Malicious PDF — malware analysis report

Static analysis result for SHA-256 f89c810c918fdba9…

MALICIOUS

PDF

72.4 KB Created: 2021-09-19 13:23:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 92845e007809fcc215079e161b68a27d SHA-1: f98c6f800b6796ff4a882fb21561cd345373a72e SHA-256: f89c810c918fdba92b755729a6ca115b63f80f5a6198d4c2f87cf791ef4a7ec3
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, many pointing to suspicious domains, suggesting a phishing or malware distribution scheme. The PDF structure and heuristic firings, such as PDF_SEO_DISPOSABLE_LINK_FARM, indicate a link farm designed to redirect users, likely to a malicious site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://orem.mn/uploads/files/tapemi.pdf In PDF document text
    • https://designclarf.it/file/guwezezosurijujunazit.pdfIn PDF document text
    • http://studiotecnicobergamaschi.it/userfiles/files/ziwedituvejopamizesotav.pdfIn PDF document text
    • https://998.geektic.com/geektic/files/pojumotaf.pdfIn PDF document text
    • https://gdaniec.com/upload/files/ziwadolux.pdfIn PDF document text
    • http://tabletopad.com/images/file/vasepabulobe.pdfIn PDF document text
    • http://cbcom.fr/ressource/site-image/files/68767633951.pdfIn PDF document text
    • https://pametnidom.hr/pametne_kuce/userfiles/file/wodugosewutomeko.pdfIn PDF document text
    • https://palcev.ru/userfiles/file/jugidevapijopimikuf.pdfIn PDF document text
    • http://vasilii-orlov.fun/wp-content/plugins/super-forms/uploads/php/files/3d89e83b039b1a6fa55ac4f8bf4651da/notekirivumukobikazora.pdfIn PDF document text
    • http://dj-maily.com/uploads/pages/files/zuwegutaxibor.pdfIn PDF document text
    • https://mujeresenmovimientoplus.com/userfiles/file/miwidefeboxigalivawin.pdfIn PDF document text
    • http://ansatrans.ru/admin/ckfinder/userfiles/files/lojekejemapodojorekujo.pdfIn PDF document text
    • http://szamosiszerviz.hu/feltoltott/files/dironuvomo.pdfIn PDF document text
    • http://master-br.ru/img/file/14578157218.pdfIn PDF document text
    • http://mrcubezpieczenia.pl/app/webroot/media/files/29095458740.pdfIn PDF document text
    • https://dbmotorbrokers.com/userfiles/file/lagutazajijasega.pdfIn PDF document text
    • https://partroyfuneralhome.com/partroy/assets/file/24790746834.pdfIn PDF document text
    • http://ecme.site/2015/vat/upload/files/74999937341.pdfIn PDF document text
    • http://rujiahk.com/uploadfiles/file/bumedadowibukekuda.pdfIn PDF document text
    • http://fgsconsulta.com.br/ckfinder/uploads/userfiles/files/watowebixunadapizanosel.pdfIn PDF document text
    • https://functionalmovement.gr/wp-content/plugins/super-forms/uploads/php/files/9b966a6fd6e5e17df9cdcf0424bb2fef/24633654222.pdfIn PDF document text
    • http://szpk.hu/_user/file/2674317148.pdfIn PDF document text
    • http://istanbulballoons.com/ckfinder/userfiles/files/19438027546.pdfIn PDF document text
    • https://otterdisplay.com/userfiles/file/miwevina.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=streaming+the+croodsPDF 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_off0000b843.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB843 10848 bytes
SHA-256: cb366f3ea69553abc1b52e8e69699a96eb5fb487b4c9aa723317fa7043260d14
font_01_sfnt_off0000d0e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD0E4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e8f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8F6 16616 bytes
SHA-256: d5ab5bb8cf2cd2a9e31d03bdf324e9200e6bdf78eb63796b795aaf83765c035f

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