Malicious PDF — malware analysis report

Static analysis result for SHA-256 264cf5f30925a4a6…

MALICIOUS

PDF

80.2 KB Created: 2021-09-10 21:01:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: d4663ac347d8887f5e07075646539925 SHA-1: 4496bf6007e1d3dffc223484b82ff0dffc217068 SHA-256: 264cf5f30925a4a6cf205b56940aebeac4ba105fbcb42f76288b58f202f713e0
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a high number of external URIs, many of which are hosted on disposable domains, indicating a link farm or phishing attempt. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to redirect users to malicious sites for further exploitation or credential harvesting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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 http://tokstar.com/_UploadFile/Images/file/47397303574.pdf In PDF document text
    • http://zhouzhuanx.com/v15/Upload/file/202193353466678.pdfIn PDF document text
    • https://rockyhotelsgroup.com/uploaded/files/jebivos.pdfIn PDF document text
    • http://www.onegelha.com/wp-content/plugins/super-forms/uploads/php/files/275db8fe1030f0c98e7b3d6524ad1ca8/66458754797.pdfIn PDF document text
    • https://liho.cz/UserFiles/File/50756294423.pdfIn PDF document text
    • https://www.idromeccanicasrl.com/idromeccanicasrl.com/wp-content/plugins/super-forms/uploads/php/files/a573e4fc0ff4c2e4a68c3396813fbdc4/pimizito.pdfIn PDF document text
    • http://tmkb.org.tr/ckfinder/userfiles/files/todugofodutagobozoko.pdfIn PDF document text
    • https://www.zaantraining.nl/wp-content/plugins/formcraft/file-upload/server/content/files/161313f1217a9a---jeluboxapamituxoxuratu.pdfIn PDF document text
    • http://www.leasebridge.com/CKUPimg/files/meborefuribika.pdfIn PDF document text
    • https://edex.co/userfiles/files/45686451244.pdfIn PDF document text
    • https://diarch.in/WYSIWYGImage/file/4495111901.pdfIn PDF document text
    • https://xn--bankkrtya-41a.hu/js/ckfinder/userfiles/files/kifenud.pdfIn PDF document text
    • https://cncunse.com/d/files/jodisewom.pdfIn PDF document text
    • http://www.adarshvidhyasankul.org/userfilesfile/sotovigamusavobebigopati.pdfIn PDF document text
    • https://tramtron.vn/uploads/files/files/buguxebu.pdfIn PDF document text
    • http://laskod.hu/userfiles/file/fadafoxusu.pdfIn PDF document text
    • http://gzbaosui.com/uploadfile/files/83830463938.pdfIn PDF document text
    • http://101eyewear.com/luutru/files/gabokosisewerewefubuxukid.pdfIn PDF document text
    • https://pepsima.biz/files/file/mopakefobisoliravap.pdfIn PDF document text
    • http://adamslakeband.org/userfiles/file/xuwerutinedibowugabokoriz.pdfIn PDF document text
    • http://klubalfa.org/img/userfiles/file/batitikowosami.pdfIn PDF document text
    • http://woodbridgeabw.com/uploads/files/47799662949.pdfIn PDF document text
    • http://www.multigacos.com/admin/uploaded/fck/file/97717626313.pdfIn PDF document text
    • http://fantasymusic.it/userfiles/files/92745537768.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=shader+realistic+minecraft+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_off0000d6a9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6A9 10816 bytes
SHA-256: 5e72a639ade76e3e503c217464f4ee42d3dcc73eee3222267fd651a48f82c747
font_01_sfnt_off0000ef5d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF5D 16788 bytes
SHA-256: 9baab95031f9dd399d93dce19803ca96490fe0d49478216eb4eb3c21c1ad945c
font_02_sfnt_off00011afb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11AFB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1