Malicious PDF — malware analysis report

Static analysis result for SHA-256 98750c4d4a06c889…

MALICIOUS

PDF

109.9 KB Created: 2021-03-31 15:52:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-10
MD5: 41e4c0d1f85a8da0f8ab5a89df533686 SHA-1: 30d29322e3453906cd31ad13fd2ad1f25857e8ab SHA-256: 98750c4d4a06c889e4a807a39f78843eca29566431155e13614e86ddd0fede77
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 numerous embedded URLs, many of which point to disposable domains and are likely used to redirect users to malicious sites. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a pattern of using numerous links on low-reputation domains, suggesting an attempt to obscure the final malicious destination.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://golowaki.ru/123?utm_term=civ+vi+achievements+guide PDF link annotation
    • http://kurudapod.medianewsonline.com/islamic_calendar_2020_saudi_arabia.pdfIn PDF document text
    • http://onlinesos.tech/faction_base_minecraftf6ois.pdfIn PDF document text
    • http://lemakomude.sportsontheweb.net/bcps_calendar.pdfIn PDF document text
    • http://tinubawolu.mywebcommunity.org/jotifatokokenideb.pdfIn PDF document text
    • http://stickerrus.ru/best_stock_books_for_beginners_2020_redditdida4.pdfIn PDF document text
    • http://leporabev.mywebcommunity.org/salinger_attrape_coeur.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413696/normal_6054b53b19d5a.pdfIn PDF document text
    • https://cdn.sqhk.co/dojopaxitovi/sjciijg/musicas_internacionais_anos_70_80_90_e_2000.pdfIn PDF document text
    • https://cdn.sqhk.co/gujowaxexag/jahfja7/hocus_pocus_costumes_amazon.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4462732/normal_60515dccc14d9.pdfIn PDF document text
    • http://gedatidigog.sportsontheweb.net/rozujizigapigarugerulipo.pdfIn PDF document text
    • https://cdn.sqhk.co/lilaxikixo/c60t1nU/las_vegas_slot_machines_youtube.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4458833/normal_60257f68e14ef.pdfIn PDF document text
    • https://cdn.sqhk.co/sizozizaj/9iigiaC/leap_day_movie_soundtrack.pdfIn PDF document text
    • http://free-at.pro/how_to_fill_in_missing_numbers_in_fractionscycwr.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/9171e696-d086-4c9a-aecd-49d594296072/jalejenixovamabosixemir.pdfIn PDF document text
    • https://s3.amazonaws.com/fajixe/wolf_toaster_ovens_for_sale.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/18fa29a8-9fef-4dc3-8703-35db1f7fefb4/54061599217.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f4393f97-5b15-4217-8249-a3bed8a49f4b/pivegoti.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5d28f5b2-3c3d-45d5-a987-022ac14cfc55/wovez.pdfIn PDF document text
    • https://s3.amazonaws.com/guxosa/distributive_property_of_multiplication_worksheets_5th_grade.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1a61b5ef-0863-4ca1-8af1-cc07794faecf/tidoxubene.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_off00016fdf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16FDF 5188 bytes
SHA-256: 4c6da625048fac3b63ab76ddaf28e54fc668534f3b098a7dd3adedad260128eb
font_01_sfnt_off00018162.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18162 13496 bytes
SHA-256: 1d2f4988256ed50d35df59476038203ec58a226fd56b3aa7b589b86c135fe51a

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