Malicious PDF — malware analysis report

Static analysis result for SHA-256 4583f0f844270a9e…

MALICIOUS

PDF

77.9 KB Created: 2021-10-07 04:26:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 010e82d6995aa2be9bd54a8de9084cb0 SHA-1: edc2db9631a367643f8b08f8bd75fbba41ca5eeb SHA-256: 4583f0f844270a9e428da84932b0535d989700711bed218fa2be1f18ce12ed5f
134 Risk Score

Malware Insights

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

The file is a PDF containing embedded JavaScript, which is a common technique for delivering malicious content. The PDF also contains numerous links to external websites, many of which are hosted on disposable domains, suggesting a phishing or link-farming operation. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to redirect users to phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9908

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://nsstore.mx/ckeditor/ckfinder/archivossubidos/files/vurudulematagimejux.pdf In PDF document text
    • http://cathugo-catamarans.de/res/wysiwyg/file/78088403224.pdfIn PDF document text
    • http://kunmobile.vn/files/uploaded/20210915/file/rorev.pdfIn PDF document text
    • http://studiodabo.eu/userfiles/files/92657064118.pdfIn PDF document text
    • http://aggengr.com/uploads/CMS/file/dexuko.pdfIn PDF document text
    • https://rimsball.com/ckfinder/userfiles/files/zawima.pdfIn PDF document text
    • https://branches.armz.ru/media/File/4457757116.pdfIn PDF document text
    • http://imprezka.2kc.pl/Upload/file/fisurokazomomeronur.pdfIn PDF document text
    • http://lavera.it/wp-content/plugins/formcraft/file-upload/server/content/files/161531d80f07aa---91016356071.pdfIn PDF document text
    • https://reha.bg/content/upload/file/fusovigatikonuwitezibeku.pdfIn PDF document text
    • http://veszpremkosar.hu/_user/file/80196131651.pdfIn PDF document text
    • http://slkuang.com/v15/Upload/file/2021929162676567.pdfIn PDF document text
    • https://newchat.xyz/js/ckfinder/userfiles/files/31156352667.pdfIn PDF document text
    • https://indolabtek.com/Uploads/userfiles/files/sotumavefomizef.pdfIn PDF document text
    • https://datajournonepal.org/files/jirifepiwik.pdfIn PDF document text
    • https://karatenarrewarren.com.au/ckfinder/userfiles/files/sukeresosa.pdfIn PDF document text
    • http://ristoranteibucanieri.it/userfiles/files/35597705175.pdfIn PDF document text
    • https://samngaimarble.com/html_upload/file/degogakexatil.pdfIn PDF document text
    • http://stylowa-pss.pl/userfiles/file/86956070342.pdfIn PDF document text
    • https://cplastik.eu/data/cms/file/taxizatimuwonimew.pdfIn PDF document text
    • http://ersatzmonitor.de/userfiles/file/95731362994.pdfIn PDF document text
    • https://demowz.reikor.com/webimages/files/57444773042.pdfIn PDF document text
    • https://newtech-utm.pl/userfiles/file/38605037440.pdfIn PDF document text
    • http://futiandj.ntgis.com/UploadFile/2021/10/01/file/20211001_110413_106.pdfIn PDF document text
    • http://www.yourhealthyourchoice.org/wp-content/plugins/formcraft/file-upload/server/content/files/1615a5e16bb516---buwurosajogabusodomu.pdfIn PDF document text
    • https://pmcp-avac.com/files/upload-ckfinder/files/nugelaboxapitetoxa.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=antenuptial+contract+examplePDF 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_off0000ca3a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA3A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e251.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE251 10552 bytes
SHA-256: af97a51142c756b273da3726abed2b0bbb00aca1183d49e65b23241c4bf42444
font_02_sfnt_off0000fa60.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA60 18296 bytes
SHA-256: 7c15fcad9f6c976bac775e4f323cc862a735f1b52ccb4ec7b93f683bf87914c1