Malicious PDF — malware analysis report

Static analysis result for SHA-256 ee4c131d4bcb13e5…

MALICIOUS

PDF

82.0 KB Created: 2021-09-11 05:46:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 25eae4c19caba19f4f91e38bda9d3dea SHA-1: 857527d2263ea540b3cd3a39a56fd931cccbbbbe SHA-256: ee4c131d4bcb13e5909c5da6ae7281007860260d6b85ad0678569a84dc061871
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, a common technique for malicious PDFs to execute code. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' and the numerous unknown URLs indicate a likely phishing or malware distribution scheme. The ML classifier and ClamAV detection strongly support the malicious verdict.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://carmelocuritiba.com.br/ckfinder/userfiles/files/dopukudopomabasoruborod.pdf In PDF document text
    • https://leciv.fr/uploads/FCK_files/file/raveg.pdfIn PDF document text
    • https://nibrasimansch.com/userfiles/files/44058875093.pdfIn PDF document text
    • https://chinatupai.com/web/js/ckfinder/userfiles/files/79131563799.pdfIn PDF document text
    • http://novosib-sport.ru/ckfinder/userfiles/files/kovexudakalexage.pdfIn PDF document text
    • http://studiopedrazzini.eu/userfiles/files/xumanixun.pdfIn PDF document text
    • http://kermiradiatoriai.lt/images/files/tuzejog.pdfIn PDF document text
    • http://techcessgroups.com/userfiles/file/mureguzavewavimas.pdfIn PDF document text
    • http://dentalcenterstudio.it/userfiles/files/16234359465.pdfIn PDF document text
    • http://tiszaladany.hu/upload/file/piwudepasazamokevejelaw.pdfIn PDF document text
    • http://www.firstpages.eu/app/webroot/files/userfiles/files/xirilusawifafubenugupa.pdfIn PDF document text
    • https://calienglish.com/ckfinder/images_store/files/penanegulo.pdfIn PDF document text
    • https://thefertilizerproductionline.com/d/files/lijonupozuduxeravutozef.pdfIn PDF document text
    • http://benetworkingpro.com/ckfinder/userfiles/files/jerixabodusipafinugixipe.pdfIn PDF document text
    • https://zevkotodoseme.com/upload/ckfinder/files/89948671810.pdfIn PDF document text
    • http://techbico.vn/uploads/image/files/532989121.pdfIn PDF document text
    • http://atlonnuri.org/UpLoadImage/editer/files/xagiwetitedezovutuvi.pdfIn PDF document text
    • http://rszm88.com/upfolder/e/files/20210911040430.pdfIn PDF document text
    • http://cestovni-postylka.eu/userfiles/file/bafigerisujuno.pdfIn PDF document text
    • http://www.nuricomuvakfi.org/wp-content/plugins/super-forms/uploads/php/files/fdbb9leaaocdi5o01op8ggqu56/pomifimanezapijokuzufexep.pdfIn PDF document text
    • https://sma-dfgg.org/site/admin/file/41112371460.pdfIn PDF document text
    • http://martonaroniskola.net/userfiles/file/jisededazejoligir.pdfIn PDF document text
    • http://villacappuccina.com/userfiles/files/58179704260.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=how+to+record+internal+sound+in+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_off0000dc69.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC69 17604 bytes
SHA-256: 656d4b7496171ddcb4f4c3771bc6a71f8255a156cfd90ed6bbb7766e1a119636
font_01_sfnt_off000109fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109FE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012215.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12215 10540 bytes
SHA-256: ab426c19954af27cb222cb4adbb5feb9d3d868b2f75ebe70a9cba8228cfd8416

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