Malicious PDF — malware analysis report

Static analysis result for SHA-256 fc248e1290d19303…

MALICIOUS

PDF

92.6 KB Created: 2021-09-10 21:30:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 5684155103c85edd52c58b6b14b95496 SHA-1: e40102a6dc56bbbc44fa36b9f0d31b2a61641e76 SHA-256: fc248e1290d19303b9ec5ecf1176f2156d64f82dd82222bb32d889eec6b32b2b
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains numerous embedded URLs, many of which point to potentially malicious PDF files hosted on various domains, suggesting a link farm or redirection mechanism. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' further supports this, indicating the PDF is designed to host many links on disposable domains. While no scripts were explicitly extracted, the presence of external URIs and the overall structure suggest an attempt to redirect the user to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://daming-school.com/userfiles/file/nukumodeta.pdf In PDF document text
    • http://barexkft.hu/userfiles/file/59128455911.pdfIn PDF document text
    • http://schokofontaene.de/idata/wusovezuxokokipivipufu.pdfIn PDF document text
    • http://ipost.mn/ckfinder/userfiles/files/zobabevekedor.pdfIn PDF document text
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135b55e55f0d---14511359534.pdfIn PDF document text
    • https://xyoaa.org/sites/default/files/files/dasezenewakixekijize.pdfIn PDF document text
    • http://sanitaerprofi.ch/fckeditor/editor/images/file/61226499969.pdfIn PDF document text
    • https://semineebrasov.ro/printuri-fi/files/75402818734.pdfIn PDF document text
    • http://ambcavallon.eu/userfiles/files/43912310003.pdfIn PDF document text
    • https://www.kiemtoandongnghi.com/public/plugins/ckfinder/userfiles/files/janonotituratolebeloseki.pdfIn PDF document text
    • https://vokalensemble-vocembalo.ch/userfiles/file/wixepi.pdfIn PDF document text
    • http://kitpaisal.com/mypicture/file/wenetikobimebigono.pdfIn PDF document text
    • http://www.agot.pl/upload/file/jowuxivesukakusuvurelapof.pdfIn PDF document text
    • https://www.baust.edu.bd/app/webroot/ckfinder/userfiles/files/51140881336.pdfIn PDF document text
    • http://whuntex.info/userfiles/file/69183252275.pdfIn PDF document text
    • http://vendsol.com/userfiles/file/38191224887.pdfIn PDF document text
    • https://mbbs.hr/files/50690775799.pdfIn PDF document text
    • https://namdolove.com/FileData/ckfinder/files/20210909_D89C15CF39A8595B.pdfIn PDF document text
    • https://travellifeafrica.com/ci/userfiles/files/sutux.pdfIn PDF document text
    • http://maivietnamesecotati.com/uploads/files/7296119267.pdfIn PDF document text
    • http://nofatrans-int.com/userfiles/file/weraresugagesun.pdfIn PDF document text
    • http://www.lentilles-progressives.fr/wp-content/plugins/formcraft/file-upload/server/content/files/161341851787a2---jolosupojupag.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=what+is+ethical+fashionPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000105ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105EE 10328 bytes
SHA-256: a7a57a17465fda43f7cf0929f436a4748b2f64fb02c217d494d3194945d760d5
font_01_sfnt_off00011d26.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D26 18564 bytes
SHA-256: 41889fe70f9a2384b78ca5e8118182cb0bce9d260c8025a81995512d3650aff5
font_02_sfnt_off00014ce8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14CE8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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