Malicious PDF — malware analysis report

Static analysis result for SHA-256 59b37cd1d33bb90c…

MALICIOUS

PDF

70.6 KB Created: 2021-10-02 11:43:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 6ed75016afed80e5cb8cf7faf96b2b94 SHA-1: bf6570b7a1187482c2e21fdb8f6e1588f4542ad3 SHA-256: 59b37cd1d33bb90c8fd98e52a557a9eb98eafea09ef6c098bd77e2abc6365e99
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is a common technique for malicious PDFs to execute code or redirect users. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates the PDF is part of a network of links pointing to other PDF files, suggesting a coordinated effort for SEO manipulation or malware distribution. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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://daiduongmetal.com/uploads/ckfinder/files/11097852086.pdf In PDF document text
    • https://wasael.com/userfiles/file/84785218716.pdfIn PDF document text
    • http://kargo-box.com/uploads/files/54406036621.pdfIn PDF document text
    • http://cpils.com/userfiles/file/94159481748.pdfIn PDF document text
    • http://szkolaprzybranowo.pl/ckfinder/userfiles/files/55863803012.pdfIn PDF document text
    • http://scarpatti.com/files/22293117469.pdfIn PDF document text
    • http://hongsung114.com/files/fckeditor/file/46056378505.pdfIn PDF document text
    • http://railwaysrailroads.com/upload_files/files/51867831368.pdfIn PDF document text
    • https://mihalex.by/files/files/vagagukijizuwexaw.pdfIn PDF document text
    • https://immo-macedo.lu/userfiles/files/69144123595.pdfIn PDF document text
    • http://kanizsakran.hu/userfiles/file/jotetepe.pdfIn PDF document text
    • http://quimis.net/js/ckfinder/userfiles/files/nebutugosedawe.pdfIn PDF document text
    • https://zoldlaptop.hu/ckfinder/userfiles/files/63010043212.pdfIn PDF document text
    • https://beautifullifeuk.com/wp-content/plugins/super-forms/uploads/php/files/af34c8edd70b9cc5c8b1020121bfff5d/pavibekinamowak.pdfIn PDF document text
    • http://lyzph.com/userfiles/file/Fl202109230137386432.pdfIn PDF document text
    • http://doubles301.jp/files/ckeditor/files/55082939144.pdfIn PDF document text
    • https://fratellifurloni.it/file/34933771909.pdfIn PDF document text
    • https://livewireeventz.com/userfiles/file/81295664002.pdfIn PDF document text
    • https://durgabas.coop.np/ckfinder/userfiles/files/gotukegipenitimuxuwe.pdfIn PDF document text
    • http://www.onekaddy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614e2bf5ae120---53790512671.pdfIn PDF document text
    • https://mn-lawfirm.com/box/userfiles/file/61439168790.pdfIn PDF document text
    • http://apluskleaning.com/admin/images/file/41617598928.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=nhs+band+6+interview+questions+and+answersPDF 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_off0000b134.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB134 10980 bytes
SHA-256: 563404f3e1edbb10e3be2c8e4c9216243ac156f7c00fe809eb31ab99572bfd4b
font_01_sfnt_off0000ca8c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA8C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e29e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE29E 16588 bytes
SHA-256: a28e9a02ac4f15dfd7709027c6d566bbaf131a520fc76b9ad9ab49735be590da

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