Malicious PDF — malware analysis report

Static analysis result for SHA-256 b9d71829a1b301c9…

MALICIOUS

PDF

85.2 KB Created: 2021-09-21 07:58:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 489c5ad8ca5a5498793df0c59bd58eee SHA-1: 29b692037b338561134a7a60b7ac8fd5978d84de SHA-256: b9d71829a1b301c9dfe037805622692611486f5af439d1340b7f0c86b2983afe
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, indicating an attempt to execute code upon opening. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' and the numerous extracted URLs suggest a phishing or malware distribution campaign. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to directing users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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 https://cli-kh.com/uploads/files/202109141153321765.pdf In PDF document text
    • http://duetsepolno.pl/userfiles/file/gebosaruzuxikuwumuxusope.pdfIn PDF document text
    • http://carnavaldemarbella.com/Senegal_5/Content/files/userfiles/file/83719827569.pdfIn PDF document text
    • https://livnica-metalurg.com/images/pages/file/93990759928.pdfIn PDF document text
    • http://inarchengineering.it/userfiles/files/47146354300.pdfIn PDF document text
    • https://www.audifonosdoshoydos.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138a5e8c220b---ruzitume.pdfIn PDF document text
    • http://vinhosnorte.com/images/files/54972476100.pdfIn PDF document text
    • https://cauthinh.com/luutru/files/videkak.pdfIn PDF document text
    • http://aimecostruzioni.it/userfiles/files/rokazijusom.pdfIn PDF document text
    • http://chothuethietbi.info/img/files/xatemizixutes.pdfIn PDF document text
    • http://dentherapia.hu/files/file/27148200616.pdfIn PDF document text
    • http://savaksangida.com/resimler/files/7055950894.pdfIn PDF document text
    • http://recrute.fr/files/files/26375004364.pdfIn PDF document text
    • https://repairbase.net/FCKeditor/editor/filemanager/connectors/php/images/file/bugewu.pdfIn PDF document text
    • http://radecznica.pl/userfiles/file/41361755805.pdfIn PDF document text
    • http://fusen-es.info/yamituki-n/uploads/files/walevisabidusamewuf.pdfIn PDF document text
    • https://pellevah.com/upload/files/nikopibuzivetirobu.pdfIn PDF document text
    • https://grandhotelbulgaria.com/userfiles/file/xofuketogusetodesuwure.pdfIn PDF document text
    • http://hockjoohin.com/admin/uploads/file/dozakidawutotodasiberil.pdfIn PDF document text
    • https://maggies-handmade.com/UserFiles/files/98436800872.pdfIn PDF document text
    • https://amoslodge10.org/ckfinder/userfiles/files/janoluwizapesami.pdfIn PDF document text
    • https://www.barefoothoa.com/webroot/js/ckfinder/userfiles/files/loxulevadamesewefiz.pdfIn PDF document text
    • http://apluskleaning.com/admin/images/file/ritumejukububumuvejanu.pdfIn PDF document text
    • http://kompassztuki.pl/Image/files/53953460872.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=elgato+android+phonePDF 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_off0000e903.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE903 17620 bytes
SHA-256: 4810394772076fa5bf1c743703c5304e0e4ef5058bf7c3f525f93c4cbd886104
font_01_sfnt_off0001171a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1171A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012f31.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12F31 10484 bytes
SHA-256: abf751b8c5a08b9adbbb1bc5e4a6736e25ad58c2ecaf1d891de6a2c273fd0ef6

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