Malicious PDF — malware analysis report

Static analysis result for SHA-256 bb1c236639bbb60e…

MALICIOUS

PDF

76.6 KB Created: 2021-03-01 00:53:32 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: 7ad33a86f1e6c44a825267940c29a5ff SHA-1: 83f5176c9b7e1030c4d659f3790d76fad95d2790 SHA-256: bb1c236639bbb60e330beb359bcf3f6ae70b472825ce9b4da6d2c3dcfa083f5c
126 Risk Score

Malware Insights

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

The PDF contains an embedded URI pointing to a suspicious domain, identified by heuristics as a link farm on disposable hosting. ClamAV detection and ML classification strongly indicate malicious intent, specifically phishing. Although no scripts were explicitly extracted, the PDF structure and embedded URI suggest it's designed to redirect users to a malicious site, likely for credential harvesting or further malware delivery.

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
  • 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://gimoguvi.ru/123?utm_term=women%2527s+new+roles+in+the+1920s PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4481834/normal_5ff9a8bec437b.pdfIn PDF document text
    • http://kedepoba.sportsontheweb.net/sistema_endocrino_en_ingles_para_nios_eduteca.pdfIn PDF document text
    • http://rexuwoxaga.sportsontheweb.net/tagavesudexika.pdfIn PDF document text
    • http://dovulup.iblogger.org/4511544801.pdfIn PDF document text
    • http://jetolad.iblogger.org/crayon_shin_chan_movie_2018.pdfIn PDF document text
    • http://woxijakuzadajew.getenjoyment.net/60514168837.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4503584/normal_5fe19d3737fc9.pdfIn PDF document text
    • http://wijasagasipode.getenjoyment.net/glacier_bay_water_cooler_dripping.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://kegonen.rf.gd/18245937120.pdfIn PDF document text
    • http://wadoromutisagar.myartsonline.com/91169824387.pdfIn PDF document text
    • http://bikutuvuxaxixo.epizy.com/zuvigibaguvejot.pdfIn PDF document text
    • http://dekutob.epizy.com/gmat_official_guide_2019_google_drive.pdfIn PDF document text
    • http://zefixufedinokas.epizy.com/abobora_paulista_informao_nutricional.pdfIn PDF document text
    • http://luvabokinoleg.onlinewebshop.net/wosusolekilupofob.pdfIn PDF document text
    • http://zaxilofekuji.epizy.com/40604999048.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_off0000ec8f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC8F 5336 bytes
SHA-256: 73fdcc5ce60478a7d1ea9e952ecae1ad3754f4c96b50c69476c848e3229ca081
font_01_sfnt_off0000feaa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEAA 11436 bytes
SHA-256: bb1c2aa7260e0f404d3b0db713a6366a48255b4583c25ee98e82c14d31fcfc13

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