Malicious PDF — malware analysis report

Static analysis result for SHA-256 db78f724dc3ebb00…

MALICIOUS

PDF

82.0 KB Created: 2021-09-17 22:05:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 2646ab6e20d6759b34ffb1e9ad0b7818 SHA-1: 679342ff13ce83fa57db1f416eeff03a5b9be1f9 SHA-256: db78f724dc3ebb00c23e52c38141a083ad1a221c6dc623334dd66e6ce020be08
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to disposable hosting and are part of a link farm, suggesting a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were directly extracted, the PDF structure and URL patterns are consistent with attempts to trick users into downloading further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 6

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://atomleasing.ru/media/File/datuwivofovuxed.pdf In PDF document text
    • http://nanouklid.cz/upload/file/sovabunivagisov.pdfIn PDF document text
    • https://khotelmarket.com/FileData/ckfinder/files/20210915_B2A7DCC48C00CF18.pdfIn PDF document text
    • http://deurenhanger.nl/userfiles/file/defijul.pdfIn PDF document text
    • https://youkuvpn.com/upload/files/kixojolesiwewovu.pdfIn PDF document text
    • http://kpdb.org/userfiles/files/segivikevelimilew.pdfIn PDF document text
    • https://www.dazzlingdecor.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16137fde7b7019---worepelofemevoneruduf.pdfIn PDF document text
    • https://alshamiltrading.com/alshamilfiles/file/83880577263.pdfIn PDF document text
    • http://www.neoneophytou.com/ckfinder/userfiles/files/65125212107.pdfIn PDF document text
    • http://archidaldegan.eu/userfiles/files/biwutakujikijebawatovubom.pdfIn PDF document text
    • http://styropapex.pl/userfiles/file/fipevinesipifo.pdfIn PDF document text
    • https://xulynuocphangiathinh.vn/images/pic/file/tatolofebesagajefekavu.pdfIn PDF document text
    • http://www.malagatour.es/ckfinder/userfiles/files/gafuposalufe.pdfIn PDF document text
    • https://essaidafm.com/uploads/FCK_files/file/xawizerafuk.pdfIn PDF document text
    • https://franchisebusinessadvisors.franchisebrokerwebsites.com/broker-site/files/files/levifabufunavajidinitoxi.pdfIn PDF document text
    • http://2017.letnifestiwal.pl/ckfinder/userfiles/files/61703186514.pdfIn PDF document text
    • http://hitelesen.com/userfiles/file/jowofazafekagamilemad.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132c1d319064---39962755379.pdfIn PDF document text
    • https://yuvasarkar.org/userfiles/file/wakosupafoxawumidojoz.pdfIn PDF document text
    • https://cuatudongbinhduong.net/uploads/files/lexagomamenisigosabedi.pdfIn PDF document text
    • http://himalayakebab.com/shipinc/userfiles/files/ketiwekiwudakuxot.pdfIn PDF document text
    • https://broadcasthub.com/ci/userfiles/files/41413134179.pdfIn PDF document text
    • http://awards.nl/img/cms/file/vafifarefegudin.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=download+the+escapists+2+apk+androidPDF 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_off0000da65.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA65 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f277.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF277 17824 bytes
SHA-256: 1c880034e5cbb3d485bdeb28473f9c8ed60358e62dd3292d0049a22c406903ad
font_02_sfnt_off000120b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x120B6 10908 bytes
SHA-256: 700d6b1450546bc46a498e528d845be167536c7a1069ce00fdcc44358c1d662d