Malicious PDF — malware analysis report

Static analysis result for SHA-256 10071c477862bc2a…

MALICIOUS

PDF

78.4 KB Created: 2021-09-13 10:10:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 643b6178f257dd0dbaa494e9cae4dd78 SHA-1: 74538dbd0a4b8e76c8934007daf637656be0adfb SHA-256: 10071c477862bc2a81a0abd77a994d46a453bae29970ab41d68484d668d80c80
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. The PDF contains numerous embedded URLs, many of which are hosted on potentially disposable domains, suggesting a link farm used for phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9958

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 http://restauraceeverest.cz/userfiles/file/lijatavipumefezafolifeniw.pdf In PDF document text
    • https://bunexim.dascalita.ro/app/webroot/files/userfiles/files/63063694717.pdfIn PDF document text
    • http://scouttautomotive.com/editor_uploads/system/files/losamezamogalazur.pdfIn PDF document text
    • http://www.ville-dammarie.com/ckfinder/userfiles/files/rixugabajawavenoxati.pdfIn PDF document text
    • http://toitureetfacade.fr/data/Files/jofojatugalaledal.pdfIn PDF document text
    • http://itkaufmann.com/images/fckimages/file/tofifunibufugirop.pdfIn PDF document text
    • https://autoteam.in/ckfinder/userfiles/files/ruwafidupavotinasupogog.pdfIn PDF document text
    • https://laptopserwis.com/app/webroot/media/files/jojafitudotilebagutogora.pdfIn PDF document text
    • http://lukinserv.hu/file/91922309973.pdfIn PDF document text
    • http://memsports.com.br/admin/libs/ckeditor/ckfinder/files/99507324515.pdfIn PDF document text
    • https://www.chortho.co.uk/wp-content/plugins/super-forms/uploads/php/files/5qj13h0sl4bk1f1ui67mqv3b25/navawudabupa.pdfIn PDF document text
    • http://abwhopewell.com/uploads/files/70177609411.pdfIn PDF document text
    • https://digireg.es/upload/23752558890.pdfIn PDF document text
    • https://vico-domrep.com/ckfinder/userfiles/files/14477486493.pdfIn PDF document text
    • http://cmtl.in/uploads/userfiles/file/file/fowosemafevopewojulikivu.pdfIn PDF document text
    • http://sbsinternationalschool.org/userfiles/file/9126466083.pdfIn PDF document text
    • https://maytinhdalat.vn/images/uploads/files/dajesowowimoxaxewusujovaj.pdfIn PDF document text
    • http://leap-egypt.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613dd20c342d0---likugirutasifosikaf.pdfIn PDF document text
    • http://beauty214.com/uploads/files/202109121156397244.pdfIn PDF document text
    • https://toananhmedical.com/uploads/files/zapanabolefego.pdfIn PDF document text
    • http://aristosaigonhotel.vn/uploads/files/34762608535.pdfIn PDF document text
    • https://architektor.ru/uploads/file/folod.pdfIn PDF document text
    • http://52963566.com/upload/file/202109011255540600.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=outlook+sign+in+email+login+emailPDF 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_off0000cf3f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF3F 17524 bytes
SHA-256: aedcde67241d88180fe974efef0ce19d12621fc151256fef4d5bbb5d56c65bf2
font_01_sfnt_off0000fc38.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC38 10568 bytes
SHA-256: 9f2b019814ef508bc05fc09eaf25fc33e97c78d1763251c99b4e8d6ebc281773
font_02_sfnt_off0001145c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1145C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1