Malicious PDF — malware analysis report

Static analysis result for SHA-256 ac362df02471fb24…

MALICIOUS

PDF

84.2 KB Created: 2021-09-11 03:32:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: aefc243ac1468aa07fed27ea0fdef940 SHA-1: 23403b5d4914368ab981b00284f77dc919019829 SHA-256: ac362df02471fb24898c5dc4780645dc42d4f5ac086ac4d0f3c7d3d276286723
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, a common technique for exploiting PDF vulnerabilities or redirecting users. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates the document's purpose is to host numerous links on disposable domains, likely for phishing or distributing further malware. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

Heuristics 6

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://jlm-kg.com/uploads/file/vatifeminagaxodo.pdf
    • https://abhimaninteriors.com/ckfinder/userfiles/files/87586872790.pdf
    • http://www.etoiles-recrutement.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135fcbfeb6ec---33865764292.pdf
    • http://woodwaysindia.com/uploads/87914390492.pdf
    • http://due.pt/js/ckfinder/userfiles/files/77553960911.pdf
    • http://formpart.com/upload/ckfinder/files/90943506682.pdf
    • https://simplehome.ro/ckfinder/userfiles/files/divafulinewuwej.pdf
    • http://speckletrack.com/update/editor/file/ruwigobaleminoripetukiboj.pdf
    • http://pnmanagementsolutions.in/uploads/bofelolomuwusifusoso.pdf
    • https://www.agro-zavod.ru/app/webroot/js/ckfinder/userfiles/files/23526278789.pdf
    • http://idrogastermoclima.it/Utentifile/FCKPage/file/dijiwivaxefi.pdf
    • http://bentleyplemtech.ru/userfiles/file/95676584188.pdf
    • https://skvacations.com/userfiles/file/voliguwifage.pdf
    • https://magerp.org/upload/files/30241594199.pdf
    • http://xn--9w3b270a7kf.kr/data/editor/file/temuvipawakav.pdf
    • http://needychild.org/ckfinder/userfiles/files/tumowarixazexosubemet.pdf
    • https://bikeid.net/ckfinder/userfiles/files/vujikuremi.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=yodot+android+data+recovery+review
    • 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_off0000e605.bin
150485de583596bd09b0d8d5f9bff1bba126fd291110110ad6684aa4af4c6d1d		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE605 17768 bytes
font_01_sfnt_off000114b1.bin
c19e9b506c5576999bf25389ff8da4ea9b860dbc911e38097b2b43ac01eb157b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x114B1 10396 bytes
font_02_sfnt_off00012c5f.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12C5F 16792 bytes

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