Malicious PDF — malware analysis report

Static analysis result for SHA-256 336f7cc7eeda8aba…

MALICIOUS

PDF

69.7 KB Created: 2021-01-06 04:50:40 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: a09f6a9a081547c7dae7012ae4496f10 SHA-1: e4dfde8ddee28ee4e914d734abff5208369ddeed SHA-256: 336f7cc7eeda8aba001d4808c0f69edbc8374e2a29e9107edaa080ab96f5b646
184 Risk Score

Malware Insights

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

The PDF contains a link to a known malicious redirector, indicating a phishing or malware distribution attempt. The document body text, though garbled, suggests a lure related to "Razones de cambio ejercicios resueltos pdf", likely to trick users into clicking the malicious link. No scripts were extracted, but the presence of a malicious redirector and the ML classifier's high confidence point to a malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://cctraff.ru/123?utm_term=razones+de+cambio+ejercicios+resueltos+pdf In PDF document text
    • https://xoregofejaba.weebly.com/uploads/1/3/4/6/134651656/salumajisejox_tadazo_fuwom.pdfIn PDF document text
    • https://kenometiwu.weebly.com/uploads/1/3/4/3/134340836/703716.pdfIn PDF document text
    • https://xuzutewoduka.weebly.com/uploads/1/3/4/3/134364923/d527783.pdfIn PDF document text
    • https://cdn.sqhk.co/gusoguribus/2jDjb1h/steam_download_chromebook.pdfIn PDF document text
    • https://bumufufumobumag.weebly.com/uploads/1/3/2/8/132815806/gedowe-digole-kodoxanijaruxuj.pdfIn PDF document text
    • https://cdn.sqhk.co/ruxuvedije/ge3heKH/46075331176.pdfIn PDF document text
    • https://kufidadifijerid.weebly.com/uploads/1/3/1/4/131407945/gemawos.pdfIn PDF document text
    • https://bativizamazon.weebly.com/uploads/1/3/4/7/134770744/xafiwigum_vifakug_fajetibakev.pdfIn PDF document text
    • https://cdn.sqhk.co/pajerelo/gc5KOaa/word_chef_game_online.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/wozoxub/islamic_amliyat_books_free.pdfIn PDF document text
    • https://s3.amazonaws.com/gadumagabusodel/types_of_economic_systems_worksheet_answers.pdfIn PDF document text
    • https://s3.amazonaws.com/wanasuvedigo/wekisurebutupabed.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_off0000cfde.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCFDE 5576 bytes
SHA-256: 78ca03ba1e1dd8b9ac3a38b393c9f684e5fc9de4a447a33feaaf616fa5819939
font_01_sfnt_off0000e2c6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2C6 11312 bytes
SHA-256: 9a1ed9ca58315db82cdcc76697ff9d468745f1641bdb33b978628783416b3eed

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