Malicious PDF — malware analysis report

Static analysis result for SHA-256 d3e6a3a598b0033e…

MALICIOUS

PDF

75.4 KB Created: 2021-09-24 04:21:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: dd6ac12557c7021d2ffca1f1414c70c0 SHA-1: 70b41de0a8f9ec34559797992691c2ba809e1066 SHA-256: d3e6a3a598b0033e76c7daf3ea5846d5bcd151a26ae91b078d0292c6a9165827
66 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to disposable domains and are structured as link farms, indicating a potential SEO manipulation or redirection scheme. The ML classifier strongly flagged this PDF as malicious, and the presence of external URIs suggests it's designed to lead users to potentially harmful content. No scripts were extracted from this sample, limiting the ability to determine specific execution methods.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

Heuristics 4

  • 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://siemreaptraveltours.com/userfiles/file/52479811177.pdf In PDF document text
    • http://tcihk.com/userfiles/fajet.pdfIn PDF document text
    • http://1yunnan.com/ckfinder/userfiles/files/pezuzaboxibu.pdfIn PDF document text
    • https://qud27rxl1-k61l.com/contents/files/bejuwitugurodamojesinuko.pdfIn PDF document text
    • http://protok.pro/upload/files/fukemano.pdfIn PDF document text
    • http://www.hcibatiment.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1614d00e4cf4e9---88900617257.pdfIn PDF document text
    • https://qboardapp.com/wp-content/plugins/super-forms/uploads/php/files/13d9a15f8e7a71996e7cbc0c31307a52/67511803037.pdfIn PDF document text
    • http://xn----ctbguteehkho5h.xn--p1ai/ckfinder/userfiles/files/66303530358.pdfIn PDF document text
    • http://civicwomen.com/ckfiles/files/ranulixige.pdfIn PDF document text
    • https://il-gusto.com/images/file/76328971466.pdfIn PDF document text
    • http://effektfilm.de/files/file/92178390762.pdfIn PDF document text
    • http://www.deopendeur.org/imgUser/file/66203871823.pdfIn PDF document text
    • http://eventclub.pl/userfiles/file/65964853385.pdfIn PDF document text
    • https://www.privathospitaletkollund.com/ckfinder/userfiles/files/21685055125.pdfIn PDF document text
    • https://gibidesign.com/fckfiles/file/tefiv.pdfIn PDF document text
    • https://bc2000.order-pro.com/ckfinder/userfiles/files/69787794600.pdfIn PDF document text
    • http://gattoneva.pl/pages/userfiles/file/vesedotedusok.pdfIn PDF document text
    • http://happysmilecard.com/uploads/files/jedifeboforazoleki.pdfIn PDF document text
    • http://asavn.vn/uploads/userfiles/files/72362352978.pdfIn PDF document text
    • http://fpempresa.cen.es/userfiles/files/wuxixozudaj.pdfIn PDF document text
    • http://jinistudy.com/_UploadFile/Images/file/mokibijelusezep.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=indian+idol+12+ka+winnerPDF 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_off0000c106.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC106 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d918.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD918 18424 bytes
SHA-256: ad32c6b01cf5bb85f09e7655fd0ec2559986c094b8dea5d2e7ad63fc585e7113
font_02_sfnt_off000108d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108D5 10276 bytes
SHA-256: c58dd048b44407baa658188770675cce550337e9cb4ec80aa325a21f5fe3a099

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