Malicious PDF — malware analysis report

Static analysis result for SHA-256 4224c1848bfe76e2…

MALICIOUS

PDF

70.3 KB Created: 2021-09-26 18:48:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 3c7abbd2344eb2d4098e08e074b1846f SHA-1: 946d7b621a36f75bebfb0d30c05f7aa9dfce5328 SHA-256: 4224c1848bfe76e220c6be13e0951d08378d54bf912dd1b66c53f86ee19f77b3
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The PDF contains numerous embedded links, many pointing to potentially disposable domains, suggesting a link farm or phishing lure. The presence of PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports this, indicating the document is designed to host many links on such domains. No scripts were extracted, but the overall structure points to a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • 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
  • 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 https://bahamianbrewery.com/ckfinder/userfiles/files/sefenoditunigukigo.pdf In PDF document text
    • https://pelicanfinancialnetwork.net/ckfinder/userfiles/files/25797940297.pdfIn PDF document text
    • http://knipia.com/userfiles/file/78303712700.pdfIn PDF document text
    • http://www.pattyn360.com/upload/forum/files/42073466761.pdfIn PDF document text
    • https://apexforestservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131c2fe99996---35323374376.pdfIn PDF document text
    • http://intranet.uts.edu.co/portal/app/ckfinder/userfiles/files/kalov.pdfIn PDF document text
    • https://nordiskvillaventilation.dk/userfiles/file/37875189811.pdfIn PDF document text
    • http://sushrutproctology.org/ckfinder/userfiles/files/26617591705.pdfIn PDF document text
    • http://mynigaoe.com/upload/file/20210914161856.pdfIn PDF document text
    • https://wlao.on.ca/wp-content/plugins/super-forms/uploads/php/files/7b5582ef91c8b8fa34d9729a75865fd9/nutisibezexowomimekoseba.pdfIn PDF document text
    • http://intertravel.hu/_user/file/38616091615.pdfIn PDF document text
    • http://akcjonariusz.com/UserFiles/file/xizukemepulizitudowabupex.pdfIn PDF document text
    • http://harasim.cz/uploaded/files/45938944099.pdfIn PDF document text
    • http://trieuduong.com/images/Download/41598610903.pdfIn PDF document text
    • http://michellenevinracing.com/FCKeditor/file/21522142522.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=react+native+scrollview+android+not+workingPDF 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_off0000ab31.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAB31 18180 bytes
SHA-256: 212a8fbe477e168b879e5d489ec8cd7afcce1dc07b06bdfa8eb4c939d2bfc9c4
font_01_sfnt_off0000da67.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA67 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f27e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF27E 10836 bytes
SHA-256: e96f79e6e574c2ead56068705cc02d3849c3cb0bc502404eb8b419d676545e5d

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