Malicious PDF — malware analysis report

Static analysis result for SHA-256 e49a60775ae42f17…

MALICIOUS

PDF

99.3 KB Created: 2021-09-22 13:22:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 40747bdb4ca780f66c285a93dc49330b SHA-1: 9a3d1c655c73aa422686e42697ed7ae5974e3f12 SHA-256: e49a60775ae42f17c976986755d26ea8e34d7027029a0df5e4be0a90d24ae843
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The PDF contains numerous embedded URLs, with one heuristic specifically flagging it as a link farm on disposable hosting. While no scripts were explicitly extracted, the PDF structure and the presence of external URIs suggest it's designed to redirect users to potentially harmful websites, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9984

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://reafamily.lt/ckfinder/userfiles/files/24194324557.pdf
    • https://www.a2zmedical.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1613d1bdad4392---benat.pdf
    • https://skiclubraonbaccarat.fr/pdf/resifurukoduno.pdf
    • http://patrick-jardinage.fr/ckfinder/userfiles/files/86266958577.pdf
    • http://3gr-group.com/ci/userfiles/files/83309351098.pdf
    • http://psystems.gr/Administrator/uploads/userpics/OutPostImages/files/60940939839.pdf
    • https://yasacompany.com/upload/files/rasujuj.pdf
    • https://gedayapi.com/userfiles/file/36470677986.pdf
    • http://www.atsamuihaus.com/image/upload/File/pitutafonujalogo.pdf
    • http://cocoabuterol.com/upload/files/degujodudazivu.pdf
    • https://maharajganjtimes.com/assets/ckfinder/core/connector/php/uploads/files/59179689008.pdf
    • http://clubsahdianagalati.ro/upload/editor/file/49573771192.pdf
    • https://mitrasuksesku.com/userfiles/file/43935940373.pdf
    • http://cabanagarden.hu/editor_up/tanoboxebogogezopawa.pdf
    • http://etkenkalip.com/files/demetaludilalatavalogig.pdf
    • http://hyundaidongdo3s.com/images/files/27257891368.pdf
    • https://tourpon.kr/FileData/ckfinder/files/20210917_E9AD48AE59D6256A.pdf
    • https://avukatwebsitesi.kocgrafik.net/upload/files/69784904024.pdf
    • http://oilmachineydy.com/d/files/94664719310.pdf
    • http://www.sospapa24.com/lib/ckfinder/imgupload/files/wopawupekaboj.pdf
    • http://leadingedgecorporate.com/user_images/file/36532198181.pdf
    • http://www.cenlafilm.com/siteuploads/editorimg/file/13290413728.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=gi+joe+123movies
    • 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_off00011aab.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11AAB 16792 bytes
font_01_sfnt_off000132c2.bin
3c603bd408af2351b600db752cc1d4b7957c13648bf96d3d87d83b28abe0c5ef		 pdf-font-stream PDF embedded font (sfnt) at offset 0x132C2 10336 bytes
font_02_sfnt_off00014a2e.bin
8afa3183ae7cce1d9525610490895562d6efecfb06848ba479f34df3a94321ba		 pdf-font-stream PDF embedded font (sfnt) at offset 0x14A2E 20192 bytes

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