Malicious PDF — malware analysis report

Static analysis result for SHA-256 8e7df6e4643cef0e…

MALICIOUS

PDF

67.2 KB Created: 2021-09-13 17:55:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: b6af0e1bee202fc6b1eef65538dedcaf SHA-1: 3d27cd71e09f135fb95891da83657bd4c5193ef5 SHA-256: 8e7df6e4643cef0ea1cc7b78aef53add8b9482759d043b2ab86cbc57cc93fe52
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by multiple heuristics, including a high-confidence ML classifier and ClamAV, indicating malicious intent. The presence of numerous embedded URLs, many pointing to potentially disposable domains, suggests a link farm designed to redirect users to malicious sites. While no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with phishing or malware distribution campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://jumpstart.mobi/userfiles/file/xobafosuza.pdf In PDF document text
    • http://www.evisiontiendaonline.com/ckfinder/userfiles/files/tosunavukegupevanatodoga.pdfIn PDF document text
    • http://pujcovnanaradi-tvarozna.cz/userfiles/files/11058237067.pdfIn PDF document text
    • https://www.xcelsus.de/wp-content/plugins/formcraft/file-upload/server/content/files/161353e719cced---rexipapedofulazebinir.pdfIn PDF document text
    • https://tp-pos.com/uploads/image/files/23408551640.pdfIn PDF document text
    • http://skoleniridicu-online.eu/ckfinder/userfiles/files/fezezirosom.pdfIn PDF document text
    • https://astdubai.co/userfiles/files/gavadoxabajururunuwe.pdfIn PDF document text
    • http://7m-shop.com/userfiles/file/81321385075.pdfIn PDF document text
    • http://interroadholland.nl/userfiles/file/vozubejiwononeximimuv.pdfIn PDF document text
    • https://hunde-katzen.at/soubory/teduzegegupu.pdfIn PDF document text
    • https://multimetrics.com/ckfinder/userfiles/files/xerijuzegevete.pdfIn PDF document text
    • http://gsxr.hu/userfiles/file/62555081878.pdfIn PDF document text
    • http://kadh.kr/bobod/upload/file/situsogixo.pdfIn PDF document text
    • https://yarsan.ru/wp-content/plugins/super-forms/uploads/php/files/1f42f21df2e4fe6b54736c6d8ae54376/39716694988.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=vivo+cut+apkPDF 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_off0000abc7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xABC7 15260 bytes
SHA-256: 11ac1b1c896e8477b43d8195df343332594cca531b2b534f87310848b02c6d52
font_01_sfnt_off0000d1d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD1D8 10044 bytes
SHA-256: 6e17a970ba65572bf04cce8bce4caaa14ad9ee8f7951a76a7f079878d14cb57a
font_02_sfnt_off0000e862.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE862 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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