Malicious PDF — malware analysis report

Static analysis result for SHA-256 87c9e4e4cf793913…

MALICIOUS

PDF

79.3 KB Created: 2021-10-21 18:08:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 43a8688f0cba561d7296c9fa5d6ded16 SHA-1: fd097502a7e7219cee16e158dd2f515d2af39d79 SHA-256: 87c9e4e4cf793913b2d667fc6bae7c73e8f72c75c26664f890301c64db2ed9a3
166 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was identified as malicious by ClamAV and an ML classifier, exhibiting characteristics of a phishing lure. The PDF contains numerous links to other PDF files, suggesting it functions as a link farm designed to obscure the ultimate malicious destination. The heuristic 'SE_PASSWORD_ARCHIVE_LURE' indicates the document likely instructs the user to open a password-protected archive, a common tactic to bypass security filters.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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://bienchidan.org/uploads/files/18365709684.pdf In PDF document text
    • https://copacndg.com/images/uploads/files/jojipapamirav.pdfIn PDF document text
    • http://glavis.biz/userfiles/file/82817616408.pdfIn PDF document text
    • https://wonwon.taipei/photo/file/20562561357.pdfIn PDF document text
    • https://alves.bg/ckfinder/userfiles/files/13195616177.pdfIn PDF document text
    • https://barcelona-health.com/files/galeria/files/79802904331.pdfIn PDF document text
    • http://veterina-hrib.cz/user-uploads/files/18249686586.pdfIn PDF document text
    • http://ave-france.com/pics/files/55581037717.pdfIn PDF document text
    • http://wronba.com/uploads/wysiwyg/file/bagabosomajoban.pdfIn PDF document text
    • http://trivio.it/userfiles/files/detivupa.pdfIn PDF document text
    • http://altus.pl/userfiles/file/61697008686.pdfIn PDF document text
    • http://mishelik.ru/userfiles/file/nudetegotuboz.pdfIn PDF document text
    • http://eiak.org/upload/editor/files/xokevatodum.pdfIn PDF document text
    • http://bascobrunswick.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/161454d92a8de2---55801392390.pdfIn PDF document text
    • https://signika.pl/Upload/file/nuzoluvaki.pdfIn PDF document text
    • http://ssaisarang.com/ckfinder/userfiles/files/vopax.pdfIn PDF document text
    • https://linhquan-group.com/upload/ck/files/besex.pdfIn PDF document text
    • https://buyafranchise.org/files/files/32359080616.pdfIn PDF document text
    • https://bibonatura.hu/ckfinder/userfiles/files/vasimenebi.pdfIn PDF document text
    • http://www.marcado.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1613d09372e9b0---fexesufusurad.pdfIn PDF document text
    • http://feedproxy.google.com/~r/MbOu/~3/6Zflnl449io/uplcv?utm_term=then+and+now+worksheetPDF 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_off0000d230.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD230 10348 bytes
SHA-256: 6279a6d4fcd1755ee8adc733b29f5c516100d087ec4e1de583c6fbe5b1f9739d
font_01_sfnt_off0000e991.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE991 17832 bytes
SHA-256: 69d3c1d4b5ec65897c912f929d78dc470319f848249c089f99b83cb65b3cfe3c
font_02_sfnt_off000117b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x117B7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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