Malicious PDF — malware analysis report

Static analysis result for SHA-256 fdef96f5589aa3b9…

MALICIOUS

PDF

68.1 KB Created: 2021-10-01 21:46:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 85269d4cbab09bca35c50f8890d8de0d SHA-1: 95347c9dfa55b9f4d10ae4e19912a8ee375f963f SHA-256: fdef96f5589aa3b90f2a6aa89e3bdc875815ef6ab2fbee7eb1cf8da351328539
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a high number of embedded URIs and is flagged by ClamAV as a phishing trojan. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a deliberate attempt to create a large number of links on disposable hosting, suggesting a phishing or spamming operation. While no scripts were explicitly extracted, the nature of the embedded links points towards malicious redirection.

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://archism.ru/uplcv?utm_term=aplicaciones+excelentes+para+android PDF link annotation
    • http://sartoriaventurini.com/userfiles/files/suvunutufa.pdfIn PDF document text
    • http://www.slappedtogether.com/editoruploadfiles/file/11163262450.pdfIn PDF document text
    • https://investmentskillsgroup.com/images/userfiles/file/61745301691.pdfIn PDF document text
    • https://rusepress.com/uploads/wysiwyg/files/xagamu.pdfIn PDF document text
    • http://maryalo.com/userData/board/file/senerulerejapuribomaruf.pdfIn PDF document text
    • http://m-camper.ru/ckfinder/userfiles/files/30693924064.pdfIn PDF document text
    • http://www.champcaregivers.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130ccee792e3---7682276274.pdfIn PDF document text
    • https://cooperadora.grupocreartel.com/documentos/archivos/powerozekalok.pdfIn PDF document text
    • http://ykzn8.com/upfiles/editor/files/27462346917.pdfIn PDF document text
    • http://ufcnagykanizsa.hu/userfiles/file/58720477921.pdfIn PDF document text
    • http://nicenpos.com/userData/board/file/dibuw.pdfIn PDF document text
    • http://thetestmag.com/userfiles/files/fajufumi.pdfIn PDF document text
    • http://biaikatolikus.hu/files/file/votuva.pdfIn PDF document text
    • http://www.sanjuktabanerjee.com/fckimages/file/xodivodonubigutuwegali.pdfIn PDF document text
    • http://ver9ctrl.sonikgps.com/ckfinder/userfiles/files/fiwajur.pdfIn PDF document text
    • https://tekstilkentrehber.com/upload/ckfinder/files/pakelozunazasuked.pdfIn PDF document text
    • https://datajournonepal.org/files/subaxumasotedovabaxum.pdfIn PDF document text
    • https://linhngapt.vn/upload/files/51978010774.pdfIn PDF document text
    • http://ideatity.com/ckfinder/userfiles/files/gigezivovupomamowisej.pdfIn PDF document text
    • http://jlm-kg.com/uploads/file/22002222725.pdfIn PDF document text
    • http://fujiya-burbank.com/uploads/files/18953355133.pdfIn PDF document text
    • http://jiachuankeji.com/upload_fck/file/2021-9-16/20210916213344989796.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_off0000acb3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xACB3 10592 bytes
SHA-256: 0ce58dead77db58f1836d4f677566fdb12768695c3ca29139f8d62b8606fb0fc
font_01_sfnt_off0000c510.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC510 14880 bytes
SHA-256: 3f60dadf47b6d36d037e5becc71f9f1ed63c8506f156beb9c027f36d00b39524
font_02_sfnt_off0000eb09.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB09 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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