Malicious PDF — malware analysis report

Static analysis result for SHA-256 9a67aaddb82960ac…

MALICIOUS

PDF

69.8 KB Created: 2021-10-01 02:51:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: b70fc102f39e9531890bb6e50d3f9c6d SHA-1: 123a61e83f5a997e4793cd8c6f3cfeb8e52e9910 SHA-256: 9a67aaddb82960ac52aea1d377eb575f1888c372fbb84eaf61e6df34be478537
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which are hosted on disposable domains and appear to be part of a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The embedded JavaScript is a common technique for initiating malicious actions within PDFs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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://krindustria.com.br/site/wp-content/plugins/formcraft/file-upload/server/content/files/161488455d49c1---nunomimirufapotudal.pdf In PDF document text
    • https://alubiasdetolosa.com/files/galeria/files/pexojinufekidakadi.pdfIn PDF document text
    • http://www.klimavill.com/data/editorfile/taralejilako.pdfIn PDF document text
    • http://getvisa.ru/images/File/wezitiduwojakeduve.pdfIn PDF document text
    • https://astdubai.co/userfiles/files/887423170.pdfIn PDF document text
    • http://krcatikyonetimi.com/userfiles/file/6734418423.pdfIn PDF document text
    • http://nebovsem.ru/app/webroot/files/files/20698695344.pdfIn PDF document text
    • https://specialgarden.ro/userfiles/file/99941847437.pdfIn PDF document text
    • https://www.indee-r.fr/wp-content/plugins/super-forms/uploads/php/files/ed5faefbab1252fd6a9f2855b2c2ec89/88068561007.pdfIn PDF document text
    • https://kermanrooz.com/img/files/musoxegadarew.pdfIn PDF document text
    • http://krindustria.com.br/site/wp-content/plugins/formcraft/file-upload/server/content/files/1615258707fe67---85929385262.pdfIn PDF document text
    • https://www.tratedu.net/ssss2018/assets/143ad273/ckfinder/core/connector/php/upload/userfiles/files/f9d4b724fca8d0ccee3eb1a967f4e056.pdfIn PDF document text
    • https://www.luthier-auxerre.fr/ckfinder/userfiles/files/77760127385.pdfIn PDF document text
    • http://intproplaw.com/admin/uploads/file/87682640354.pdfIn PDF document text
    • https://xcheck.vn/uploads/userfiles/file/72573569913.pdfIn PDF document text
    • http://cafesezony.ru/fck_editor_files/files/51735424551.pdfIn PDF document text
    • https://www.igescanada.com/ckfinder/userfiles/files/vesojaxakuxeru.pdfIn PDF document text
    • https://vinocastillo.hu/editor_up/52072609798.pdfIn PDF document text
    • https://skl68n15g-n2ox.com/contents/files/kevigepetobenolatob.pdfIn PDF document text
    • http://nagakuratrading.com/js/upload/files/muxapamovowe.pdfIn PDF document text
    • https://watertorens.nl/userfiles/file/futubor.pdfIn PDF document text
    • http://slbreakingnews.com/ckfinder/userfiles/files/fejoxapaxate.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=how+to+record+screen+with+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_off0000b1bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB1BC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c9d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC9D3 10496 bytes
SHA-256: e5e6e1591da003f057d95039e94e8821303b97dff0875efb6f726c87cb1ae5c2
font_02_sfnt_off0000e1a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1A1 15740 bytes
SHA-256: 3835fd5a72146600840746b505c50c42b4db09641b53f25881c75a25603a5aef

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