Malicious PDF — malware analysis report

Static analysis result for SHA-256 8f3099090841f925…

MALICIOUS

PDF

81.0 KB Created: 2021-09-12 10:31:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 18426ba82c37645dc87096c0782d8ebe SHA-1: 4d10428b56fe55434a8ebc9c56dc83e0a13d0983 SHA-256: 8f3099090841f9257b4fc13c4ae79e5f48751107446e0b4a05f8745bf4fe042a
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is a common technique for delivering malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent. The presence of numerous external links, many pointing to PDF files on potentially disposable domains, suggests a phishing or credential harvesting attempt, likely delivered as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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
  • 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://lixtech.com.tw/ckfinder/ckfiles/files/dojezamozimatuzevina.pdf In PDF document text
    • http://koryosushi.com/uploads/files/16078848677.pdfIn PDF document text
    • http://patrickstaxi.fr/userfiles/file/80041494874.pdfIn PDF document text
    • https://bluetact.com/ckfinder/userfiles/files/tezisux.pdfIn PDF document text
    • http://lachina.cn/upload/file/15345544392.pdfIn PDF document text
    • https://perleyparish.org/wp-content/plugins/super-forms/uploads/php/files/2356286afcd017b577fd4ec54bcfc447/werorolidaf.pdfIn PDF document text
    • https://cosmopolitanhotelbg.lastrada.bg/uploads/wysiwyg/files/sipumunofafijokide.pdfIn PDF document text
    • http://cold.lt/userfiles/file/gasiwesovufidetuk.pdfIn PDF document text
    • http://classiccar-jp.com/js/upload/files/7185658556.pdfIn PDF document text
    • http://kortennis.co.kr/B/ck/ckfinder/userfiles/files/bugimosuka.pdfIn PDF document text
    • https://kolkataangikar.org/ckfinder/userfiles/files/58315949042.pdfIn PDF document text
    • https://mamo-tato.ro/userfiles/file/50449171977.pdfIn PDF document text
    • https://cardolf.ro/files/47015919986.pdfIn PDF document text
    • https://razredna-nastava.net/files/58495737385.pdfIn PDF document text
    • http://www.chiringuitomediterraneo.com/ckfinder/userfiles/files/bazipimomelogise.pdfIn PDF document text
    • http://tinavaron.com/ckfinder/userfiles/files/veluzeg.pdfIn PDF document text
    • https://clickbox.ro/images/file/zusoveziw.pdfIn PDF document text
    • https://amezdigital.com/wp-content/plugins/super-forms/uploads/php/files/9abc56eaa215ab42dba1cb41fc3e3f48/wafolusotomovowasor.pdfIn PDF document text
    • http://355353.ru/userfiles/file/69943441903.pdfIn PDF document text
    • https://alummaswaja.com/yii/sdbalikpapan/home/images/upload/files/fajolabinudut.pdfIn PDF document text
    • http://terminsk.by/pics/files/dekutetilofatezubilagunu.pdfIn PDF document text
    • https://bomberosdenavarra.com/userfiles_nexo/files/riginajonepixamepakegur.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=pubg+global+apk+obbPDF 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_off0000d8a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8A8 10064 bytes
SHA-256: c3462dde327240b177a5b4beebd06cddedd5e8f0b0486c3f7148110d8c68f027
font_01_sfnt_off0000eee7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEE7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000106f9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106F9 18016 bytes
SHA-256: 3992aa97ecedfc1440187c85570eca0720c866c9882aac0e21b7ca75b709af2a

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