Malicious PDF — malware analysis report

Static analysis result for SHA-256 e3084edfd23d8be4…

MALICIOUS

PDF

84.6 KB Created: 2021-09-21 08:25:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 0c24a0a69a7e7bc1c7b8f3158f15c596 SHA-1: 3baed269a09c8a1b34b064cc58ca0bc274a3644f SHA-256: e3084edfd23d8be40b754acd99a1a2c89cb876d8dabe69b123684ae931d5f51f
126 Risk Score

Malware Insights

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

The file was detected by ClamAV as Pdf.Phishing.Trojan and flagged by an ML classifier, indicating malicious intent. The PDF contains numerous embedded URLs pointing to external sites, many of which are hosted on disposable domains, suggesting a link farm or phishing lure. While no scripts were explicitly extracted, the PDF structure and heuristic firings strongly suggest it's designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9860

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://dichvumayphoto.vn/webroot/img/files/buvobujesumoxegunot.pdf In PDF document text
    • http://marktoby.com/akram/know_news/admin/userfiles/file/37424822118.pdfIn PDF document text
    • http://sp3siemianowice.pl/userFiles/files/9174822411.pdfIn PDF document text
    • http://cimkezes.hu/uploads/ckfinder/userfiles/files/68226789319.pdfIn PDF document text
    • https://gift-edu.ru/wp-content/plugins/super-forms/uploads/php/files/fe01f453769ee35fa7c57d6a1aeeb432/sidesumazabadibusuwifet.pdfIn PDF document text
    • http://mariopresto.pl/userfiles/file/35330960858.pdfIn PDF document text
    • http://burfel.ru/upfiles/files/xawujimadubezimamul.pdfIn PDF document text
    • https://vinadesigndanang.vn/uploads/image/files/veniwedumikaxaluguj.pdfIn PDF document text
    • https://livermore.com/wysiwygfiles/file/daran.pdfIn PDF document text
    • http://www.a-fairys-choice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c1915c6a79---numemozisabemu.pdfIn PDF document text
    • http://firegallery.ru/img/upload/82069640668.pdfIn PDF document text
    • http://evo-models.com/uploads/userfiles/files/63569074409.pdfIn PDF document text
    • http://myphamasia.net/upload/files/fifuxujuzomakem.pdfIn PDF document text
    • http://studioarchterreni.it/userfiles/files/gilulobaraxumib.pdfIn PDF document text
    • https://jlgardner.org/home/jlg/public_html/ckfinder/userfiles/files/tadulurewuzupilamavog.pdfIn PDF document text
    • http://mhfmjournal.com/data/22/2/55/64/2544879/user/2788947/htdocs/userfiles/file/ruvibuwosedo.pdfIn PDF document text
    • https://momentous-inst.com/uploads/image/files/17842684491.pdfIn PDF document text
    • http://aescantabria.es/upload/fckeditor/file///90790247604.pdfIn PDF document text
    • https://betamachinery.sa/other_files/File/lunefepepokugom.pdfIn PDF document text
    • https://casabresciani.it/uploads/file/44192212880.pdfIn PDF document text
    • https://maconlux.lu/userfiles/files/notopinutiza.pdfIn PDF document text
    • https://jurvamartin.com/userfiles/file/wokodasalukasofijiga.pdfIn PDF document text
    • http://wohntraumgmbh.at/35321483.pdfIn PDF document text
    • https://thisissati.com/userfiles/files/82446096898.pdfIn PDF document text
    • http://eptesteplelek.com/uploads/file/jipatemojapomigekaxovudit.pdfIn PDF document text
    • https://drosamahetta.com/userfiles/file/53288775234.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=iphone+birthday+calendar+reminderPDF 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_off0000e3af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3AF 18952 bytes
SHA-256: 40b03fe2683890fb7b3b6af7ae8079464f3d5cadb8105ea98e80a0bc21f366f5
font_01_sfnt_off00011459.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11459 10816 bytes
SHA-256: 9d0a9c1deecb5b6cee95ae86fe4df7e9cacf45060a6c3d94fd80d49ddcf7a566
font_02_sfnt_off00012cde.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12CDE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1