Malicious PDF — malware analysis report

Static analysis result for SHA-256 b57c8ca3bf674dce…

MALICIOUS

PDF

79.2 KB Created: 2021-10-14 03:02:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 4dcfbf88a7e80280075dded16fcd1834 SHA-1: 3ff521501e783849aec6a2e0f92b462cd8e52eaf SHA-256: b57c8ca3bf674dceadc0c25d7c5e7d8fa3e035628f490fb2d05cff04d105b974
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, a common technique for executing malicious code within documents. The presence of numerous external links, many pointing to PDF files on potentially disposable domains, suggests a link farm or redirection mechanism. ClamAV and ML classifiers strongly indicate malicious intent, likely phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://barsugo.com/ckfinder/userfiles/files/sakezikuwazuwenirutivinuf.pdf In PDF document text
    • https://iva-vietnam.com/userfiles/file/vowozifonubepabokirosumab.pdfIn PDF document text
    • https://www.sacict.or.th/ckfinder/userfiles/files/betikonipa.pdfIn PDF document text
    • http://klimagra.pl/images/wysiwyg_img/file/92332470237.pdfIn PDF document text
    • https://vietnamairlinescorp.org/js/ckfinder/userfiles/files/kuxoz.pdfIn PDF document text
    • http://www.optimizecost.com/admin/ficheros_fckedit_subidos/kesiwebixo.pdfIn PDF document text
    • http://biosystech.com/pdsFck/file/82109146341.pdfIn PDF document text
    • https://fatheragneliti.com/wp-content/plugins/formcraft/file-upload/server/content/files/1615d0737a09cf---fixunilo.pdfIn PDF document text
    • https://minhgianggroup.vn/upload/files/donawalege.pdfIn PDF document text
    • http://cuboni.com/uploadfile/hong202110081758522720.pdfIn PDF document text
    • http://eminenceinc.com/userfiles/file/63007731190.pdfIn PDF document text
    • http://fine-cottage.ru/userfiles/files/82327299947.pdfIn PDF document text
    • http://klemanpince.hu/files/file/xilagij.pdfIn PDF document text
    • http://averon.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1613f9c016348b---vovajufepogufo.pdfIn PDF document text
    • http://www.icf-plant.com/files/file/tazipabatawogajupofoj.pdfIn PDF document text
    • https://jajugroup.com/ckfinder/userfiles/files/49520129861.pdfIn PDF document text
    • http://lmtechsolution.com/userfiles/38869425875.pdfIn PDF document text
    • https://0924055971.com/uploads/files/202110040223333062.pdfIn PDF document text
    • http://onelove.cz/file/nemufurum.pdfIn PDF document text
    • https://drddvichitra.com/userfiles/file/dadukaxenox.pdfIn PDF document text
    • http://feedproxy.google.com/~r/MbOu/~3/HTGXzuRVGb4/uplcv?utm_term=can+bad+engine+mounts+cause+rough+idlePDF 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_off0000d08d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD08D 11088 bytes
SHA-256: a75f779a95e188f90d51a4fec1893d6fd2889db8cc26b4806e3547aaddd870ae
font_01_sfnt_off0000ea08.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA08 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001021a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1021A 17412 bytes
SHA-256: de826895c7c013068d74da3ff2d833ed91d3dae327ebc43b2871ab57ab8d2609

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