Malicious PDF — malware analysis report

Static analysis result for SHA-256 8e6972112f18aef0…

MALICIOUS

PDF

71.2 KB Created: 2021-09-28 16:20:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 08d705e4f7c2f36306e76b2636f2ea15 SHA-1: 365e08c6271b7d5ae7c8b47ea245d4c4a18ea8b0 SHA-256: 8e6972112f18aef0573558941389930244fa993b26531823180fa7c244a04600
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF document was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs pointing to disposable domains, indicating a link farm designed to redirect users. While no scripts were explicitly extracted, the PDF structure and heuristic firings strongly suggest it's part of a phishing campaign or a downloader for further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 5

  • 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
  • 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://geometramaurotozzi.it/userfiles/files/20794699416.pdf In PDF document text
    • http://yaqeen-eg.com/userfiles/file/55867771146.pdfIn PDF document text
    • http://cu-hinothai.com/ckfinder/userfiles/files/ligawufuvipix.pdfIn PDF document text
    • https://connatlas.com/home/conn/public_html/ckfinder/userfiles/files/nuwovo.pdfIn PDF document text
    • https://getadoc.in/ckfinder/userfiles/files/69838597278.pdfIn PDF document text
    • https://ceccardolj.ro/userfiles/file/40786472791.pdfIn PDF document text
    • https://next-engineering.com/userfiles/files/58948421077.pdfIn PDF document text
    • https://go2germany.ru/files/file/vegim.pdfIn PDF document text
    • http://geluidsadviesnederland.nl/ckfinder/userfiles/files/mekatutomij.pdfIn PDF document text
    • http://boonfagrandhome.com/user_img/files/98444604953.pdfIn PDF document text
    • http://igigeothermal.jp/userfiles/file/17260055752.pdfIn PDF document text
    • http://soleilboo.com/images/uploads/files/fijiwerabiku.pdfIn PDF document text
    • http://abwalabamaave.com/uploads/files/7097061282.pdfIn PDF document text
    • https://srldirect.com/ckfinder/userfiles/files/wasulu.pdfIn PDF document text
    • http://vidiniaibreketai.lt/userfiles/file/71633931898.pdfIn PDF document text
    • http://rbc-bezorgdiensten.nl/upload/vogavubixipefam.pdfIn PDF document text
    • http://patanjali.zohukum.com/ckfinder/userfiles/files/lubirejidipemumodanutane.pdfIn PDF document text
    • https://olterus.info/contents/files/zekenaxuwelorafuza.pdfIn PDF document text
    • http://themetamorphoseprogram.com/userfiles/file/4832967101.pdfIn PDF document text
    • http://esejsc.com/upload/files/loxiw.pdfIn PDF document text
    • https://www.ijestr.com/ckfinder/userfiles/files/16662569545.pdfIn PDF document text
    • https://spbmworld.com/anaeter_capital/siteadmin/userfiles/files/15834767352.pdfIn PDF document text
    • https://mihalex.by/files/files/wuwuruzevemujuvijosabo.pdfIn PDF document text
    • http://fcraregistration.com/UploadedData/file/5157313457.pdfIn PDF document text
    • http://xn--aknmedcal-wpbe.com/uploads/file/21822584852.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=how+to+copy+text+from+android+to+pcPDF 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_off0000b421.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB421 16468 bytes
SHA-256: 2848426d3dd4a42f0f8d94c361a1a07c28d595268080fbba834422f3a8a736a8
font_01_sfnt_off0000ddb1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDB1 10860 bytes
SHA-256: e5ac56eaeff0ab01de9f09f18c568b74c4aa082109d74dc334cb7fa68f9218ea
font_02_sfnt_off0000f6d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6D0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1