Malicious PDF — malware analysis report

Static analysis result for SHA-256 23f89faefec3640e…

MALICIOUS

PDF

72.7 KB Created: 2021-09-25 18:24:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: fa2d88bb239b5004a00d3bf9966367d1 SHA-1: 979a5bb33f7b87bb07fcea7ce377c61074c91b8a SHA-256: 23f89faefec3640ee86308ddd16aa09440f889c5295383d76db5a77d79e8a27f
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains embedded JavaScript and numerous external URIs, with a critical ClamAV detection and a high ML score indicating malicious intent. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' suggests the document is designed to host many links, likely directing users to malicious sites. The embedded JavaScript is likely used to facilitate the redirection or exploit vulnerabilities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9940

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://samuelben-horin.com/userfiles/file/bewali.pdf In PDF document text
    • http://z500.si/files/jozukasobozipodogega.pdfIn PDF document text
    • https://editions-tlp.fr/ckfinder/userfiles/files/sogukatofuj.pdfIn PDF document text
    • https://certifiedcollisionrepair.com/home/cert/public_html/ckfinder/userfiles/files/83942263765.pdfIn PDF document text
    • http://npk-bypassdrr2.com/file_media/file_image/file/morokopoxereno.pdfIn PDF document text
    • http://ceraunavoltapizzeria.it/userfiles/files/piribizisoxuw.pdfIn PDF document text
    • https://trouver-une-ssii.com/img/pics/files/kixenaxixeginirutowe.pdfIn PDF document text
    • http://hengtaixin.com/HangShun/ckfinder/userfiles/files/jadoxinopezogovi.pdfIn PDF document text
    • http://am-assets.com/aom/magnolia/userfiles/file/furogogabejumema.pdfIn PDF document text
    • http://weldingplaza.com/files/file/49916539243.pdfIn PDF document text
    • https://linardi.ru/files/file/60626569880.pdfIn PDF document text
    • http://sgyscom.com/upload_fck/file/2021-9-25/20210925072939365929.pdfIn PDF document text
    • http://turinhotelcompany.com/userfiles/files/xedojuzip.pdfIn PDF document text
    • https://ever-progress.dacola.com/upload/files/vewixazuzelanikuzizofe.pdfIn PDF document text
    • https://isleo.com/i_photos/file/lubifavapawazukazumipa.pdfIn PDF document text
    • https://artasedanasingaraja.com/uploadfck/file/xifelakipi.pdfIn PDF document text
    • http://beverly.kopanramen.com/uploads/files/vejugakawux.pdfIn PDF document text
    • http://dinskayarealty.ru/media/file/lafusuxozomudapureg.pdfIn PDF document text
    • https://cashcruis.ru/wp-content/plugins/super-forms/uploads/php/files/a7fb3e4f5740291b2af2e49dbf9016cc/bojujofesagixapamizu.pdfIn PDF document text
    • http://cauthangdep24h.com/upload/files/zamixoxirefugeruzatoxo.pdfIn PDF document text
    • http://newdimension.su/userfiles/file/gujirexeduza.pdfIn PDF document text
    • https://www.groupe-coelho.fr/ckfinder/userfiles/files/tozoxisamili.pdfIn PDF document text
    • http://studiolauramoschini.it/userfiles/files/lesipovuzixikat.pdfIn PDF document text
    • http://nyitotthaz.hu/userfiles/files/24922449026.pdfIn PDF document text
    • http://garage-fuji.jp/js/upload/files/bigit.pdfIn PDF document text
    • https://olajpark.hu/files/files/59789464200.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=restore+messages+from+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_off0000b8a0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB8A0 10696 bytes
SHA-256: eedbe1405fdccc527416d0061c3340a727fcb5ceaf7a1a5cf0cf52e6080e6113
font_01_sfnt_off0000d0f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD0F3 17384 bytes
SHA-256: 4198e44fc915dfd19a4f62a7b020b62fb0bbe657b3eafbb349bb5facaeb5b72f
font_02_sfnt_off0000fd00.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD00 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1