Malicious PDF — malware analysis report

Static analysis result for SHA-256 2b00a2b51552fb98…

MALICIOUS

PDF

97.1 KB Created: 2021-09-17 19:11:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 025d8817bd80c6d2e7df1ae164d9797a SHA-1: 33bdbc43261942893e119961260186e1b6ab2bc5 SHA-256: 2b00a2b51552fb9874426c69b7469910ca92328ee59066b8ade8aef342165f41
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a high likelihood of malicious intent. The PDF contains a large number of embedded links, many pointing to potentially compromised or disposable domains, suggesting a link farm or phishing lure. While no scripts were explicitly extracted, the PDF structure and numerous external URIs suggest it's designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9888

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://evergladesharvesting.com/ckfinder/userfiles/files/papez.pdf
    • http://obchodsezlatem.cz/upload/files/87271954776.pdf
    • http://veszpremlizards.hu/_user/file/32522489110.pdf
    • https://www.beadvised.co.uk/wp-content/plugins/super-forms/uploads/php/files/5d64584e9d49443736c243b51f813284/30186109314.pdf
    • http://covina.crazyrockinsushi.com/uploads/files/81784937119.pdf
    • http://khiensa.com/UserFiles/File/58633195.pdf
    • http://tcihk.com/userfiles/82664070583.pdf
    • https://gberwanda.com/gbe/useruploads/blogs/files/91172986739.pdf
    • https://idealist.ro/userfiles/file/giledaterirovirekope.pdf
    • http://mensagemcrista.com.br/ckfinder/userfiles/files/23545882597.pdf
    • http://sevennews.com.br/ckfinder/userfiles/files/kosiwuxo.pdf
    • https://pabausa.org/wp-content/plugins/formcraft/file-upload/server/content/files/161410e9d8d33b---tonitagifofiwisil.pdf
    • http://vngo-cc.vn/cooker/public/files/weros.pdf
    • https://tasivn.com/upload/ck/files/93633575151.pdf
    • http://hastensandbreakfast.nl/userfiles/file/79269974943.pdf
    • https://gym-rectif.fr/ckfinder/userfiles/files/17077708275.pdf
    • http://www.pilatesyoga.hr/files/files/melofemorepibubav.pdf
    • https://theloneranger.tv/clients/loneranger/ckfinder/userfiles/files/84385653892.pdf
    • http://el-master.ru/userfiles/file/lubosupobewijibux.pdf
    • http://mobiliteit.nu/files/64451632390.pdf
    • https://krzczonowice.pl/gfx/file/76593498027.pdf
    • http://casadiriposomarsala.it/userfiles/files/50171049338.pdf
    • https://braindevelopmentmaps-org.neurondevelopment.org/userfiles/files/bovuzaxamak.pdf
    • http://herve-coiffure.ci/files/texevopotel.pdf
    • http://se-ty.ru/uploads/userfiles/file/laxexu.pdf
    • http://thucphamchucnangmy.vn/uploads/files/luzatap.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=moemon+heart+gold
    • 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_off00011201.bin
994a788fb596439daabe68c1020e5afef74657672de8a4266fe8d99eb7f767cc		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11201 10428 bytes
font_01_sfnt_off00012936.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12936 16792 bytes
font_02_sfnt_off00014148.bin
3c0db6bd29a915070fa4ef920e340a8ddcadb637af256a2cc731bbdd001e98e6		 pdf-font-stream PDF embedded font (sfnt) at offset 0x14148 20164 bytes

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