Malicious PDF — malware analysis report

Static analysis result for SHA-256 06f65ce0b023152d…

MALICIOUS

PDF

84.1 KB Created: 2021-09-10 16:51:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 08651b9d46cde23935fe1801a5b054cf SHA-1: 80d30fdb662ebde4de128626665883b1d5d1aca9 SHA-256: 06f65ce0b023152d4b86b3475f0e8cd871b54803607c7862901c6f6124a5a149
206 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF document exhibits characteristics of a phishing lure, specifically employing a password-protected archive pretext to encourage user interaction. It also contains numerous links to external PDF files, suggesting a link farm or redirection mechanism. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to malware distribution or credential harvesting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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
  • Browser extension / update installation lure high SE_BROWSER_INSTALL_LURE
    Document tells the user to install a browser extension, plugin, viewer, or browser update to view content — a common social-engineering path for credential theft and malware installation
  • 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.
  • 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://actaviaserica.org/board/file/files/42073175069.pdf In PDF document text
    • http://giprozdraw.ru/ckfinder/userfiles/files/64657127948.pdfIn PDF document text
    • http://casms.org/atts/news-files/file/35180706805.pdfIn PDF document text
    • https://gregoryshow.ru/files/file/23443747088.pdfIn PDF document text
    • https://k-barrierfree.com/FileData/ckfinder/files/20210908_0F5A397EB4BA6E47.pdfIn PDF document text
    • http://www.nisbd.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a86144db07---vonikitinixazarerafizeme.pdfIn PDF document text
    • https://dgssu.com/upfolder/e/files/20210906180502.pdfIn PDF document text
    • https://monographie.com/ckfinder/userfiles/files/70002288411.pdfIn PDF document text
    • http://www.stallionreadymix.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/161315ae4f1939---23102252247.pdfIn PDF document text
    • http://letsfinal.com/userfiles/file/10966735973.pdfIn PDF document text
    • https://osakaav.com/userfiles/files/didonowerenakexelatin.pdfIn PDF document text
    • http://putzlappenborner.at/editor_up/69157002446.pdfIn PDF document text
    • http://herfon-machinery.com/images/ckfinder/files/20210910123241.pdfIn PDF document text
    • https://venus-forever.com/image/files/xofewibafupoperomuzavuba.pdfIn PDF document text
    • http://italianopizzeria-pg.com/uploads/files/jaxijaturewemogas.pdfIn PDF document text
    • https://gabconstruction.com/ckfinder/userfiles/files/39392229120.pdfIn PDF document text
    • http://realtor-madrid.com/uploades/fckeditorfile/wuparakijojeruxuxutadiz.pdfIn PDF document text
    • https://weyergans-hcc.lv/userfiles/file/377985463.pdfIn PDF document text
    • https://burlingame.com/wysiwygfiles/file/dukanamuvisirade.pdfIn PDF document text
    • https://www.ijestr.com/ckfinder/userfiles/files/24022612032.pdfIn PDF document text
    • https://breedlife.com/upload/files/27641538865.pdfIn PDF document text
    • https://retrofitoman.com/ckfinder/userfiles/files/sitisisavobenuboxagorose.pdfIn PDF document text
    • http://wiskind.com/filespath/files/20210904073845.pdfIn PDF document text
    • http://hasyo.net/files/file/kiditobeguxe.pdfIn PDF document text
    • http://acevina.com/webroot/img/files/gopopipabelupa.pdfIn PDF document text
    • https://usgcambodia.com/userfiles/file/58700863207.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=watch+hbo+firestickPDF 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_off0000e41d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE41D 17728 bytes
SHA-256: f9b27517ae47005272b8c09b166014d39a99a1873c4c86fbe83cd62f2456f3e5
font_01_sfnt_off00011258.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11258 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012a6f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A6F 10508 bytes
SHA-256: e22739f7d389c738c3d966bf2d16e8e7ba354e81b8b6da950a1c029279be4429

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