Malicious PDF — malware analysis report

Static analysis result for SHA-256 2978d7d142591a4d…

MALICIOUS

PDF

81.9 KB Created: 2021-09-09 09:30:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: 05252b7f0683aa3ad0479888a10f1a00 SHA-1: 1f01150b56ab1c58f326988763e6049f3605fb57 SHA-256: 2978d7d142591a4db0d072b45e50c2ad1d2d6745c861ab46f37b648b60e397fd
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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 https://medvor.ru/uplcv?utm_term=a+well+labelled+diagram+of+the+digestive+system PDF link annotation
    • https://kolorubursztynu.kolorubursztynu.pl/web/uploads/files/dexazuruniwe.pdfIn PDF document text
    • http://kvbm.org/pds/userfiles/files/gogukedunasib.pdfIn PDF document text
    • https://ibextrail.com/editor-images/8767297655.pdfIn PDF document text
    • http://retailcop.ca/files/rosizedej.pdfIn PDF document text
    • https://luatsuavina.com/userfiles/file/75692040086.pdfIn PDF document text
    • http://xn--90aoaidn.xn--p1ai/ckfinder/userfiles/files/21363037489.pdfIn PDF document text
    • http://devison-matras.ru/upload/file/nozunuzepofefogomepoboj.pdfIn PDF document text
    • http://anhuifan.com/upload_fck/file/2021-9-1/20210901135619755664.pdfIn PDF document text
    • http://www.kymkarajok.net/tiedostot/files/vixuxevizuje.pdfIn PDF document text
    • http://businessplan-capalpha.eu/mbp/upload/images/images/upload/ckfinder/vixetab.pdfIn PDF document text
    • http://kiemdinhcan.com/Images_upload/files/33339076010.pdfIn PDF document text
    • https://mahae.hu/files/files/gigopugexozozubas.pdfIn PDF document text
    • http://sandsflooring.co.uk/ckfinder/userfiles/files/tibuxawudagiju.pdfIn PDF document text
    • https://acrgruppe.de/userfiles/file/kejitusitesarive.pdfIn PDF document text
    • https://projektovanje.info/userfiles/file/xarutesavozipudomurabe.pdfIn PDF document text
    • http://fazendasaojudastadeu.net/fotosempresa/files/legelifejanudux.pdfIn PDF document text
    • http://willbramephotography.com/zubavudunipo.pdfIn PDF document text
    • http://baoveantam.info/upload/files/8060512540.pdfIn PDF document text
    • https://www.mobytec.com.br/mobytec/wp-content/plugins/formcraft/file-upload/server/content/files/161386e46c165e---34253230371.pdfIn PDF document text
    • https://aspit.ro/imagini_ws/tutofudiguwojaz.pdfIn PDF document text
    • https://duext.com/wp-content/plugins/super-forms/uploads/php/files/9680d6c8519aaff8be7e114289070633/wexavivugawot.pdfIn PDF document text
    • https://acconpriti.com/ckfinder/userfiles/files/tudokovopimelixam.pdfIn PDF document text
    • http://cathugo.de/res/wysiwyg/file/531488882.pdfIn PDF document text
    • 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_off0000d7aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7AA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000efbc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFBC 18164 bytes
SHA-256: 78ee98cc824bf3de490eae8ad9c95d988a2fe7c8001e9e08cca0b22690a5265a
font_02_sfnt_off00011f03.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F03 11084 bytes
SHA-256: df217e7a59cbbf2857b9491a19f46ceff404bf3cbedad623753a3f65a459823a

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