Malicious PDF — malware analysis report

Static analysis result for SHA-256 ecdca7ef7e358baa…

MALICIOUS

PDF

79.0 KB Created: 2021-09-16 20:54:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: f5a04f281d602345aa0c650f65e71c7c SHA-1: 21d1ee2d4f487c8e631675ee52559c4b1861fc9a SHA-256: ecdca7ef7e358baabd8c5ca3d5d05a33900afcb99527a91c491a190cfe11775e
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, many of which point to potentially disposable domains, suggesting a link farm or phishing lure. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic specifically flags this behavior. While no scripts were explicitly extracted, the nature of the embedded URLs and the overall detection strongly suggest it's designed to redirect users to malicious sites, likely as part of a phishing campaign or to download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

Heuristics 5

  • 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.
  • 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://smwebtechnology.com/arishayurveda.com/userfiles/file/tulinuberepiwuda.pdf In PDF document text
    • http://kutscher-customs.de/gfx/userfiles/files/rowatesowumap.pdfIn PDF document text
    • https://pristineleather.com/userfiles/file/vajapiloko.pdfIn PDF document text
    • http://likuidart.com/files/ckeditor/files/25794335832.pdfIn PDF document text
    • http://photo-preiss.com/upload_files/files/wutejaronibeloviguz.pdfIn PDF document text
    • http://www.iuoelocal870.com/kaizen/ckfinder/userfiles/files/9222170559.pdfIn PDF document text
    • http://visualpaint.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f25339f11b---73323813.pdfIn PDF document text
    • http://vaness-sens.fr/ckfinder/userfiles/files/delisogu.pdfIn PDF document text
    • http://cana.vn/uploads/userfiles/file/pizinazunokaseg.pdfIn PDF document text
    • http://alompar.hu/uploads/content_files/files/wimufibe.pdfIn PDF document text
    • http://ersenergy.com/UserFiles/file/12748136029.pdfIn PDF document text
    • https://giant-nano.com/app/webroot/userfiles/files/sogabopuvikegijasipaga.pdfIn PDF document text
    • http://dga.gr/ILC/img/file/luborilumidefogekumemip.pdfIn PDF document text
    • http://lonerangerfanclub.com/ckfinder/userfiles/files/rexogopoxum.pdfIn PDF document text
    • http://botosani.ro/img/uploads/file/nemabododudu.pdfIn PDF document text
    • http://protectakoteasia.com/ckfinder/userfiles/files/lugafadojopabovewafigakur.pdfIn PDF document text
    • http://rhondadejean.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/99524844752.pdfIn PDF document text
    • https://shih-tzu.ro/files/file/17345906188.pdfIn PDF document text
    • http://flynewsletter.com/uploads/file/pifisafujabinelojiluj.pdfIn PDF document text
    • http://thoitrangvabaoho.com/Images_upload/files/navuminumadonumajatutif.pdfIn PDF document text
    • http://mardeestilos.es/fotos/file/59858869069.pdfIn PDF document text
    • http://graviroz.hu/ckfinder/userfiles/files/99747512415.pdfIn PDF document text
    • http://solentpodiatry.com/jackvl940/web/content/images_uploaded/file/32478480471.pdfIn PDF document text
    • http://avandcie-automation.fr/ckfinder/userfiles/files/zinakedabenekomufufi.pdfIn PDF document text
    • http://studiofelician.com/userfiles/files/14338271844.pdfIn PDF document text
    • https://stotex.rs/files/82000789821.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=how+to+add+disney+emoji+keyboard+to+androidPDF 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_off0000cf87.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF87 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e799.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE799 17336 bytes
SHA-256: f8a3b4d46312e3b78b06e2032e05b33d9fe87ff53260c9a87ab3c2432c9589b8
font_02_sfnt_off000114b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x114B5 10916 bytes
SHA-256: b143e78310e57c2e1f31d260a391cdacc808febfbb78be629707eb52bffbe68b