Malicious PDF — malware analysis report

Static analysis result for SHA-256 e26aa3454a866f1a…

MALICIOUS

PDF

73.5 KB Created: 2021-03-10 01:37:26 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: a401adf982750dbccd995c331582c325 SHA-1: e958c7b886e35995030ec5a40191a3b81ace5d4c SHA-256: e26aa3454a866f1a9123c2d3fa59d7053a389dbce9f002a32ce89b3ca0120467
126 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The presence of numerous external URIs, including one pointing to 'bologen.ru', suggests the document is designed to redirect users to potentially harmful websites. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' further supports this, indicating the PDF acts as a link farm on disposable hosting, a common tactic for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

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://bologen.ru/aws?utm_term=lg+tone+infinim+hbs-920+wireless+stereo+headset PDF link annotation
    • https://cdn.sqhk.co/duzupafuj/YsfWkNH/cedar_hill_furniture_huber_heights_ohio.pdfIn PDF document text
    • http://neridipazaf.22web.org/2011_chevy_traverse_problems.pdfIn PDF document text
    • http://kakaxazirobolob.iblogger.org/how_do_i_get_a_tinder_verification_code.pdfIn PDF document text
    • https://cdn.sqhk.co/mekurapiw/dA5nWKh/2017_football_playoff_schedule_channel.pdfIn PDF document text
    • http://bomufofo.iblogger.org/77915227872.pdfIn PDF document text
    • https://pasezoxe.weebly.com/uploads/1/3/5/3/135347718/7643781.pdfIn PDF document text
    • https://cdn.sqhk.co/xubulozirod/OEjb1jg/kiki_s_delivery_service_book_vs_movie.pdfIn PDF document text
    • https://cdn.sqhk.co/dojaxeje/hbhcjgk/gonazujazizunumovokave.pdfIn PDF document text
    • https://foluxodemebomo.weebly.com/uploads/1/3/0/7/130739593/953cf0d79767c14.pdfIn PDF document text
    • https://zetolame.weebly.com/uploads/1/3/0/7/130775520/kokexuwezema.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://golokelu.rf.gd/atletico_madrid_vs_arsenal_match_report.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/93f3f03d-6cc0-4b2a-8d42-a93f7c47b27c/nuwidojumaputusik.pdfIn PDF document text
    • http://buwebone.epizy.com/craftsman_16_gallon_shop_vac_filter_menards.pdfIn PDF document text
    • http://jipudovisubu.rf.gd/answers_to_appraisal_form_questions.pdfIn PDF document text
    • http://vozuxutebesur.rf.gd/73929234864.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/86473995-41ec-4375-a000-ac5791fcf623/30_day_drawing_challenge_october_2020.pdfIn PDF document text
    • http://nivawuxiki.rf.gd/2020_scag_turf_tiger_for_sale.pdfIn PDF document text
    • http://zejunosafob.rf.gd/10095994749.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_off0000db0f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB0F 5956 bytes
SHA-256: 6661195d3af326e5e42acc3741cf3e86744b57afc16520930bbf94a5d84d505d
font_01_sfnt_off0000ef47.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF47 11752 bytes
SHA-256: ce41f09234289d0a338af05202ccc96dc2e157c0bdd50871e1637342d4908017

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