Malicious PDF — malware analysis report

Static analysis result for SHA-256 b39efa9e8a183f33…

MALICIOUS

PDF

84.4 KB Created: 2021-09-23 09:37:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 333929f0b0074ef0281e0fc402b3c890 SHA-1: fc0cb916493bd6f473fdcc964f8f08fb6452f24e SHA-256: b39efa9e8a183f33f361f8521a177610d13b84dd3de45c324966b8cd6dbfa4c1
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, with a high ML confidence score and ClamAV detection indicating malicious intent. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' suggests the document is designed to host many links on disposable domains, likely to obscure the true malicious destination. The embedded JavaScript is a common technique for executing malicious code or redirecting users to phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://videotour24.com/data/fckupload/file/74479195184.pdf In PDF document text
    • https://newfrio.com/userfiles/files/69550703211.pdfIn PDF document text
    • http://familiegravesen.dk/userfiles/file/sibipulejedetuguk.pdfIn PDF document text
    • https://kontiko.com/ktkweb3/images/upload/files/kuxebidorelunetunava.pdfIn PDF document text
    • https://intekcanada.com/ckfinder/userfiles/files/lujibivoxewagaduwowex.pdfIn PDF document text
    • http://ptaki.info/imgekoprojekty/files/32557103011.pdfIn PDF document text
    • http://aimecostruzioni.it/userfiles/files/64790333267.pdfIn PDF document text
    • http://kennycojewelry.com/userfiles/files/202109/1631971650.pdfIn PDF document text
    • http://bbhshipyard.com/userfiles/file/87255263757.pdfIn PDF document text
    • https://www.quatainvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/161401da6dbdf1---tavarunurisazesuzesazib.pdfIn PDF document text
    • https://demircanticaret.com/userfiles/file/40208267289.pdfIn PDF document text
    • https://zilalcooling.com/other_files/File/jugawofapodoxefoka.pdfIn PDF document text
    • http://veiligheidssloten.nl/ckfinder/userfiles/files/15099989073.pdfIn PDF document text
    • http://notariocprietoa.com/notaria/documentos/files/lujebidakijuvuvibum.pdfIn PDF document text
    • http://bigbulkbags.ahmadpackages.com/survey/userfiles/files/14363965751.pdfIn PDF document text
    • http://etenindex.nl/images/uploads/jujus.pdfIn PDF document text
    • http://osoboebludo.com/ckfinder/userfiles/files/682854537.pdfIn PDF document text
    • http://48bulls.com/js/upload/files/20120429733.pdfIn PDF document text
    • https://holocaustresearch.pl/nowy/photo/file/85074301807.pdfIn PDF document text
    • http://xedaptap.net/userfiles/file/40162207803.pdfIn PDF document text
    • https://airflow-skateboards.com/upload/file/19639310426.pdfIn PDF document text
    • http://mclarenquartz.in/ci/userfiles/files/57788385966.pdfIn PDF document text
    • http://watch62.ru/files/files/35784719289.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=adb+to+fastbootPDF 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_off0000e4a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4A2 18972 bytes
SHA-256: 2b7e8e200c2e4ea548179347fec763b61fd03a14d8e29a46558ad020f5102133
font_01_sfnt_off000115ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x115EE 9996 bytes
SHA-256: 91a200cb35c59da975487d36ca36c8385f44aac181077abe30b549193b206d41
font_02_sfnt_off00012c43.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C43 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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