Malicious PDF — malware analysis report

Static analysis result for SHA-256 6ac224d905d0ffc4…

MALICIOUS

PDF

69.0 KB Created: 2021-09-16 20:09:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 96305eaba28d8344f23fd54886a15688 SHA-1: d1262fa72b20251b6df5b356ab10441fdbdc9e5c SHA-256: 6ac224d905d0ffc490bf574ce565a64e902e602419a3e97080e0cba12a19625c
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a high number of embedded URLs, many of which point to disposable or unknown domains, indicating a link farm designed to host malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with a phishing lure that redirects users to compromised or malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 5

  • 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.
  • 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://fsbulletsandbrass.com/userfiles/files/9830264797.pdf In PDF document text
    • https://latework.cz/soubory/67504750762.pdfIn PDF document text
    • https://cristalparkhotel.com/ckfinder/userfiles/files/2721599947.pdfIn PDF document text
    • http://stigstudiotecnico.it/userfiles/files/9801664354.pdfIn PDF document text
    • http://robedecreateur.com/img/files/sixorisewidus.pdfIn PDF document text
    • http://odnoklassniki-files.ru/images/uploads/files/pekuzepob.pdfIn PDF document text
    • http://www.electricman.in/demo/frontend/web/uploads/files/10088707735.pdfIn PDF document text
    • https://sdudyogtechnologies.in/ckfinder/userfiles/files/3115620485.pdfIn PDF document text
    • http://goldnumber.info/userfiles/file/67864942876.pdfIn PDF document text
    • http://ecompletecontact.com/ckfinder/userfiles/files/9922357990.pdfIn PDF document text
    • http://www.golfusa.be/userfiles/files/jeberiwategimavopumekivi.pdfIn PDF document text
    • https://portecitadelle.portecitadelle.ca/ckfinder/userfiles/files/23711819456.pdfIn PDF document text
    • https://lawrenceyezersky.com/userfiles/file/61383767922.pdfIn PDF document text
    • http://chuanghuilaw.com/filespath/files/20210912203814.pdfIn PDF document text
    • http://yyfxsw.com/upload/files/90801141569.pdfIn PDF document text
    • http://fairbank-ia.org/admin/ckfinder/userfiles/files/dojutosabumowuv.pdfIn PDF document text
    • http://xn--b1agaa2anfqdp.xn--p1ai/ckfinder/userfiles/files/fumokediviwebo.pdfIn PDF document text
    • https://chataigne-cevennes.fr/imgs/files/rujax.pdfIn PDF document text
    • http://kite-surf.sk/files/gijopaxibapagut.pdfIn PDF document text
    • https://0900107678.com/upload/file/rusevijalowujogedu.pdfIn PDF document text
    • http://stroi-sistema.ru/img/zilin.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=us+constitution+full+text+pdfPDF 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_off0000b035.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB035 15300 bytes
SHA-256: 2f05fd18038e54dbe9589d20bc8e14635d0a9e522352ff91c1c34427d3f7566c
font_01_sfnt_off0000d665.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD665 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000ee7c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE7C 10560 bytes
SHA-256: 5e22ac53c34d1c211e721ba8840172b18f81241f93960bd10c665a5b84eea786