Malicious PDF — malware analysis report

Static analysis result for SHA-256 fdf6dcfd3f1b7622…

MALICIOUS

PDF

85.3 KB Created: 2021-09-18 15:54:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 5ce3ae1186108c40e25fdfb2a0d3ead0 SHA-1: 2e163467cc69e90f6187ccddc6384ae62344533b SHA-256: fdf6dcfd3f1b762277b489ba5b8f5420e5bd464416603fece220d140be117d68
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains numerous links pointing to disposable domains, characteristic of a link farm used for phishing or distributing further malware. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' specifically flags this behavior, suggesting the document's primary purpose is to redirect users to potentially harmful sites.

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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://tuecpa.com/file_media/file_image/file/4927744108.pdf In PDF document text
    • https://lienlacanien.com/img_pages/file/22167148055.pdfIn PDF document text
    • http://agataklimowska.pl/userfiles/file/28351502058.pdfIn PDF document text
    • http://viral-list-monster.com/ckfinder/userfiles/publics/files/gidomekisavigined.pdfIn PDF document text
    • http://dubossari.es-pmr.com/constructor/dubossari/ckfinder/userfiles/files/94835516871.pdfIn PDF document text
    • http://dobryremont.pl/ebobas/portal/app/webroot/img/tmp/file/16308206915188.pdfIn PDF document text
    • https://parc-hotel.info/file/83025608957.pdfIn PDF document text
    • https://almuhja.ps/ckfinder/userfiles/files/24021777662.pdfIn PDF document text
    • http://mcrlclient.gilcom.ro/ckfinder/userfiles/files/pofezenuzexezowawunire.pdfIn PDF document text
    • https://noble-worldwide.com/wp-content/plugins/super-forms/uploads/php/files/dc81898cb142202f10470a6d4ba99fe1/jasipufij.pdfIn PDF document text
    • http://happyorderfood.com/uploads/files/66238517700.pdfIn PDF document text
    • http://www.gieskestukadoors.nl/ckfinder/files/files/vajuledasofesi.pdfIn PDF document text
    • http://ocean-ex.com/images/blog/file/dikuw.pdfIn PDF document text
    • http://macautemple.com/userfiles/file/15214089772.pdfIn PDF document text
    • https://hotnewsmd.deca.md/upload/userfiles/files/607334124.pdfIn PDF document text
    • http://wanyuantemple.tw/userfiles/file/musuzanemunilorowivub.pdfIn PDF document text
    • https://serviceelectric.ca/userfiles/file/49818299005.pdfIn PDF document text
    • http://xahscw.com/userfiles/file/bonilorebajudan.pdfIn PDF document text
    • https://dhesient.com/media/21384128152.pdfIn PDF document text
    • https://cobrawire.com/userfiles/files/sikizufazijanerov.pdfIn PDF document text
    • http://worthingtonpark101.com/userimages/74524633807.pdfIn PDF document text
    • http://riskhedgetech.com/uploaded/file/1146792813612f94946d9c6.pdfIn PDF document text
    • https://comodee.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613f95d9a2fb7---vixezinizufo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=pixel+cut+app+for+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_off0000e5f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5F5 10648 bytes
SHA-256: af25e518ab0d08e796081bf0a7d5f00cb7da9f4a816850c9ca4c32d10eaae515
font_01_sfnt_off0000fe7a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE7A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001168c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1168C 18640 bytes
SHA-256: 39548b81cd9ba5223e5dc0103b0298a61210aa78bb2253501ce7fefdc143ded4