Malicious PDF — malware analysis report

Static analysis result for SHA-256 1d1cf1b195f1f0d2…

MALICIOUS

PDF

79.9 KB Created: 2021-09-08 12:22:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: f4c212610b660a9530a3a4fa8b0983ba SHA-1: f24f03d5755cc7b89d90cba161771560f7485c54 SHA-256: 1d1cf1b195f1f0d2f1ca75f21c3aa66a7142524b7ef16689760ff4bf8a7a1122
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is a PDF with numerous embedded URLs, many of which point to suspicious domains and are flagged as a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, specifically phishing. While no scripts were directly extracted, the PDF structure and embedded links suggest it's designed to redirect users to malicious sites, likely for credential harvesting or further payload delivery.

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://tw-echen.com/uploads/files/202109080313382476.pdf In PDF document text
    • http://ty-int.com/files/files/77070871791.pdfIn PDF document text
    • http://poiskvod.ru/images/file/fifilor.pdfIn PDF document text
    • https://www.smartfutureexpo.com/ckfinder/userfiles/files/45418480959.pdfIn PDF document text
    • http://langeline.com/ckeditor/upload/files/30833310341.pdfIn PDF document text
    • http://geyikkimya.com/userfiles/upload/file/janutanejefi.pdfIn PDF document text
    • http://aexpress.lv/index/images/up/file/kejaf.pdfIn PDF document text
    • https://nabijdefossa.nl/upload/files/46784429495.pdfIn PDF document text
    • http://royalwedding.jp/images/blog/file/67383719742.pdfIn PDF document text
    • http://pnmanagementsolutions.in/uploads/kufefuker.pdfIn PDF document text
    • http://revize-elektro.info/UserFiles/File/sadasadizulireko.pdfIn PDF document text
    • http://staropolski.net/Upload/file/vexelutanazagagezaj.pdfIn PDF document text
    • https://jobtiara.com/files/files/36186322278.pdfIn PDF document text
    • http://cosyromania.com/media/file/97789221253.pdfIn PDF document text
    • http://stkvn.ru/wp-content/plugins/super-forms/uploads/php/files/f3733818476b0ac373820343a104d1fe/nexedekijugodudagogado.pdfIn PDF document text
    • http://khamtribacninh.com/images/files/71344881592.pdfIn PDF document text
    • http://grupposcorcia.it/userfiles/files/95818616594.pdfIn PDF document text
    • http://ladna.pl/user_images/file/juzimomode.pdfIn PDF document text
    • https://www.eos.org.eg/ckfinder/userfiles/files/4369544943.pdfIn PDF document text
    • http://prefinancovaniehypoteky.sk/res/file/dufezudoxibojiwuzewoga.pdfIn PDF document text
    • http://rowadhr.com/app/webroot/upload/files/borulerigepun.pdfIn PDF document text
    • http://tk-weld.com/images/library/File/40683460429.pdfIn PDF document text
    • https://hamzsabegi60szallo.hu/UserFiles/File/57323372152.pdfIn PDF document text
    • https://www.sidertest.it/wp-content/plugins/formcraft/file-upload/server/content/files/16131bbf381ef0---88863710519.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=2019+buick+encore+owner%27s+manual+pdfPDF 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_off0000d15d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD15D 11500 bytes
SHA-256: f6452e963891f234de77e5a519591d0facd57e9250172ee1a61357a0cf514e83
font_01_sfnt_off0000ec8c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC8C 17396 bytes
SHA-256: 4c5914454c6ac475ae527d650606df5e8c93dcff2911b3784d49b73990cdb59a
font_02_sfnt_off00011977.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11977 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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