Malicious PDF — malware analysis report

Static analysis result for SHA-256 9a4e7600f8ef59fa…

MALICIOUS

PDF

79.2 KB Created: 2021-09-17 08:37:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: f6f11b7f5f793133205c263070c008ba SHA-1: 9ce96aac0da05263e6648e85b0b9d2e2d33d58d4 SHA-256: 9a4e7600f8ef59fae0af9462bf091c7ffb4e8947d6da9fd37c552bf9ece6f65b
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external URLs, many of which are associated with link farms and disposable hosting, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. Although no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a malicious document designed to lure users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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://synerhu.ru/uplcv?utm_term=advance+car+parking+game+download PDF link annotation
    • https://eobliecky.sk/userfiles/file/31805995875.pdfIn PDF document text
    • http://meskerjager.nl/media/files/dalewewapip.pdfIn PDF document text
    • http://recruiters-zone.com/wp-content/plugins/formcraft/file-upload/server/content/files/161327be5b5938---kofoferuzamodiburexesad.pdfIn PDF document text
    • http://de-ko-gmbh.com/ckfinder/userfiles/files/13481408774.pdfIn PDF document text
    • https://stotex.rs/files/mobapelopadatepipamo.pdfIn PDF document text
    • https://bem-sa.com/img/file/tewanagekafanobuwapej.pdfIn PDF document text
    • https://salwangurugram.com/files/mujopututexujorirepubi.pdfIn PDF document text
    • https://impulsa.mantareys.net/uploads/plantillas/files/kejununufebejebitu.pdfIn PDF document text
    • http://yjccnc.com/upload/files/guzafofewewenikobisowam.pdfIn PDF document text
    • http://sjhtractor.com/d/files/39220792696.pdfIn PDF document text
    • https://die-elke.de/cms/elke_page_files/file/mafitawujepifa.pdfIn PDF document text
    • http://zekejozsef.eu/FCKfeltoltott/file/19432381967.pdfIn PDF document text
    • https://alternativi.brtim.com/uploads/wysiwyg/files/fizalapokok.pdfIn PDF document text
    • http://innospectrum.eu/hirlevel/file/91910204957.pdfIn PDF document text
    • http://wonderful-foods.net/userfiles/file/dedopinegibazawo.pdfIn PDF document text
    • https://inoxquochoang.com/app/webroot/files/images/pages/files/24637234109.pdfIn PDF document text
    • https://goactive.hu/wp-content/plugins/super-forms/uploads/php/files/95eed6dfd6d522cb0ea7f4003a64c52a/30302181676.pdfIn PDF document text
    • http://yournamebadges.com/withyourdog/cms_uploads/file/jakofibosebikiduvif.pdfIn PDF document text
    • http://alfatreyd-mebel.ru/archive/images/file/58189938971.pdfIn PDF document text
    • http://dgjst.com/upfile/file/38628049740.pdfIn PDF document text
    • http://loadcell.vn/Images_upload/files/24846859903.pdfIn PDF document text
    • http://oa30us.com/userfiles/file/subunovi.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_off0000cf04.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF04 18472 bytes
SHA-256: 25b772bc7659be30dadd92e0b96e662ec16872dd6a82b974f9f536e77030e372
font_01_sfnt_off0000fea1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEA1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000116b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x116B8 10816 bytes
SHA-256: 4773a0a0bf3ba9b6d3e5769b097ddc4094229ecb52b2c7bd30232f2af6b6fd1b

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