Malicious PDF — malware analysis report

Static analysis result for SHA-256 cdb333d00b89ddac…

MALICIOUS

PDF

81.7 KB Created: 2021-04-03 17:19:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-25
MD5: 58e98bed8ad63e1814162c71d0eb4f86 SHA-1: abcb60092051b44d9af7a01f022ebebb33e35699 SHA-256: cdb333d00b89ddacd9e6a7d8bf2ab84a1f22dc6d0c48cd6e4de70beb9bcd16c9
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to disposable domains, and is flagged by ML classifiers and ClamAV as malicious. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a high volume of links designed to manipulate search engine results or redirect users to malicious content. The presence of external URIs and the overall structure suggest a phishing or redirection attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://mezovuduw.ru/strik?utm_term=diccionario+de+dudas+rae+pdf PDF link annotation
    • https://cdn.sqhk.co/vusabutam/cmaFhd0/releke.pdfIn PDF document text
    • https://cdn.sqhk.co/virapazetif/AQhiDhi/gluten_free_banana_monkey_bars.pdfIn PDF document text
    • http://storeeuro.info/2005_nissan_pathfinder_transmission_oil_coolerb6h79.pdfIn PDF document text
    • http://juxowupekabaf.mygamesonline.org/blood_group_types_list.pdfIn PDF document text
    • https://nimudizovif.weebly.com/uploads/1/3/4/4/134478886/vurovutavuz_davemifijutawus.pdfIn PDF document text
    • http://whitecheat.xyz/snt-_tc-_1a_2011_editionf680w.pdfIn PDF document text
    • http://power-guard.shop/2966284305987u44.pdfIn PDF document text
    • https://cdn.sqhk.co/pigexebobe/hYgcgd9/download_game_my_city_pajama_party_mod_apk.pdfIn PDF document text
    • http://uablog.website/criminal_law_examples_ukucnah.pdfIn PDF document text
    • http://itverys.space/712812716663r88u.pdfIn PDF document text
    • http://ersoil.fun/how_do_i_set_my_canon_printer_to_scan_to_my_computer0rsnt.pdfIn PDF document text
    • http://lnstagramcopyrightservices.org/xafomijipopekagulodasalgvxob.pdfIn PDF document text
    • https://cdn.sqhk.co/munemuzabuk/bTGhgji/business_ideas_to_start_in_kenya_2020.pdfIn PDF document text
    • http://duplicwcnj.space/25578091702mc32a.pdfIn PDF document text
    • https://gilurumujeluzem.weebly.com/uploads/1/3/1/8/131857598/107e2.pdfIn PDF document text
    • https://bafovulik.weebly.com/uploads/1/3/1/0/131070506/zokula.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://wukevivetarapu.myartsonline.com/koviri.pdfIn PDF document text
    • https://ec679cc6-872a-45a8-b2fd-b1bc8f6ddb77.filesusr.com/ugd/d1d005_c2b14d548d0740c78ad60ca69bc04d9c.pdf?index=trueIn PDF document text
    • http://bufijonewufo.onlinewebshop.net/what_is_an_objective_theory_of_welfare.pdfIn PDF document text
    • https://d70b1dc8-7d09-4148-9854-e6a7cae1b87b.filesusr.com/ugd/5899d5_7ee9204e3fb240cea00ff4b515cf4052.pdf?index=trueIn PDF document text
    • https://8964868a-aef6-4da0-9a9b-29de7c28e0c5.filesusr.com/ugd/b910ae_36e217a673944759a19a6b67f71bac8f.pdf?index=trueIn PDF document text
    • https://72dfff08-f6cb-4f5d-aaac-ebe71175d6a6.filesusr.com/ugd/c268f7_46bb0ebd49ba4a03aea0a5da19d1a4f3.pdf?index=trueIn PDF document text
    • https://081e7fb2-604d-424b-9b75-a58d54a71a44.filesusr.com/ugd/abd6ea_d8fa7243ec5f49b7acda11a86ad279e1.pdf?index=trueIn 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_off00010047.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10047 5116 bytes
SHA-256: 684ecb767d1c664cc9c38efd22f18d8c95cc043cea1282ff872c3fd62c37756d
font_01_sfnt_off000111c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x111C5 11680 bytes
SHA-256: 3b291cba70149d7ab465b3353fb6da37b3266804e25ed451384f128d3575247f

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