Malicious PDF — malware analysis report

Static analysis result for SHA-256 cbd418ddb45ece95…

MALICIOUS

PDF

69.9 KB Created: 2021-09-23 18:08:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-21
MD5: 3b89a1821bb88b5f7f393632614577c2 SHA-1: b8813ff211f8b98599bdb48f7ea6cebf6522af65 SHA-256: cbd418ddb45ece958d7cb2fa98e0830c6b7098f108f31da6939e646c53f95e60
134 Risk Score

Malware Insights

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

The PDF contains embedded JavaScript, a common technique for executing malicious code within documents. The ML classifier and ClamAV detection strongly indicate malicious intent. The embedded JavaScript likely redirects to external URLs, as suggested by the PDF_URI and EMBEDDED_URL heuristics, which are often used for phishing or to download further malicious payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://bhiringisamsankalimandir.org/userfiles/file/73177806148.pdf In PDF document text
    • http://zs-g.jp/app/webroot/js/ckfinder/userfiles/files/45674733894.pdfIn PDF document text
    • http://geofer.eu/userfiles/files/41708692994.pdfIn PDF document text
    • http://landroverbh.com/ckfinder/userfiles/files/85601861270.pdfIn PDF document text
    • http://thaisomboonautopart.com/userfiles/files/91376451659.pdfIn PDF document text
    • http://cameralehiep.com/hinhanh_fckeditor/file/fidovuvugedujowi.pdfIn PDF document text
    • http://aedjtjdshbf.pretty-match.com/upload/files/kawenimewonorefukus.pdfIn PDF document text
    • https://listapp.in/ci/userfiles/files/pulati.pdfIn PDF document text
    • http://myoffice2561.sesao33.net/UserFiles/File/35878346540.pdfIn PDF document text
    • https://apatity.verlauf-ekb.ru/admin/ckfinder/userfiles/files/68699328167.pdfIn PDF document text
    • https://afmiletisim.afmiletisimajansi.info/resimler/files/84512096268.pdfIn PDF document text
    • https://fertilizergranulatorprice.com/d/files/tojukexotowi.pdfIn PDF document text
    • https://adiwirawanbali.com/wp-content/plugins/super-forms/uploads/php/files/322e14d22903e2431df06c3fbd6300bc/ganogodof.pdfIn PDF document text
    • https://bearings.vn/images/ckeditor/files/pekuloraz.pdfIn PDF document text
    • http://firsttimehomebuyerstudy.com/images/file/ketasu.pdfIn PDF document text
    • https://doucetplasticsurgery.com/ckfinder/userfiles/files/38408922993.pdfIn PDF document text
    • https://leosservices.com/userfiles/file/futorifanapu.pdfIn PDF document text
    • http://wolfroccatiassociati.it/userfiles/files/jefezanatelokixukibes.pdfIn PDF document text
    • http://nobody-films.com/bpms/includes/fckeditor_uploads/userfiles/file/juradufofabove.pdfIn PDF document text
    • https://supportsystemsvainc.com/home/ssvi/public_html/ckfinder/userfiles/files/87029710689.pdfIn PDF document text
    • http://grandviewgroupresort.com/upload/files/17112671173.pdfIn PDF document text
    • http://fmi.lu/userfiles/files/limekolenapuv.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=wavelength+of+waves+in+the+electromagnetic+spectrumPDF 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_off0000b0a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB0A4 15380 bytes
SHA-256: 1a5312c0c8869de46567720b8531dc1aa5609ee36860d780c95aa938fc36dd19
font_01_sfnt_off0000d7db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7DB 11172 bytes
SHA-256: 0a87ebfe930390ee4de6376b023266661c9a7c285fc26c754a008767ee4008a1
font_02_sfnt_off0000f1d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1D6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1