Malicious PDF — malware analysis report

Static analysis result for SHA-256 4079127687386427…

MALICIOUS

PDF

72.3 KB Created: 2021-09-14 13:44:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: d5cdc7d775843ffc54f2692aa0e03656 SHA-1: 4fcc710fc20385df24d405254e85ebaba13877f2 SHA-256: 40791276873864276e16eeb0d5f02280f81ed503aac57e529ad3a61dc046e2f3
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier indicating maliciousness. The presence of a link farm with numerous distinct hosts suggests an attempt to direct users to potentially malicious websites. While no scripts were directly extracted, the PDF structure and embedded URIs point towards a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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 http://stauarchitetti.eu/userfiles/files/97563354818.pdf In PDF document text
    • http://jeanchapleau.com/userfiles/file/puzuvubatafuxetaga.pdfIn PDF document text
    • https://bushregenerators.com/userfiles/files/vusuxibu.pdfIn PDF document text
    • https://vcvscr.cz/www/www/fckphotos/file/tefefa.pdfIn PDF document text
    • http://geoman.cz/data/file/98827680332.pdfIn PDF document text
    • http://iccjsc.vn/images/uploads/files/radukogunoxefotu.pdfIn PDF document text
    • https://rheinfurth.de/userfiles/file/linasuliki.pdfIn PDF document text
    • http://antropolog.ru/userfiles/file/bafuw.pdfIn PDF document text
    • https://aluminiosarla.com/userfiles_arla/files/kubamu.pdfIn PDF document text
    • https://flour.co.uk/ckfinder/userfiles/files/54711537273.pdfIn PDF document text
    • http://huijingweb.com/upload_fck/file/2021-9-5/20210905083502216708.pdfIn PDF document text
    • https://steklo-shik.ru/userfiles/file/82521481639.pdfIn PDF document text
    • https://norservis.info/files/files/31611191903.pdfIn PDF document text
    • http://kerekesvillszer.hu/UserFiles/file/sibalufetomizez.pdfIn PDF document text
    • http://cgemfoco.com.br/ckfinder/userfiles/files/25627443155.pdfIn PDF document text
    • https://www.prowallpanama.com/wp-content/plugins/super-forms/uploads/php/files/58d934eadd109682583822967698a6d2/vebepowumagaxuz.pdfIn PDF document text
    • http://qlionshousing.ca/userfiles/file/sapoxil.pdfIn PDF document text
    • http://rebizplus.com/userfiles/file/jevez.pdfIn PDF document text
    • http://j-club.eu/userfiles/file/gizegamuzivo.pdfIn PDF document text
    • http://mtecommerce.it/public/news/file/28477786198.pdfIn PDF document text
    • https://www.crossfitparamaribo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132e678a0f9e---badoxivewajolosifapaxe.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=swords+and+sandals+8PDF 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_off0000bac3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBAC3 10288 bytes
SHA-256: 46d5b154494aa20bb792752a3ccce14da287252a72ae310a13c1a0a75f3471de
font_01_sfnt_off0000d207.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD207 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000ea19.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA19 16096 bytes
SHA-256: bdb2ccfc79273d3a1b2fcccceae57fd2c3726f9bcf97eaaccd21fd96068e9774

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