Malicious PDF — malware analysis report

Static analysis result for SHA-256 77bceb4d39b9dab6…

MALICIOUS

PDF

76.0 KB Created: 2021-03-10 16:02:56 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-30
MD5: ce22d3dc10c003a2a4fcd687d543a18a SHA-1: 59533049311b1398e99601ec642a70b641753ada SHA-256: 77bceb4d39b9dab6636a77cadb7694c8e0cccedb6951b9b39fcd85a9376e3350
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, specifically as a phishing trojan. It contains a large number of embedded URLs, many pointing to disposable hosting, suggesting a link farm or phishing campaign. The document body, though heavily obfuscated, contains references to 'wkhtmltopdf' and a date, indicating it was likely generated programmatically to host these malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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 https://midufefew.ru/123?utm_term=sleeping+beauty+2014+parents+guide PDF link annotation
    • http://gagimubu.mywebcommunity.org/lawn_boy_customer_service_phone_number.pdfIn PDF document text
    • http://pogibofabut.getenjoyment.net/que_es_educacion_a_distancia_segun_autores.pdfIn PDF document text
    • https://gemuvubakada.weebly.com/uploads/1/3/4/4/134494784/dokemaxe.pdfIn PDF document text
    • http://sewamagiz.66ghz.com/message_apk_pro.pdfIn PDF document text
    • https://zexaloguf.weebly.com/uploads/1/3/4/5/134576330/6076377.pdfIn PDF document text
    • http://gibelineg.sportsontheweb.net/97504241067.pdfIn PDF document text
    • https://rovonowevon.weebly.com/uploads/1/3/6/0/136051941/6529006.pdfIn PDF document text
    • http://soluzixod.66ghz.com/94336493923.pdfIn PDF document text
    • http://pifemukopisare.sportsontheweb.net/que_sintomas_hay_cuando_tienes_infeccion_en_las_vias_urinarias.pdfIn PDF document text
    • http://jidapuxedepu.medianewsonline.com/japanese_mythology_books_barnes_and_noble.pdfIn PDF document text
    • https://zivibesojosilit.weebly.com/uploads/1/3/5/3/135304262/xivev.pdfIn PDF document text
    • https://rorujazikuje.weebly.com/uploads/1/3/1/3/131379225/loxibiruvabus.pdfIn PDF document text
    • http://gizaripe.iblogger.org/81963653429.pdfIn PDF document text
    • http://xedijama.getenjoyment.net/bavalofebukabogavike.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://pisasegabuxakup.epizy.com/game_of_thrones_season_3_in_hindi_free_download_filmyzilla.pdfIn PDF document text
    • https://s3.amazonaws.com/geradi/companies_house_beta.pdfIn PDF document text
    • http://gurabagoderes.atwebpages.com/lubiliji.pdfIn PDF document text
    • https://s3.amazonaws.com/xelimewat/84435201800.pdfIn PDF document text
    • https://s3.amazonaws.com/juzowilipi/bufodafexikuwubes.pdfIn PDF document text
    • http://fosekor.epizy.com/45002379798.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_off0000ebcc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBCC 5884 bytes
SHA-256: 6a737c256a3b3c2c6b2cdba61a18c34c6f5c8441dd711327fa6e0124b8ee09c1
font_01_sfnt_off0000ffe4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFE4 10212 bytes
SHA-256: 156bb201241b7c8fe993c074fc9c32ca685b6290c39437038934962f890009c1

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