Malicious PDF — malware analysis report

Static analysis result for SHA-256 ca3178af2fc9d46d…

MALICIOUS

PDF

89.1 KB Created: 2021-09-27 13:52:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: ce68b9e8ca62812285e67f99ae43bcde SHA-1: da210179e61815fce51575c76824eed761ef95a1 SHA-256: ca3178af2fc9d46da32a072ee9a251054f4d5c294aee4c30cb374e8ae68453fa
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. The presence of an embedded JavaScript stream and a large number of external URIs, many pointing to potentially disposable domains, strongly indicates a phishing or redirection attempt. The document body is heavily obfuscated and unreadable, further supporting the malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9979

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.
  • 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 http://kino-profi.com/wp-content/plugins/super-forms/uploads/php/files/db7bdaa4f8627c8aa30b84d37baaf660/rutunoted.pdf In PDF document text
    • http://halvani.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a79f2eee99---46635336982.pdfIn PDF document text
    • https://culturasiapamplona.com/guiarte_userfiles/files/5939926259.pdfIn PDF document text
    • http://le383.com/uploads/files/wodot.pdfIn PDF document text
    • https://rdsdealers.com/ckfinder/userfiles/files/17285981069.pdfIn PDF document text
    • http://tsyrulnikov.ru/upload/file/wawudevegudizenef.pdfIn PDF document text
    • https://healthlantern.com/ckeditor/ckfinder/userfiles/files/54013119071.pdfIn PDF document text
    • https://thic.net/plugin/ce1/ckfinder/userfiles/files/4213313874.pdfIn PDF document text
    • https://hotellemaritime.com/hotel/upload/files/rimonutozedis.pdfIn PDF document text
    • http://lamachine.nl/userfiles/file/33235054839.pdfIn PDF document text
    • http://rent2day.ca/ci2/userfiles/files/4152804429.pdfIn PDF document text
    • http://miet-boot.ch/images/uploadedimages/file/58109175413.pdfIn PDF document text
    • http://didaconcept.com/admin/fckeditor/file/10886922277.pdfIn PDF document text
    • https://alnahamgroup.com/userfiles/file/duvigawiku.pdfIn PDF document text
    • http://tsutae-f.com/js/upload/files/tumejulemel.pdfIn PDF document text
    • http://tuzoltosagmihald.hu/userfiles/file/lefefopivemuk.pdfIn PDF document text
    • http://quantri.thaisonpalacehotel.com/upload/files/72240356810.pdfIn PDF document text
    • http://crystal-lamp.ru/uploads/files/jetezotivajekapixarin.pdfIn PDF document text
    • http://ippinnudon.com/uploads/files/bokemejolaf.pdfIn PDF document text
    • https://otoform.com/upload/ckfinder/files/25700617542.pdfIn PDF document text
    • http://voijin.com/userfiles/files/kimiwunuxiz.pdfIn PDF document text
    • http://donahoelawfirm.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/38295428464.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=c%C3%A1ch+ch%C6%A1i+game+gi%E1%BA%A3+l%E1%BA%ADp+tr%C3%AAn+androidPDF 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_off0000e9f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9F5 11832 bytes
SHA-256: ce1de158ed3a390453d707ace52cccfae16a7c894db2b2e5eb67990868b5653b
font_01_sfnt_off000103ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103FF 28944 bytes
SHA-256: 4fdc70c66566fffeac6f39299b9bc4e6ec65f89e2193b9ddbffae1715ca578a9
font_02_sfnt_off00013c41.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13C41 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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