Malicious PDF — malware analysis report

Static analysis result for SHA-256 cb17b952db7e958f…

MALICIOUS

PDF

76.9 KB Created: 2021-09-27 22:50:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 853c755d6192187b3215529b8d5e66ba SHA-1: 6b71fe2a8957bc69892a723c94fe35d8e0ad132d SHA-256: cb17b952db7e958f37162fda52b47dcbbf55d64e0430707ae6b25d9313e76dd7
166 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external resources, many of which are hosted on disposable domains and appear to be part of a link farm. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and heuristic firings suggest it's designed to trick users into visiting malicious URLs, potentially leading to further compromise.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF link to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://kingbikeonline.com/images/upload/File/ropar.pdf In PDF document text
    • http://lonerangerfanclub.com/ckfinder/userfiles/files/53367228111.pdfIn PDF document text
    • http://nghiencuuykhoa.com/uploads/userfiles/file/32458387789.pdfIn PDF document text
    • https://www.acta-mobilier.fr/ckfinder/userfiles/files/dotupobunegipanisom.pdfIn PDF document text
    • https://www.bbmnetlicitacoes.com.br/cms/ckfinder/upload/files/18158791283.pdfIn PDF document text
    • https://edex.co/userfiles/files/losutafenupurokigatekapo.pdfIn PDF document text
    • http://atomiccm.com/userfiles/files/11085520554.pdfIn PDF document text
    • http://studiomedicoveterinariobellucci.eu/userfiles/files/58304382408.pdfIn PDF document text
    • https://a-1commercialkitchenservices.com/ckfinder/userfiles/files/17202748178.pdfIn PDF document text
    • http://lifebeachvilla.com/uploads/image/files/gotodamopeb.pdfIn PDF document text
    • http://fixmyhelicopter.com/project-new/christianbook/upload_images/file/dadotudemele.pdfIn PDF document text
    • https://staffxrecruitment.com/wp-content/plugins/super-forms/uploads/php/files/acf86cf57cabd2c97755664ae32ed860/surugebomeritavejirel.pdfIn PDF document text
    • https://chanty.dacola.com/upload/files/nativojijibitalunomepap.pdfIn PDF document text
    • https://sluganarodu.org/userfiles/files/biwetilevijufifusabiteti.pdfIn PDF document text
    • http://icbiz.ru/userfiles/file/sadazunoxutu.pdfIn PDF document text
    • http://gancza.pl/userfiles/file/42304131416.pdfIn PDF document text
    • https://bestcoloringpages.com/userfiles/file/xivik.pdfIn PDF document text
    • http://csim.jp/ckeditor/uploads/files/73795016487.pdfIn PDF document text
    • http://boxerdapolenta.com/cmsimple/images/file/gufibogogopaz.pdfIn PDF document text
    • http://krindustria.com.br/site/wp-content/plugins/formcraft/file-upload/server/content/files/1614aff0bb193f---16223849362.pdfIn PDF document text
    • http://mpti.ru/userfiles/file/mopikotifagogexatu.pdfIn PDF document text
    • https://khambenhxahoi115.com/images/files/55081316025.pdfIn PDF document text
    • https://siriusdynamics.com/assets/uploads/files/61558270680.pdfIn PDF document text
    • https://medtek.vn/storage/file/lukojaxaxos.pdfIn PDF document text
    • http://cctechlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/tojelorisi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=download+apex+launcher+pro+mod+apkPDF 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_off0000c382.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC382 18384 bytes
SHA-256: e9aaeece205e6f2f717aa0aa089108325c2f800aeace3b93c7c2d9d741eb1aee
font_01_sfnt_off0000f2ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2CA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010ae1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10AE1 10804 bytes
SHA-256: 486a529051219b7fa566976c6cfa75dc687698d0dd370bef76f65f2c0957c5dc