Malicious PDF — malware analysis report

Static analysis result for SHA-256 41081d88d7b7272e…

MALICIOUS

PDF

85.2 KB Created: 2021-09-17 14:56:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 13f7b59f81567ec484312a6b01436b9b SHA-1: 179e7772b8c417e3ad8c9e9d9b1580fba37c86bc SHA-256: 41081d88d7b7272eb5a1cba7636cd490a534a802bf9f86afea1ff23a99eb5313
174 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and multiple external links, many pointing to disposable hosting, which is characteristic of phishing or malware distribution. The heuristic 'SE_PASSWORD_ARCHIVE_LURE' indicates the document likely instructs the user to open a password-protected archive, a common tactic to bypass gateway security. The ML classifier strongly flagged this PDF as malicious.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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://plagij.at/ckfinder/userfiles/files/24291493077.pdf In PDF document text
    • http://autoscuolecasetta.it/userfiles/files/galugasisamuwe.pdfIn PDF document text
    • https://lifesmart.ro/ckfinder/userfiles/files/wobekonaruxavijopoligar.pdfIn PDF document text
    • https://www.sharpeningfactory.com/wp-content/plugins/formcraft/file-upload/server/content/files/16144577b1af86---64184163095.pdfIn PDF document text
    • http://scuderia512.com/js/upload/files/fejuzarewivumugirasa.pdfIn PDF document text
    • http://konferencii.org/web/uploads/assets/file/59634415949.pdfIn PDF document text
    • https://congthuonghotel.vn/app/webroot/files/images/pages/files/75310418920.pdfIn PDF document text
    • http://madinaboys.com/easydo%20v2.00/files/uploads/rovabad.pdfIn PDF document text
    • https://rrr71.ru/upload_picture/jalebe.pdfIn PDF document text
    • https://blnk.eu/userfiles/files/79882742155.pdfIn PDF document text
    • http://ktcz.eu/files/files/66086125741.pdfIn PDF document text
    • http://le-nora.com/userfiles/file/69257566522.pdfIn PDF document text
    • http://scea.edu.mn/ckfinder/userfiles/files/nijuwafasubepazogavolo.pdfIn PDF document text
    • http://baharemadinah.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139f48ee2a6e---zivul.pdfIn PDF document text
    • http://tccsrl.org/userfiles/files/9730143232.pdfIn PDF document text
    • http://metabolitplus.ru/files/file/lojejelesivebokewudaxapo.pdfIn PDF document text
    • http://www.videobezopasnost.ru/ckfinder/userfiles/files/giwezujelipimijob.pdfIn PDF document text
    • https://incense888.com/uploads/files/202109120555569757.pdfIn PDF document text
    • http://groupkaishan.com/d/files/tinupa.pdfIn PDF document text
    • https://s-oil.hoakhanh.vn/uploads/image/files/gozosironetemibuxiniv.pdfIn PDF document text
    • https://badoza.net/userfiles/file/bekudutut.pdfIn PDF document text
    • http://khamtribacninh.com/images/files/60942673601.pdfIn PDF document text
    • https://galedo.cz/www/data/cms_files/files/94994238843.pdfIn PDF document text
    • https://flardochform.se/userfiles/file/611204627.pdfIn PDF document text
    • http://seoulsquare.com/userfiles/file/93019113381.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=fifa+2015+apk+obbPDF 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_off0000e679.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE679 10340 bytes
SHA-256: 7a307356e6577ec9d08442d629d82d068a4cd98410cf809d0ffe9954843741a4
font_01_sfnt_off0000fdc1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDC1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000115d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x115D3 19080 bytes
SHA-256: 2d637b6b552257dd7015c75614c69dd1e1953e0ab71cf67ccf29780ae8b2ca67