Malicious PDF — malware analysis report

Static analysis result for SHA-256 4637ab5d661777d6…

MALICIOUS

PDF

67.9 KB Created: 2021-10-03 00:49:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 007949616810f391797adec56d254316 SHA-1: 4d6e18aa937f4ff5b444fb62551420d61c79b967 SHA-256: 4637ab5d661777d6d909421370a919718d82a98c6859c0f4ff858b754029d8c4
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous embedded URLs pointing to disposable domains, a common tactic for phishing or distributing further malware. The 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic indicates a high volume of links on potentially untrustworthy hosting. ClamAV detection and ML classification strongly suggest malicious intent, likely related to phishing or malware delivery via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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 https://drafthe.ru/uplcv?utm_term=chinese+lion+dance PDF link annotation
    • https://360clothing.in/home/www360cl/public_html/uploads/images/files/12108618625.pdfIn PDF document text
    • http://lachina.cn/upload/file/kuneduxojomi.pdfIn PDF document text
    • http://fueandhair.com/userfiles/files/dibavutudugitonalevunike.pdfIn PDF document text
    • https://fitvital.hu/userfiles/files/49159819077.pdfIn PDF document text
    • https://asiantms.com/ckfinder/userfiles/files/1058539742.pdfIn PDF document text
    • https://victory-agency.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614240cf781b3---75689976077.pdfIn PDF document text
    • http://brenderup.ro/mm/file/tupojezapozojedozivot.pdfIn PDF document text
    • http://tenis-klubmoj.si/uporabnik/file/81322127432.pdfIn PDF document text
    • http://rybarict.cz/webpagebuilder/ckfinder/userfiles/files/pewunamamineletejuririxi.pdfIn PDF document text
    • http://mail.teleserviciomalaga.com/ckfinder/userfiles/files/3359820698.pdfIn PDF document text
    • http://geologicatoscana.eu/userfiles/files/54710634166.pdfIn PDF document text
    • https://mimpishio1.com/contents/files/25745814651.pdfIn PDF document text
    • http://infinijewelry.com/userfiles/file/34053598825.pdfIn PDF document text
    • http://www.reroofingbrisbaneqld.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/161405a6bbb8e7---31709277286.pdfIn PDF document text
    • https://tidurmalam2.com/contents/files/nekigisegipoxul.pdfIn PDF document text
    • http://badgerhillfarm.uk/71132807700.pdfIn PDF document text
    • http://jszl-rolls.com/filespath/files/20210901202956.pdfIn PDF document text
    • http://gldbirdgel.com/user_img/files/37250217132.pdfIn PDF document text
    • https://www.abandassociates.com/ckfinder/userfiles/files/79278288600.pdfIn PDF document text
    • http://boldogelet.hu/media/romun.pdfIn PDF document text
    • 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_off0000ae2f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAE2F 14632 bytes
SHA-256: b0084c95d92cf6d7bab1505bd90994aa7333ecfb259db4bb50dc461e40b9ac4c
font_01_sfnt_off0000d329.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD329 10300 bytes
SHA-256: ea6b45c6890626d0431389f0d30523f020c5094258f0d3d4b752e2bbbfee8a80
font_02_sfnt_off0000ea46.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA46 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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