Malicious PDF — malware analysis report

Static analysis result for SHA-256 e47a539b134b9d58…

MALICIOUS

PDF

79.3 KB Created: 2021-09-17 08:55:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 2a48303400ab44b9f45031b693f6e53b SHA-1: e82f0a5f2c7dec290ae13b2dd91581bebb158da6 SHA-256: e47a539b134b9d58d3a69c24fae3e9565e991a2128cfc8baf4910c64f2f582c4
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is often used to redirect users to malicious websites. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' and the numerous unknown URLs suggest a phishing or scam attempt to drive traffic to potentially malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://studiocalcinoni.com/userfiles/files/69283145590.pdf In PDF document text
    • https://divorcioconsensual.com.br/wp-content/plugins/super-forms/uploads/php/files/bb5ac0be9404fecfe6cb8f437238fa85/navudinu.pdfIn PDF document text
    • http://stonebreaker.at/97687637665.pdfIn PDF document text
    • http://t-cso.com/upload/file_folder/file/83799258568.pdfIn PDF document text
    • https://bohemiamaestro.com/webpagebuilder/ckfinder/userfiles/files/bobilibimusabowotipod.pdfIn PDF document text
    • http://goang-hann.com/uploads/files/202109041509125315.pdfIn PDF document text
    • http://cathyknightwaite.com/ckfinder/userfiles/files/sujedibitakanemefajaja.pdfIn PDF document text
    • http://inteko-tula.ru/f/file/mowidu.pdfIn PDF document text
    • https://novahealthclinic.ca/userfiles/file/raborufitoniwaxujununud.pdfIn PDF document text
    • http://hosungtour.com/FileData/ckfinder/files/20210911_E51771E7F1F7C649.pdfIn PDF document text
    • https://lotusmarinevn.com/upload/files/jevij.pdfIn PDF document text
    • http://journalofcritique.com/ckdosyalari/upload/files/35140508979.pdfIn PDF document text
    • http://sun-tes.ru/files/file/41260933531.pdfIn PDF document text
    • http://abwmechanicsville.com/uploads/files/76326097707.pdfIn PDF document text
    • https://saksisan.com/upload/ckfinder/files/xanegubojeroninavikabuwav.pdfIn PDF document text
    • https://rescue.bg/wp-content/plugins/formcraft/file-upload/server/content/files/161381618a561c---89958419285.pdfIn PDF document text
    • https://chinatupai.com/web/js/ckfinder/userfiles/files/mepamijilasubuwexozo.pdfIn PDF document text
    • https://mywayrtk.com/userfiles/file/79305177674.pdfIn PDF document text
    • http://elistaprezentow.pl/userfiles/file/xupus.pdfIn PDF document text
    • https://myparrotfood.com/user_files/files/34903890693.pdfIn PDF document text
    • https://fishuntpesca.it/file/19540076683.pdfIn PDF document text
    • http://www.addvanceo.info/userfiles/files/94773371517.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=how+to+undo+deleted+text+on+androidPDF 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_off0000d1fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD1FD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ea14.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA14 10352 bytes
SHA-256: 6e490f243792fee3db338db71aad304bd569d75c3829b309550486a9fe914aa9
font_02_sfnt_off00010190.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10190 17788 bytes
SHA-256: 06d4badd56405a53d373a6422d00638cca73727098ecd292f1f6335fedd72b96

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