Malicious PDF — malware analysis report

Static analysis result for SHA-256 3820d195d79b178f…

MALICIOUS

PDF

71.8 KB Created: 2021-09-18 03:23:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-24
MD5: ec9b08d3a8d233d05789249034237c45 SHA-1: 3e87bb4308ebc6adaa429e12754c891483ed25d9 SHA-256: 3820d195d79b178f0fff0e810fe60b49ed41b0442da9b27a39d75adde3babf52
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 0.9942

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 https://www.casestilistas.es/ckfinder/userfiles/files/kixakoragubi.pdf In PDF document text
    • http://hospitalityroyal.com/upload_files/file/didojawogod.pdfIn PDF document text
    • https://promaxsuspension.com/csmimage/file/mevaxosakotapakituf.pdfIn PDF document text
    • http://a2hgghk.handylover.com/upload/files/94167688884.pdfIn PDF document text
    • https://alohasafaris.com/files/jemonalinajazafajebuf.pdfIn PDF document text
    • https://faresaldabbous.com/uploads/file/19761513618.pdfIn PDF document text
    • http://flixgolf.com/ckeditor/ckfinder/userfiles/files/tolarimosozag.pdfIn PDF document text
    • http://www.fd.ntou.edu.tw/ckfinder/userfiles/files/54460956495.pdfIn PDF document text
    • http://www.dagmarsvendova.cz/admin/js/ckfinder/userfiles/files/9640196074.pdfIn PDF document text
    • http://www.masozilina.sk/ckfinder/userfiles/files/64743949806.pdfIn PDF document text
    • http://kientrucnhacuagio.com/upload/files/45439297691.pdfIn PDF document text
    • https://endobible.com/userfiles/file/wunex.pdfIn PDF document text
    • http://bajajsports.com/userfiles/file/gokidetutupotamotu.pdfIn PDF document text
    • https://jv-cms.crazy-jessie.nl/uploads/files/suretupadutuvemavisak.pdfIn PDF document text
    • http://fkjz.cn/upload/files/2021/09/202109021504064753.pdfIn PDF document text
    • http://a1climbing.com/userfiles/files/worususibivusuwo.pdfIn PDF document text
    • https://cahayamimpi1.com/contents/files/41212473020.pdfIn PDF document text
    • http://sunwisechem.com/Uploadfiles/files/47164598021.pdfIn PDF document text
    • http://nhasachthunam.com/upload/files/lifenuximulebubejitivoz.pdfIn PDF document text
    • http://meimagedance.tw/ufiles/files/36228977517.pdfIn PDF document text
    • http://ventiliatoriai.lt/js/ckfinder/userfiles/files/65378310658.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=social+science+book+for+class+6+samacheer+kalviPDF link annotation
    • https://www.thc.gda.pl/ckfinder/userfiles/files/27678936138.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ade6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xADE6 11044 bytes
SHA-256: ac4b85fee320a273af53b6d318e43b6d9aac416b3904975c45e3b4a6891f45f8
font_01_sfnt_off0000c75f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC75F 16720 bytes
SHA-256: 152f45310783419bb63ba9cfceba30a95ec459141ae750d60641b65087e87ee7
font_02_sfnt_off0000f0e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0E9 1776 bytes
SHA-256: 5df3691c8e7c4cbc28bd9a15813b86c32f5266304be0e6eca3494cebcd22c3f2
font_03_sfnt_off0000f945.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF945 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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