Malicious PDF — malware analysis report

Static analysis result for SHA-256 f428843a404d0e16…

MALICIOUS

PDF

69.7 KB Created: 2021-09-29 05:32:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 4f51e81e518f331d627c551df9101b71 SHA-1: 23b23edb03d89fac9cead95ff2b3880055403d7c SHA-256: f428843a404d0e16716f12f2c82d7aa4a0234ce9bf64dae7f78be91ee6ae3938
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs that point to disposable hosting and are structured as a link farm, a common tactic for phishing or distributing further malware. The ML classifier and ClamAV detection strongly indicate malicious intent. Although no scripts were explicitly extracted, the PDF structure and embedded URIs suggest it's designed to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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://synerhu.ru/uplcv?utm_term=rick+riordan+pdf
    • http://telegid.tv/userfiles/file/pozafarixigifawa.pdf
    • https://10fci.net/userfiles/file/2904969202.pdf
    • https://siyata.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/16148c60a9b8ee---61481508938.pdf
    • https://coherence.cz/userfiles/file/lowowefovodifolikat.pdf
    • http://immobilier-valence-agen.com/userfiles/file/tevegusumivofodola.pdf
    • http://rlangkhan.com/upload/userfiles/files/kotijegobeniminik.pdf
    • http://michellenevinracing.com/FCKeditor/file/tujigelew.pdf
    • https://paardenwelzijnscheck.nl/app/webroot/files/ckeditor_files/files/26857805923.pdf
    • http://freestyler.cz/img/file/79472503736.pdf
    • http://paulabenveniste.com/UserFiles/file/38995790965.pdf
    • http://1day2night.com/UserFiles/file/87112448547.pdf
    • http://24horasnoar.com.br/ckfinder/userfiles/files/74839750375.pdf
    • http://daglichtfilters.nl/ckfinder/userfiles/files/46935272377.pdf
    • https://eco-translation.ca/upload/editor/file/moweg.pdf
    • https://doanandieuduong295doson.vn/namthuan/images/news/files/tematodutunepupetemunexe.pdf
    • https://cottingham-group.com/cufiles/files/27482914501.pdf
    • http://redactron.com/userfiles/file/mizudezefinab.pdf
    • https://sofanet.ro/ckfinder/userfiles/files/paxuj.pdf
    • http://sksound.com/userfiles/file/niwopatesujozidafusowogef.pdf
    • http://www.sctiec.com/up_files/FCK/file/vevewim.pdf
    • http://4darchitecture.org/img/all/43053687651.pdf
    • https://nasikampung.info/contents/files/wodoxukuwakipi.pdf
    • http://oawebserver.com/piceditor/file/43191211093.pdf
    • 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_off0000b0d7.bin
3be4cca29246c8160f5aa0794e2719a297b59ddf4a0231011365b5303d200dd5		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB0D7 16152 bytes
font_01_sfnt_off0000d9d3.bin
b64261df6457339882768d0ad905c9f9d6827231a749acd00c8d9590e6da19da		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD9D3 10304 bytes
font_02_sfnt_off0000f120.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF120 16792 bytes

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