Malicious PDF — malware analysis report

Static analysis result for SHA-256 9183befe4a8c2c94…

MALICIOUS

PDF

80.8 KB Created: 2021-09-13 00:59:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: f77d2c27659fd525225650c19b7ba455 SHA-1: 5ac17b8b5d182c16645e42b83d53a67a00855105 SHA-256: 9183befe4a8c2c94f297ff4dbdaa4d058d3c3280feecf7df01348ff5d9f3b937
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many pointing to disposable domains, and is flagged by ML classifiers and ClamAV as malicious. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a large number of links designed to appear legitimate but lead to malicious content. While no scripts were directly extracted, the structure and URL patterns are consistent with phishing or malware distribution campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 5

  • 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.
  • 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://inwebjor.ru/uplcv?utm_term=the+best+app+to+lock+apps PDF link annotation
    • https://gikguamerica.com/userfiles/file/71851441492.pdfIn PDF document text
    • http://kingalbertltd.com/uploadedfiles/file/tevosifepejijamez.pdfIn PDF document text
    • http://www.putnamtaxi.net/wp-content/plugins/formcraft/file-upload/server/content/files/16137d3c9639f9---5960010780.pdfIn PDF document text
    • http://spiregene.com/image/files/20210905_093652.pdfIn PDF document text
    • http://drukarnia-warszawa.pl/pliki/file/turoruki.pdfIn PDF document text
    • http://www.enfersalus.com/ckfinder/userfiles/files/faxosotek.pdfIn PDF document text
    • https://hiperaktivite.info/userfiles/files/fusaxuposupezatefatolab.pdfIn PDF document text
    • https://seo-methodes.com/userfiles/file/95177806535.pdfIn PDF document text
    • http://pk-rowery.pl/user_pict/file/wudifawofinajefuzilera.pdfIn PDF document text
    • http://spain-ex.com/images/blog/file/jeradasu.pdfIn PDF document text
    • https://havadisname.com/upload/ckfinder/files/59117404903.pdfIn PDF document text
    • http://rasciindia.com/firetech/ckupload/files/vodudo.pdfIn PDF document text
    • https://exlite.it/ckfinder/userfiles/files/5952575316.pdfIn PDF document text
    • https://ego-sofa.tw/uploads/files/202109052146209184.pdfIn PDF document text
    • https://dazzlin.co.uk/wp-content/plugins/super-forms/uploads/php/files/7fe721a8b97e2f4e7ef1b8c2be154203/24586469826.pdfIn PDF document text
    • http://lifebeachvilla.com/uploads/image/files/79273024467.pdfIn PDF document text
    • https://kiemtoandongnghi.com/public/plugins/ckfinder/userfiles/files/58632471918.pdfIn PDF document text
    • http://tai-group.com/upload/files/tamusononozefiduropa.pdfIn PDF document text
    • http://sobinco.cz/ckfinder/userfiles/files/tewodi.pdfIn PDF document text
    • http://worldcar.jp/userfiles/files/wozukukisalazolowalodize.pdfIn PDF document text
    • http://snuhonors.com/userfiles/file/purafugelato.pdfIn PDF document text
    • https://5uempat.com/contents/files/mipofizojanijakitinivov.pdfIn PDF document text
    • http://zs.tom.ru/jsplugins/ckfinder/userfiles/files/45447259178.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_off0000d911.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD911 10372 bytes
SHA-256: 7d76a8b8dbcee05212afdd3f22b01e74d4e4961f4feb8a386a151868d8d43f4e
font_01_sfnt_off0000f07e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF07E 17400 bytes
SHA-256: a36eb2a0c2a54b53bee3066aadd1cdd5eb081ab37cbd91095b6ba41be2cc14e6
font_02_sfnt_off00011d6a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D6A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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