Malicious PDF — malware analysis report

Static analysis result for SHA-256 8be469a09bf9fb6a…

MALICIOUS

PDF

72.4 KB Created: 2021-09-30 17:38:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 399c1aa5cd3ea9afa9b1d1508a5c7a52 SHA-1: 8468efd154fe426f723b9e12497b6dcdcfa98ab9 SHA-256: 8be469a09bf9fb6ad06fac661f17939e8de4e1a517d68c4e11059a1366655e49
126 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious. It contains numerous embedded URLs, many of which point to potentially disposable domains, indicating a link farm designed to redirect users. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly suggests a phishing or malware distribution attempt. No scripts were extracted, but the structure and embedded URLs are indicative of malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 5

  • 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.
  • 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://xn----ctbguteehkho5h.xn--p1ai/ckfinder/userfiles/files/70124803084.pdf In PDF document text
    • https://sin-wa.tw/app/webroot/userfiles/files/5611889397.pdfIn PDF document text
    • https://www.ccs-corporation.com/ckfinder/userfiles/files/64799129315.pdfIn PDF document text
    • http://files.ibiza-ferien.de/file/50681061778.pdfIn PDF document text
    • http://tobolsk.fluentrussia.ru/img/content/files/bafoxipabipala.pdfIn PDF document text
    • http://feuerwehr-mittenwalde.de/mediathek/files/satazon.pdfIn PDF document text
    • https://qeyeoptical.com/ckeditor/ckfinder/userfiles/files/20066386003.pdfIn PDF document text
    • http://giadinhmedia.com/uploads/files/91690552955.pdfIn PDF document text
    • http://betonkeritesek.eu/Content/files/beritememiletozakorot.pdfIn PDF document text
    • http://www.sunarmisir.com.tr/wp-content/plugins/super-forms/uploads/php/files/c64ijkd32o0bms7co8q9aionq1/67698825242.pdfIn PDF document text
    • http://npi-management.fr/ressource/site-image/files/fofase.pdfIn PDF document text
    • https://regiefranchet.fr/userfiles/files/93741079188.pdfIn PDF document text
    • https://ceiling.holcom.vn/webroot/img/files/14862589333.pdfIn PDF document text
    • https://iwistw.com/upload/files/74705044542.pdfIn PDF document text
    • https://creativenursery.net/home/creative/public_html/ckfinder/userfiles/files/bedamejowot.pdfIn PDF document text
    • https://directprocessors.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614e6cf47daf0---16681852073.pdfIn PDF document text
    • http://suurelepa.ee/data/file/sufubusake.pdfIn PDF document text
    • http://russia-ex.com/images/blog/file/bazuzatilivulipulikep.pdfIn PDF document text
    • http://kartinatv.org/uploads/files/82456717709.pdfIn PDF document text
    • http://good163.cn/Uploadfiles/files/loxanajapotelevasefibuf.pdfIn PDF document text
    • http://fli.edu.mn/ckfinder/userfiles/files/nudasojaxonujet.pdfIn PDF document text
    • http://uniquehotelsolutions.com/files/others/57631520590.pdfIn PDF document text
    • http://www.tokyomagic.jp/images/library/File/10657179188.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=on+her+majesty%27s+secret+service+putlockerPDF 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_off0000b2e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB2E0 17316 bytes
SHA-256: 085eaebb6724610a8c083f77d057dcfcc54cab71007cf1d56222adae1b4cc0ce
font_01_sfnt_off0000df70.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF70 11200 bytes
SHA-256: 3972b4b9d7c808b05d06a72945661278d36903cb5c3cd13eeddea9eb4e607700
font_02_sfnt_off0000f999.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF999 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1