Malicious PDF — malware analysis report

Static analysis result for SHA-256 3c4ac5b6c5fce29f…

MALICIOUS

PDF

79.1 KB Created: 2021-09-08 14:31:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-25
MD5: 4933b296672f62e1417c01bd1291bb13 SHA-1: 030933cba8f7983ee004467f429b3c80ae9f12f9 SHA-256: 3c4ac5b6c5fce29fcb86015bbc6c315eb01e8b4f4b0ac415fcf78ed92d545121
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

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 and contains embedded JavaScript. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 6

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://ucokampen.com/media/files/10295719208.pdf In PDF document text
    • https://next-engineering.com/userfiles/files/75559898602.pdfIn PDF document text
    • http://2446665a.ru/ckfinder/userfiles/files/jurubabixog.pdfIn PDF document text
    • http://elistaprezentow.pl/userfiles/file/rurotufagejinaretadoburi.pdfIn PDF document text
    • http://onlineticketreview.com/images/file/36845943394.pdfIn PDF document text
    • http://adasbruiloften.nl/userfiles/file/pibipixifedavolemi.pdfIn PDF document text
    • http://risme.vn/files/93543151313.pdfIn PDF document text
    • https://zemtechnika.lt/public/site/0files/42519453605.pdfIn PDF document text
    • http://elistaprezentow.pl/userfiles/file/17712829770.pdfIn PDF document text
    • http://anchor-m.com/js/upload/files/nadataxazijanimozejome.pdfIn PDF document text
    • http://redemaisfarma.com/userfiles/file/85370195145.pdfIn PDF document text
    • https://ccskin.com/geektic/files/21231374488.pdfIn PDF document text
    • http://semihkerpiccilervesupersound.com/upload/file/73909329496.pdfIn PDF document text
    • http://metallpress.info/files/70780239363.pdfIn PDF document text
    • http://evo-models.com/uploads/userfiles/files/82508267288.pdfIn PDF document text
    • https://emprenderem.cl/files/gepugasafixemuvutijesu.pdfIn PDF document text
    • http://www.s-prom.si/fileupload/file/96836116924.pdfIn PDF document text
    • http://mq-water.net/upload/jepijikinopimovuzakuxe.pdfIn PDF document text
    • https://www.agencesramos.com/ckfinder/userfiles/files/duwekovikometazosamozoz.pdfIn PDF document text
    • http://aldo-ins.com/userfiles/file/metamixetazepugefojez.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=bryophytes+by+vashishta+pdf+downloadPDF 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_off0000cc1b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC1B 18324 bytes
SHA-256: e410c91edd94591c84cac95aec958862015dc81f8ac47119e17f94c50a32b94f
font_01_sfnt_off0000fbc9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBC9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000113e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x113E0 11056 bytes
SHA-256: 4679f543afaf8841f400f0c1e71bd5f13f5fd361a200a204cc35a04b5ad4a207

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