Malicious PDF — malware analysis report

Static analysis result for SHA-256 d24e660bccec06b5…

MALICIOUS

PDF

67.7 KB Created: 2021-09-28 08:48:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: c095a43c6420950bb4e402d299e50302 SHA-1: e61dfaa51532b5bc4e6a591d76496971fc788a34 SHA-256: d24e660bccec06b5a2a60cf2c430975b2cb6a908a90e27f11317a4ded4b79628
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains numerous external URIs and is identified as a link farm hosted on disposable domains, suggesting a phishing or malware distribution scheme. Although no scripts were explicitly extracted, the PDF structure and numerous embedded URLs point towards an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9966

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://medvor.ru/uplcv?utm_term=free+premium+tv+apk PDF link annotation
    • http://harlit.com/upfiles/file/kalap.pdfIn PDF document text
    • https://www.kuwaitpolyurethane.com/ckfinder/userfiles/files/laraxu.pdfIn PDF document text
    • https://bnbtravels.com/ckfinder/userfiles/files/63846508244.pdfIn PDF document text
    • https://demoepaper.104portal.com/upload/serback/files/20210924065037.pdfIn PDF document text
    • http://okun.su/upload/file/7604711584.pdfIn PDF document text
    • https://tutorlookup.com/ckeditor/ckfinder/userfiles/files/38199346276.pdfIn PDF document text
    • http://dija.lv/public/userfiles/file/7935143197.pdfIn PDF document text
    • http://mindentudor.hu/userfiles/file/sulegosilizomiremal.pdfIn PDF document text
    • http://dallard.fr/ressource/site-image/files/53505647479.pdfIn PDF document text
    • http://msslink.ru/userfiles/files/vemopiji.pdfIn PDF document text
    • https://zniczekowalczyk.com/user_images/file/zetijojadujupevuso.pdfIn PDF document text
    • https://microfocus-realize2020mea.com/wp-content/plugins/super-forms/uploads/php/files/0bb99e49f0eb3f3c13d3eafb9654c15b/73234688107.pdfIn PDF document text
    • http://855solution.com/htdocs/cljr/data/files/46009002354.pdfIn PDF document text
    • http://c2r.su/uploadfiles/file/2021091104430273499.pdfIn PDF document text
    • https://ourlady-schools2.com/userfiles/files/26480009575.pdfIn PDF document text
    • https://esteticarcare.com/wp-content/plugins/super-forms/uploads/php/files/7ebe0cbc1e249ba15438a73f584c8f59/dakogigonusobow.pdfIn PDF document text
    • https://cooperadora.grupocreartel.com/documentos/archivos/rusoxuxejoz.pdfIn PDF document text
    • https://metricgroup.it/uploads/file/pitigizakelute.pdfIn PDF document text
    • https://glaze-metalart.com/upload/files/pamamogenokijeruvinez.pdfIn PDF document text
    • http://tamtamphat.com/upload/files/vusunijeletekipive.pdfIn PDF document text
    • http://scarpatti.com/files/jogexizilapejigutivupug.pdfIn PDF document text
    • http://bienchidan.org/uploads/files/28057865144.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_off0000acd8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xACD8 14912 bytes
SHA-256: 92aa526e4b798db156833ff204b7412e8f990d83c40d77bd4e5303f6a6d0ecbd
font_01_sfnt_off0000d2a0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD2A0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000eab7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAB7 10208 bytes
SHA-256: c8722e80cd92c1b1a406a0fbf090d0bb6c635222b0d7d4daabbba7ca4be06f8e

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