Malicious PDF — malware analysis report

Static analysis result for SHA-256 1a51d6e23f811c36…

MALICIOUS

PDF

90.2 KB Created: 2021-03-02 20:15:10 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-14
MD5: 38cdde62af3613e71df74fec1afb053e SHA-1: 39a51f592ad243199523f491256a3992db7f3854 SHA-256: 1a51d6e23f811c368e8ed6fe45d6881a274e8b1a57a955ec369af65748cff529
174 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link T1059.007 JavaScript

The PDF contains numerous external URIs and is flagged as a link farm on disposable hosting, indicating a phishing or malware distribution attempt. The 'SE_BROWSER_INSTALL_LURE' heuristic strongly suggests the document's content is designed to trick the user into installing a malicious browser extension or update. ClamAV also detected this file as 'Pdf.Phishing.Trojan'. No scripts were extracted, but the presence of multiple malicious URLs and social engineering lures points to a high likelihood of a phishing or downloader attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://leonvi.ru/award?keyword=bushnell+neo+ghost+bag+clip PDF link annotation
    • https://fevuxutub.weebly.com/uploads/1/3/4/1/134131759/nixofumolododa.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4415527/normal_600653c55d6c2.pdfIn PDF document text
    • http://kavelokafozi.medianewsonline.com/dark_souls_3_save_game_editor.pdfIn PDF document text
    • http://nepatokada.mypressonline.com/premier_protein_cafe_latte_caffeine_content.pdfIn PDF document text
    • http://bulakirip.getenjoyment.net/34286603605.pdfIn PDF document text
    • http://gagivukamuw.getenjoyment.net/jalapezuxaranorejeponok.pdfIn PDF document text
    • http://rowomonug.mywebcommunity.org/netogex.pdfIn PDF document text
    • http://nomenowunesazoz.scienceontheweb.net/is_there_a_sequel_to_the_shining_book.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4471273/normal_5fe195fdc9333.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4447447/normal_60014ab0ebe73.pdfIn PDF document text
    • https://cdn.sqhk.co/kewudomavave/jfE0NIl/zikenido.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454813/normal_603af67521ef4.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/gulapore/73584051659.pdfIn PDF document text
    • https://s3.amazonaws.com/najipavez/ejercicios_categorias_gramaticales_3o_eso.pdfIn PDF document text
    • http://rosajeku.myartsonline.com/divine_mercy_novena_2020.pdfIn PDF document text
    • https://s3.amazonaws.com/purufiz/79566428446.pdfIn PDF document text
    • https://s3.amazonaws.com/wupixufekijax/18793993014.pdfIn PDF document text
    • 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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001237a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1237A 5288 bytes
SHA-256: f62db3f3590addd6f10fd8f0372cf1965e0356327e6b4eead64eda4bb91874b8
font_01_sfnt_off0001357b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1357B 11316 bytes
SHA-256: 926484f14b8b99c7459a16ae4cb785e73622cbb961b4a92368059f4341a0ed41

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