Malicious PDF — malware analysis report

Static analysis result for SHA-256 faa57be5ef96445a…

MALICIOUS

PDF

85.2 KB Created: 2021-09-17 13:04:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: ddec6e4c349d035514f8a677e5cca4ae SHA-1: d78960e8f97082c519e6e594ae2bd3c6eff71e3c SHA-256: faa57be5ef96445ad7e95ac2bc425f194eb191ed24fbbf0c1c489b3e45010dd6
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to link farms on disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent. The embedded JavaScript likely facilitates the redirection to these malicious sites, which are characteristic of phishing or malware distribution campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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 http://medob.org/SITE/files/editor/file/4116450731.pdf In PDF document text
    • http://bilafafafa.com/shopadmin/upload/files/losemogoj.pdfIn PDF document text
    • https://texasbordervolunteers.org/userfiles/file/morazuxug.pdfIn PDF document text
    • http://vistobrasil.net/uploads/file/61205902731.pdfIn PDF document text
    • http://fra2ange.it/userfiles/files/32128731620.pdfIn PDF document text
    • http://odnoklassniki-files.ru/images/uploads/files/sapelatibijepisudave.pdfIn PDF document text
    • http://ever-pioneer.com/upload/files/tipusafikitofuz.pdfIn PDF document text
    • http://www.stsmcc.org/www/js/ckfinder/userfiles/files/pivuri.pdfIn PDF document text
    • http://huucodatlanh.com/userfiles/file/lagev.pdfIn PDF document text
    • http://xn--aknmedical-yub.com/uploads/file/19498317128.pdfIn PDF document text
    • http://www.pethouse.es/ckfinder/userfiles/files/toginolekosesela.pdfIn PDF document text
    • http://miyozenemeryville.com/uploads/files/zowironivovav.pdfIn PDF document text
    • http://scard.vn/app/webroot/uploads/files/belodigorajowaj.pdfIn PDF document text
    • https://rosebankprimary.co.za/inc/ckfinder/userfiles/files/pukufamaxasej.pdfIn PDF document text
    • http://firmen-bekleidung.at/userfiles/file/lovozufol.pdfIn PDF document text
    • http://coimbrasoftware.hu/images/uploads/files/selajewidadumal.pdfIn PDF document text
    • http://www.iamgoingto1996.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612ea525652af---56216045454.pdfIn PDF document text
    • https://maintogelonline2.org/contents/files/xipiselobobibum.pdfIn PDF document text
    • http://sunil.kr/uploadfile/fckeditor/file/pisiretediruroxemidezizu.pdfIn PDF document text
    • http://motolargo.pl/userfiles/file/12121185331.pdfIn PDF document text
    • http://rspon.pl/images/wyswig_images/file/74449023432.pdfIn PDF document text
    • https://mcq.bmtinhoc.vn/InteriorWeb/images/images_news/files/lulijefabe.pdfIn PDF document text
    • http://dh-cell.com/ckfinder/userfiles/files/vawezukaki.pdfIn PDF document text
    • http://plenar.hr/wp-content/plugins/formcraft/file-upload/server/content/files/161350f6a9d447---17375433038.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=best+android+app+to+backup+text+messagesPDF 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_off0000e99c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE99C 16480 bytes
SHA-256: 0d7ef94c98c2e14a13e6158d5bdee7ee70a1f6c580c591508d7cb665429aee49
font_01_sfnt_off0001146b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1146B 11300 bytes
SHA-256: 3bf2749fd6a00cfa43d797d424769ea4239a21044ec85c0890424f0c9e3a9bfb
font_02_sfnt_off00012e99.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E99 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1