Malicious PDF — malware analysis report

Static analysis result for SHA-256 1d72d8425662e468…

MALICIOUS

PDF

76.5 KB Created: 2021-09-23 19:34:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: ff4dad901cba98d601d427e35286a539 SHA-1: b551d6195925cf4001b436b41190bb394e826878 SHA-256: 1d72d8425662e468095d27071ffae6b65769761b9310d10f634da686c59edcd9
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF was flagged by ML classifiers and ClamAV as malicious, with heuristics indicating it functions as a link farm. The presence of numerous embedded URLs, many pointing to disposable domains, suggests an attempt to manipulate search engine results or redirect users to malicious content. While no scripts were explicitly extracted, the nature of PDF exploits often involves embedded JavaScript to facilitate redirection or further payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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 http://mkbeauty.vn/luutru/files/papojuvafurujewoma.pdf
    • http://studioguatta.it/userfiles/files/84393625332.pdf
    • http://www.nationaalgolfcongres.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1612f5c07b01a6---datanaxela.pdf
    • https://elpollopaulino.com/cenavarra_userfiles/files/73887531368.pdf
    • http://studiomarcheluzzo.it/userfiles/files/88449218794.pdf
    • http://penzionriverside.cz/files/file/15515329834.pdf
    • https://terminarz.online/kosmetyczka/krakow/files/bifelulowovu.pdf
    • https://lemarko.com/userfiles/file/67931747103.pdf
    • http://unicaconsultoriarh.com/images/files/xokupavolesulufuzadunus.pdf
    • http://doubles301.jp/files/ckeditor/files/68387960445.pdf
    • http://msslink.ru/userfiles/files/runolun.pdf
    • http://thomas-zigon.de/images/file/wiveloxi.pdf
    • http://codienlanhminhquang.com/upload/files/36872354794.pdf
    • http://comlark.ru/userfiles/files/23936541110.pdf
    • https://mattress-leader.com/media/71086808183.pdf
    • http://randygordonlawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/zakajenoli.pdf
    • https://ratoempat.com/contents/files/wekuxi.pdf
    • http://jjsgreatescape.com/uploaded_files/userfiles/files/13344055110.pdf
    • https://bisleriuber.genefied.co/ckfinder/userfiles/files/puvelubaxivudofijuz.pdf
    • https://srilangkapools.com/contents/files/jepagukonofamam.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=windows+2000+product+key
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c4c4.bin
4445fa6d36061e81891a5a02fba97e82341ca021a28a565b19a6522c71de5635		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC4C4 10924 bytes
font_01_sfnt_off0000de55.bin
1521c22efaa4569a3de152085487d8e7f819f4c1efff801cf1cbb91edd2d614f		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDE55 17836 bytes
font_02_sfnt_off00010ccd.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10CCD 16792 bytes

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