Malicious PDF — malware analysis report

Static analysis result for SHA-256 38ef6946ff0a7403…

MALICIOUS

PDF

67.8 KB Created: 2021-10-03 18:24:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: d979b8f8626dbc4de775ab028c2205d4 SHA-1: 556450717164991aa597f647c40bc96150031da5 SHA-256: 38ef6946ff0a7403e754d531ef6f1d17d29feb17289c55ece958185d9cc4bb13
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains embedded JavaScript and numerous external URIs, many of which are hosted on potentially disposable domains, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. The embedded JavaScript is likely used to facilitate the redirection or exploit vulnerabilities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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://maychieuvinh.vn/upload/files/3475632956.pdf In PDF document text
    • http://k3projekt.pl/uploads/userfiles/files/bubawizedirin.pdfIn PDF document text
    • http://actionelectric.pt/www/wp-content/plugins/formcraft/file-upload/server/content/files/16135fb9ec685d---jutizuvudugox.pdfIn PDF document text
    • http://degeninhotel.ru/admin/ckfinder/userfiles/files/29650835153.pdfIn PDF document text
    • https://evergreencans.com/userfiles/file/lalanuwakorok.pdfIn PDF document text
    • https://marblobath.com/app/webroot/img/files/gabuzi.pdfIn PDF document text
    • https://djennebeads.com/nbloom/fckuploads/file/83800972167.pdfIn PDF document text
    • https://hefcom-hydraulics.com/ckfinder/userfiles/files/sawozamomesipemikozezi.pdfIn PDF document text
    • http://kpdb.org/userfiles/files/87466484471.pdfIn PDF document text
    • https://clubberia.com/js/ckfinder/userfiles/files/85256257159.pdfIn PDF document text
    • http://www.sunarpazarlama.com/wp-content/plugins/super-forms/uploads/php/files/3pjafq60p0co4qnp89cu42ivc7/7371302418.pdfIn PDF document text
    • http://www.rupankar.com/fckimages/file/86892136982.pdfIn PDF document text
    • http://byty-pardubice.eu/UserFiles/File/35831839743.pdfIn PDF document text
    • http://gusanhightec.com/userData/board/file/bunidevebowiwijifonoruje.pdfIn PDF document text
    • https://csn-alliance.com/data/files/11667225489.pdfIn PDF document text
    • http://cheumst.com/upload/fckeditor/file/dixabu.pdfIn PDF document text
    • http://3e3i.com/UserFiles/file///66770130548.pdfIn PDF document text
    • https://sintasyapi.com/img/userfiles/file/97788499601.pdfIn PDF document text
    • http://firegallery.ru/img/upload/40143543024.pdfIn PDF document text
    • http://eko-uklid.com/files/file/natol.pdfIn PDF document text
    • http://fabriquetextil.com/js/new/fckeditor/userfiles/file/dibotopeferepixu.pdfIn PDF document text
    • http://xn--90aoa5aj.xn--p1ai/ckfinder/userfiles/files/26968834268.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=chair+in+englishPDF 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_off0000af1b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAF1B 14504 bytes
SHA-256: 0c1e447bc61c516d19f63f805784c57ec96f3b7267d54f48729f9ddb53fd0b0f
font_01_sfnt_off0000d326.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD326 10200 bytes
SHA-256: bf94d0aca14e211508653b9bc1ffaea590a5599d51bbe5435755d3d1412391c7
font_02_sfnt_off0000e9e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9E2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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