Malicious PDF — malware analysis report

Static analysis result for SHA-256 e13f9dbfe3f1bf27…

MALICIOUS

PDF

76.1 KB Created: 2021-09-27 08:50:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: e473bbae91bbbd6b55526bbcde1391be SHA-1: 26027874ccd596fcc464332ba89c7f2918af8ed6 SHA-256: e13f9dbfe3f1bf27a0cfad77188c931158ac30a7b51788b3ff22ad50a18b8bd3
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external URIs and is flagged as a link farm on 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 presence of external links and the nature of the PDF heuristics point towards a malicious document designed to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://huntic.ru/uplcv?utm_term=dokkan+battle+jp+god+mode PDF link annotation
    • https://dovolena-jiznicechy.cz/uploads/22560966958.pdfIn PDF document text
    • http://feach.ie/images/uploads/file/42434989870.pdfIn PDF document text
    • http://jinistudy.com/_UploadFile/Images/file/27951405695.pdfIn PDF document text
    • http://gazosilikatnn.ru/uploads/files/fixonoluxapamifonikitip.pdfIn PDF document text
    • http://a-range.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1614e24e2acb16---42308696922.pdfIn PDF document text
    • http://annabarons.com/files/files/73789096505.pdfIn PDF document text
    • http://ephtour.com/FileData/ckfinder/files/20210905_DDF3D1994CB7492D.pdfIn PDF document text
    • http://americasbestwingspa.iorderfoods.com/uploads/files/5943993289.pdfIn PDF document text
    • http://rockefellersgold.hu/editor_up/31736911167.pdfIn PDF document text
    • http://pscemetery.com/userfiles/file/1403035460.pdfIn PDF document text
    • https://www.hauptsache.cc/wp-content/plugins/formcraft/file-upload/server/content/files/1613d2f4777448---32387599152.pdfIn PDF document text
    • https://sindonis.com/userfiles/file/38596392992.pdfIn PDF document text
    • https://yoimart.com/upload/file/20210921105024.pdfIn PDF document text
    • http://jump360.co/upload/files/20210905152135.pdfIn PDF document text
    • http://thaimassagemodel.com/ckfinder/userfiles/files/sopiruzunonerotimam.pdfIn PDF document text
    • http://www.sm.ac.th/ckfinder/userfiles/files/wetonuxatokemobodusapit.pdfIn PDF document text
    • http://studiozoppini.com/userfiles/files/lobegesoroket.pdfIn PDF document text
    • http://dolinakrzeptowa.pl/public/upload/ckfinder/userfiles/files/24975396767.pdfIn PDF document text
    • http://aotwresort.net/ckfinder/userfiles/files/38880878985.pdfIn PDF document text
    • https://www.institutvzdelavani.cz/files/divefozixixal.pdfIn PDF document text
    • https://chandrakantmusicacademy.org/ckfinder/userfiles/files/xokujizaxazokireda.pdfIn PDF document text
    • http://happyhanool.com/ckupload/files/buvijofipukoguj.pdfIn PDF document text
    • http://cafegreenwichvillage.com/uploads/files/59547003264.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_off0000bfe9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBFE9 19516 bytes
SHA-256: fed782a8d5833c962edea9d892e20cb1335a50e4ec9ae5a44b0fd7c142fc85f6
font_01_sfnt_off0000f290.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF290 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010aa7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10AA7 10740 bytes
SHA-256: 8ef3bfd84721be4b57c951e66c2714fee41a350a60be706a017820484481ed4c

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