Malicious PDF — malware analysis report

Static analysis result for SHA-256 4dd518417f4d5788…

MALICIOUS

PDF

63.8 KB Created: 2021-09-25 01:59:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: c20da08d2d255ce47d7e37173d12ff86 SHA-1: eaff24ebc512ea355c3e9b35032a4aa4cbf6924e SHA-256: 4dd518417f4d5788c84e3af531279778f861195d6f37e5bf4bba5a8361b4fb2e
124 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was detected as malicious by ClamAV and an ML classifier. It contains numerous embedded URLs, many of which point to suspicious domains and are likely part of a link farm designed to obscure the true destination. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a high likelihood of malicious intent, such as phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.5661

Heuristics 4

  • 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.
  • 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 https://valserve.in/web/k/main_admin/ckfinder/userfiles/files/niduvokomokonikuwozevuzu.pdf In PDF document text
    • https://jbdclothiers.net/emailer/userfiles/file/41642877221.pdfIn PDF document text
    • http://ccswcd.com/userfiles/file/podelexagijuta.pdfIn PDF document text
    • https://fminterativa.net/cms/plugins/ckfinder/userfiles/files/68119122132.pdfIn PDF document text
    • http://kvarkeno56.ru/userfiles/file/46136846295.pdfIn PDF document text
    • https://www.profiemg.cz/upload/ck/files/rexepuvugevipujofuwubibim.pdfIn PDF document text
    • http://ecohort.com/userfiles/files/84580632481.pdfIn PDF document text
    • http://projecthouse.bg/uploads/CKfinder/files/repojuz.pdfIn PDF document text
    • http://ukwoodrecycling.com/userfiles/files/59045769087.pdfIn PDF document text
    • https://khmernative-rice.com/userfiles/file/nupajuz.pdfIn PDF document text
    • http://www.kickcommerce.com/userfiles/file/gifavagawufubitito.pdfIn PDF document text
    • http://datev.hu/ckfinder/userfiles/files/muxopuwamujegopobut.pdfIn PDF document text
    • https://www.cylinder96.ru/admin/ckfinder/userfiles/files/banole.pdfIn PDF document text
    • http://tbvshungviet.com/upload/files/geduxaxirobebekarufo.pdfIn PDF document text
    • http://www.gradur.ba/wp-content/plugins/formcraft/file-upload/server/content/files/161433c3d88a7d---moburumetem.pdfIn PDF document text
    • http://www.biogreeno.com/cms/ckfinder/userfiles/files/25462953935.pdfIn PDF document text
    • http://instit.ac/ckfinder/userfiles/files/23007798755.pdfIn PDF document text
    • http://zzquansu.cn/d/files/dogejejapagoxejijew.pdfIn PDF document text
    • http://maschimaurizio.it/userfiles/files/puzuwetofasinimubopu.pdfIn PDF document text
    • https://zhbiotech.com/CKEdit/upload/files/tifeliniretewizekoluxot.pdfIn PDF document text
    • http://veterinariogiardinelli.it/userfiles/files/17888583257.pdfIn PDF document text
    • http://tehnicgaz.eu/files/file/62843941891.pdfIn PDF document text
    • http://vxclouds.com/userfiles/file/7934482447.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=std+12+biology+textbookPDF link annotation
    • http://s250801404.onlinehome.fr/img/uploaded/file/33677327415.pdfIn PDF document text
    • 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_off0000bc63.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBC63 10584 bytes
SHA-256: 29c6635c47879e0b488d25d116da37f5b60d69600d705d9e7b632c12e768ce73
font_01_sfnt_off0000d48c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD48C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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