Malicious PDF — malware analysis report

Static analysis result for SHA-256 3f52b19ab37efdae…

MALICIOUS

PDF

84.6 KB Created: 2021-09-16 20:29:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: b7d57f6a56ed1858781df72903301913 SHA-1: 7a7af0e73430397fe8744d452e5572dfc81ec4ca SHA-256: 3f52b19ab37efdaef6718dd0e22cd5a9dbb9611a0b899d826a9b40ba607ea2fd
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ML classifiers and ClamAV, specifically as a phishing trojan. The PDF contains numerous embedded URLs pointing to a link farm, indicating a likely attempt to manipulate search engine results or distribute further malicious content. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic confirms the presence of a link farm on disposable hosting.

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 http://coral-travel66.ru/admin/ckfinder/userfiles/files/wobilituvipijumexogul.pdf In PDF document text
    • http://premiumcsp.com/uploads/files/45205608718.pdfIn PDF document text
    • http://vansuloi.com/uploads/userfiles/file/49123763540.pdfIn PDF document text
    • http://www.qookspot.kitchen/wp-content/plugins/formcraft/file-upload/server/content/files/16131907b32ef7---toladuxavevamijebowuv.pdfIn PDF document text
    • https://rajatotogroup1.com/contents/files/rixigok.pdfIn PDF document text
    • http://savvyais.com/userfiles/file/92141635504.pdfIn PDF document text
    • http://medeeatour.ro/mm/file/pulibe.pdfIn PDF document text
    • http://gift-founder.com/archive/upload/files/saxemudobixuti.pdfIn PDF document text
    • http://laxycoffee.com/upload/files/rupezorumegalikujiziwuwu.pdfIn PDF document text
    • http://mansiya.com/uploadfile/files/sububolabow.pdfIn PDF document text
    • http://psn-monolit.ru/img_file/files/68446877966.pdfIn PDF document text
    • https://elitteaccesorios.com/wp-content/plugins/super-forms/uploads/php/files/s73t1lii3a82r6qcn3jjm5v9qe/popozomaxipaziduw.pdfIn PDF document text
    • http://sungwoneng.com/upfile_editor/2021/files/43329998119.pdfIn PDF document text
    • https://agriplan-rs.com/dados/ckfinder/files/kanumepu.pdfIn PDF document text
    • http://thelonerangerfanclub.com/ckfinder/userfiles/files/gipanave.pdfIn PDF document text
    • http://cmtoolsrental.com/user_img/files/sidomefilofageb.pdfIn PDF document text
    • https://phongkhamtamthan.net/uploadeditor/files/fufutezigu.pdfIn PDF document text
    • https://smshealthcareservices.com/ckfinder/userfiles/files/jajesefemexivebuf.pdfIn PDF document text
    • https://hitourkorea.com/FileData/ckfinder/files/20210905_F0E30B74329A4F17.pdfIn PDF document text
    • http://ambvet-trefontane.eu/userfiles/files/butidatibusivebimelat.pdfIn PDF document text
    • http://ourpreferred.com/userfiles/files/16360848281.pdfIn PDF document text
    • http://kosmonautika.ee/ckfinder/userfiles/files/85330218675.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=new+inside+out+upper+intermediate+workbook+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_off0000d9db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9DB 22028 bytes
SHA-256: 9f0bbaac0b989c6435d479857f56953d366e989d16ae497cd3522633ae191e5d
font_01_sfnt_off00011310.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11310 11008 bytes
SHA-256: 10e81c39fe9cd1bac99bd069b3e120bb4f4787d12ddf522060e27926de001f6b
font_02_sfnt_off00012c85.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C85 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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