Malicious PDF — malware analysis report

Static analysis result for SHA-256 70e3e2820deb90f6…

MALICIOUS

PDF

72.9 KB Created: 2021-09-18 13:48:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 7dd1de2ea6d7fdf1de34fff3886da981 SHA-1: ec7c9355172274e953eff11bb25555aebb163494 SHA-256: 70e3e2820deb90f647e07417bb3918419edf3b3a98b8709894d9749a851bfee0
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, with a high ML classifier score and ClamAV detection indicating malicious intent. The document's structure and the presence of many links on disposable hosting suggest it functions as a link farm, likely to distribute malware or conduct phishing by redirecting users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://autopsrus.com/ckfinder/userfiles/files/wuwodofew.pdf In PDF document text
    • http://www.icareonline.net.au/ckfinder/icare/files/semufoz.pdfIn PDF document text
    • http://dieta-plus.pl/userfiles/file/104273920.pdfIn PDF document text
    • http://vindindex.nl/images/uploads/lekazipasexogufed.pdfIn PDF document text
    • https://ctcitsupport.com/media/files/zegovukajizavezut.pdfIn PDF document text
    • https://diedacorporation.net/freesiafiles/file/xejadomeroxodu.pdfIn PDF document text
    • http://k-ookuma.com/js/upload/files/29555549370.pdfIn PDF document text
    • https://sakesushimn.com/userfiles/files/bosulinir.pdfIn PDF document text
    • https://xn--78-6kce7dfhb9dwb.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/205c8ef56efd4a6c52b78ae669176f4c/9617307985.pdfIn PDF document text
    • https://cevhertemizlik.com/userfiles/files/duwevironuriso.pdfIn PDF document text
    • https://thomsonindia.com/userfiles/files/bipetelogepe.pdfIn PDF document text
    • http://poetische-malerei.de/web/editor/files/15067405865.pdfIn PDF document text
    • https://naveenent.com/administrator/imagetemp/file/91500632398.pdfIn PDF document text
    • http://yogathoitrang.com/quangbasanpham/app/webroot/upload/image/files/12791490560.pdfIn PDF document text
    • https://living-stone.lu/userfiles/files/33979655284.pdfIn PDF document text
    • http://facilitymanagementassociates.com/survey/userfiles/files/96329691115.pdfIn PDF document text
    • http://dkmmotor.com/files/userfiles/file/wewun.pdfIn PDF document text
    • http://romento.com/uploaded_files/userfiles/files/rupijipalalututewujiwes.pdfIn PDF document text
    • http://helder-effect.nl/userfiles/file/bewefijudiweto.pdfIn PDF document text
    • http://problemconsulting.com/img/download/files/93889875782.pdfIn PDF document text
    • https://mobilieroccasion.fr/uploads/file/kujuxemepanumugoxisete.pdfIn PDF document text
    • http://www.gainerwindows.ca/wp-content/plugins/super-forms/uploads/php/files/s9mp8buohc4rluh06cb9p04et4/vedefubuvuwedolizerageru.pdfIn PDF document text
    • http://espokebar.com/uploads/files/7173264847.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=download+mod+stickman+warriorsPDF 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_off0000bb0c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBB0C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d323.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD323 10580 bytes
SHA-256: 85db4382ad0471b5998223eb1a86d3f18a01ac998a12ffc1cebb1e811dc553cc
font_02_sfnt_off0000eb4c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB4C 16544 bytes
SHA-256: b3f8ce6665b55f044dc1e509ee1e8e17746c1b4ecc4893ad3bd84f5aa4789e15

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