Malicious PDF — malware analysis report

Static analysis result for SHA-256 83d30cd7bf8425a8…

MALICIOUS

PDF

79.0 KB Created: 2021-09-20 06:48:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: efe8abb755007ac73b96a8ab06b25fdf SHA-1: 206971fa7ee2531098665ebf08136914ae3cc753 SHA-256: 83d30cd7bf8425a8e2063c004cf01f603ad0815da0533d0b1077b0361847f653
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The sample is a PDF document containing embedded JavaScript and a large number of external URIs, many of which are hosted on disposable domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The embedded JavaScript is likely responsible for initiating the download or redirection to these malicious URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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 https://www.shipgo17.com/plugin/ckeditor/ckfinder/userfiles/files/67861911315.pdf In PDF document text
    • http://perechen-izdaniy.ru/js/ckfinder/userfiles/files/99716422917.pdfIn PDF document text
    • https://shibbirs.com/media/files/javuzufazatekopewu.pdfIn PDF document text
    • https://kildevangen.dk/files/72575140539.pdfIn PDF document text
    • http://varvshistoriska.com/file/63164948445.pdfIn PDF document text
    • http://matras-devison.ru/upload/file/87999748879.pdfIn PDF document text
    • http://erfolgsapp.de/wp-content/plugins/formcraft/file-upload/server/content/files/1614720ef00272---bunumafuwibilowilasaki.pdfIn PDF document text
    • http://www.radioemka.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139d1bc913dc---11911227667.pdfIn PDF document text
    • https://ukmalayalamnews.com/userfiles/file/rudufupaxurowax.pdfIn PDF document text
    • http://agppi99.pretty-match.com/upload/files/99491308984.pdfIn PDF document text
    • https://reniuved.it/file/20167246987.pdfIn PDF document text
    • http://tryinvest.eu/userfiles/files/84718000921.pdfIn PDF document text
    • https://www.burnat-provins.ch/ck/ckfinder/userfiles/files/9075684692.pdfIn PDF document text
    • https://www.larche-de-jules.fr/ckfinder/userfiles/files/87129173452.pdfIn PDF document text
    • http://askort.pl/Upload/file/74759222034.pdfIn PDF document text
    • http://thechitay.com/uploads/userfiles/file/34092088167.pdfIn PDF document text
    • http://kooijobs.in/ckfinder/userfiles/files/19177260715.pdfIn PDF document text
    • https://pt2-turbo-j3t.com/contents/files/76680875673.pdfIn PDF document text
    • http://antonellascarpittadesigner.it/userfiles/files/87039430450.pdfIn PDF document text
    • http://vertex-decor.com/userfiles/file/81947006039.pdfIn PDF document text
    • http://www.dean-cpa.com/files/adminpic/file/79351919644.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=hobbs+and+shaw+full+movie+onlinePDF 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_off0000d1e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD1E9 10804 bytes
SHA-256: 6c9187966773fa4e8905ad4ae432f0961b636615deabbba488f46a32526fdb6f
font_01_sfnt_off0000ea98.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA98 17272 bytes
SHA-256: 5cbaf66660c870666c517b3f3b9eb43bc2e9db915ef879f512ccac4c1d492fb3
font_02_sfnt_off000116be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x116BE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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