsol.es/ckfinder/userfiles/files/dileliriwenewezob.pdfIn PDF document text
    • http://grupopiscis.com/upload/files/90853231336.pdfIn PDF document text
    • http://wieswioska.pl/userfiles/file/nowebugekababujomosiligef.pdfIn PDF document text
    • http://temple.mo/userfiles/file/75691020510.pdfIn PDF document text
    • http://electriccityusa.com/images/fck_uploads/file/445247423.pdfIn PDF document text
    • http://lalitas-thaimassage-spa.de/wp-content/plugins/formcraft/file-upload/server/content/files/1614090170f7c9---xagekokigiji.pdfIn PDF document text
    • http://otevrel.eu/ckfinder/userfiles/files/54043196074.pdfIn PDF document text
    • https://insinkerator.us/images/uploaded/file/wanubuzidu.pdfIn PDF document text
    • http://dgxzz.com/uploadfile/file/47003328301.pdfIn PDF document text
    • http://battlegrouponline.com/app/webroot/js/ckfinder/userfiles/files/19672412908.pdfIn PDF document text
    • http://pro-customer.de/userfiles/file/sovakiziwepo.pdfIn PDF document text
    • http://freeware-software-download.de/uploads/editor/file/67589414173.pdfIn PDF document text
    • http://zamgph.com/FCKeditor/editor/filemanager/connectors/php/uploads/file/011734061284.pdfIn PDF document text
    • http://domki-kopalino.pl/pliki/zinonadesaleretorul.pdfIn PDF document text
    • https://cortemadera.com/wysiwygfiles/file/jagujigeniwakivaxiniposa.pdfIn PDF document text
    • http://dogoxuavanay.vn/uploads/files/paturefa.pdfIn PDF document text
    • https://kozhikodedeaf.org/admin/my_files/file/ruduj.pdfIn PDF document text
    • https://ibliberia.com/ckfinder/userfiles/files/rekezuj.pdfIn PDF document text
    • http://thcsnguyenvanhuyen.hoaiduc.edu.vn/ckfinder/userfiles/files/67369680361.pdfIn PDF document text
    • http://stressmanagement-karriere.de/userfiles/file/sakozisaw.pdfIn PDF document text
    • http://220-wm01.netdbhosting.com/file/kuloruribur.pdfIn PDF document text
    • http://www.farmaciapenil.es/userfiles/files/jevoverosadedaxu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=somewhere+over+the+rainbow+ukulele+chords+pdfPDF 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_off0000b5ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB5CE 16600 bytes
SHA-256: c6bb65165bc34da2b6d57903ff2e7371df38be9c86efdd9963850b6725642cd8
font_01_sfnt_off0000df50.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF50 11444 bytes
SHA-256: 478c3c916381982ffaf071e61851243260aa26ee8e2278b678aa30f3c99ac6ab
font_02_sfnt_off0000f9fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9FA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1