Malicious PDF — malware analysis report

Static analysis result for SHA-256 a48bf0f8958e1bfd…

MALICIOUS

PDF

74.8 KB Created: 2021-09-24 09:45:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: eb0981afed318f0eb636ce35774b9759 SHA-1: 9152c89f325cab7121f5657a9f6b871a9e3d872a SHA-256: a48bf0f8958e1bfde3cdc9ea7f041fbef61ca5068d6ccbc9a36ac26258bb6425
124 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by multiple heuristics, including ClamAV and an ML classifier, indicating malicious intent. It contains numerous embedded URLs, many pointing to potentially disposable domains, suggesting a link farm designed to redirect users. The presence of PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports this, indicating a tactic to obscure the true destination or distribute multiple malicious links. No scripts were extracted, but the overall structure and URL distribution point towards a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.6657

Heuristics 4

  • 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
  • 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://preciz.com/uploads/wysiwyg/files/69153509100.pdf In PDF document text
    • https://middletonchambers.com/ckfinder/userfiles/files/5678139743.pdfIn PDF document text
    • https://tecsal.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16144b595e48b8---xajuxogibajevivi.pdfIn PDF document text
    • http://pactolous.hu/upload/file/36405720778.pdfIn PDF document text
    • https://ketex.com/trcgp/ckfinder/userfiles/files/89073863478.pdfIn PDF document text
    • http://vdi.vn/userfiles/file/tofalezidi.pdfIn PDF document text
    • http://omeofest.eu/userfiles/files/23130038495.pdfIn PDF document text
    • http://ibb-online.ru/f/file/16395085951.pdfIn PDF document text
    • https://nusbetaja2.com/contents/files/toxobiwedumef.pdfIn PDF document text
    • https://tidurmalam2.com/contents/files/2110378365.pdfIn PDF document text
    • http://smartmedicaleg.com/wp-content/plugins/formcraft/file-upload/server/content/files/161378cd373e51---43812276054.pdfIn PDF document text
    • http://marketingnews.fr/images/file/solikewabudada.pdfIn PDF document text
    • http://iraneto.com/basefile/iranetocom/files/pebekutawibejesuguvabe.pdfIn PDF document text
    • https://at-studio.tw/app/webroot/userfiles/files/20210923_031515.pdfIn PDF document text
    • http://netcentricnj.com/ckfinder/userfiles/files/25058163780.pdfIn PDF document text
    • https://faguaflowers.com/images/admin/file/57325303795.pdfIn PDF document text
    • https://558com.vegner.com/userfiles/files/20210916_081856.pdfIn PDF document text
    • http://ldksolar-officialliquidation.com/userfiles/files/dugezurafivobul.pdfIn PDF document text
    • http://timeyear-v.com/userfiles/file/wumujumopar.pdfIn PDF document text
    • http://gzky.cn/dubeite/ckfinder/userfiles/files/20210906_130317.pdfIn PDF document text
    • http://vipnjl.com/userfiles/files/22237763809.pdfIn PDF document text
    • http://cokhilegia.com/upload/files/dalubabiju.pdfIn PDF document text
    • http://imobilestore.de/userfiles/file/xivapagazem.pdfIn PDF document text
    • https://assignmentmart.com/ckfinder/userfiles/files/47433433077.pdfIn PDF document text
    • http://sgrappresentanze.eu/userfiles/files/lugugifuzipudawosezetig.pdfIn PDF document text
    • http://aceonlinementors.com/userfiles/file/48025608504.pdfIn PDF document text
    • https://vgi-vn.vn/app/webroot/img/files/dutabikafuxotapop.pdfIn PDF document text
    • http://breakevenpoint.pl/uploads/editor/file/30655860927.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=noise+apk+downloadPDF link annotation
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d928.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD928 10344 bytes
SHA-256: a6acbfa727dbaef72653e8271528021327c227a49b12697b4c60da1dc6679ff7
font_01_sfnt_off0000f0ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0AD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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