Malicious PDF — malware analysis report

Static analysis result for SHA-256 31dc41c761e61baf…

MALICIOUS

PDF

72.7 KB Created: 2021-09-19 17:11:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: eb74cfed4adc93893dd644002faa9c3c SHA-1: c9e5b44d1a853f83a48331d3fad801786b07286f SHA-256: 31dc41c761e61baf77c078e5ddaf9a23847e778c1e562d95f4e166473aaad656
134 Risk Score

Malware Insights

MITRE ATT&CK
T1059.007 JavaScript T1566.001 Spearphishing Attachment

The sample was identified as malicious by ClamAV and an ML classifier, with heuristics indicating embedded JavaScript and external URIs. The embedded JavaScript likely serves to execute malicious code or redirect the user to phishing or malware download sites. The presence of numerous external links, many on disposable domains, suggests a link farm or phishing campaign aimed at tricking users into downloading files or visiting malicious sites.

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 https://inwebjor.ru/uplcv?utm_term=lg+package+disabler PDF link annotation
    • http://botosani.ro/img/uploads/file/dolobesotugotuture.pdfIn PDF document text
    • http://www.binghan.my/userfiles/file/82285402633.pdfIn PDF document text
    • https://www.alitec.es/js/ckfinder/userfiles/files/fawapinijazomurogaluril.pdfIn PDF document text
    • http://www.centrosanmarco.eu/img/news/files/femunifowufu.pdfIn PDF document text
    • http://softwarefactory.nl/images/file/nizusuwifu.pdfIn PDF document text
    • http://www.ocptecnology.com/admin/uploaded/fck/file/mifef.pdfIn PDF document text
    • https://udruga-invalida.hr/files/35485771994.pdfIn PDF document text
    • https://certifiedcollisionrepair.com/home/cert/public_html/ckfinder/userfiles/files/webova.pdfIn PDF document text
    • http://bjjiffy.com/upload/gomidebodasuvaku.pdfIn PDF document text
    • https://namratalakhotia.com/userfiles/files/lujoruvokogigetox.pdfIn PDF document text
    • http://velomagazin.hu/UserFiles/file/ratofizenunelu.pdfIn PDF document text
    • http://eubeer.vn/uploads/files/88322443812.pdfIn PDF document text
    • https://manajrgvaaradhi.com/cms-uploads/files/65821180751.pdfIn PDF document text
    • http://rainhouse.kr/data/editor/file/4933226133cc4f29348.pdfIn PDF document text
    • http://zgic.ru/!upload/files/lagisonafuziwupotog.pdfIn PDF document text
    • http://plkorea77.com/ckupload/files/pozozuwimevenedofu.pdfIn PDF document text
    • http://crystalnymph.by/wp-content/plugins/super-forms/uploads/php/files/1025ee602c21008225094666ea90b31e/81800376665.pdfIn PDF document text
    • https://auditorescr.com/ckfinder/userfiles/files/56215504596.pdfIn PDF document text
    • https://www.audifonosdoshoydos.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613eb4a4f2242---68220302688.pdfIn PDF document text
    • 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_off0000b7d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB7D8 10556 bytes
SHA-256: 1a11e4ddb7b272eb9f0f3392cdd56a0188c02b8d1d8f2f0b3082934d9a25aeaf
font_01_sfnt_off0000cf94.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF94 17828 bytes
SHA-256: 9b9dc46b07b048b0884005d650feb5441b470b8a5f5fd9e081d7986f05294c03
font_02_sfnt_off0000fe28.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE28 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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