Malicious PDF — malware analysis report

Static analysis result for SHA-256 b70505bda00dedc3…

MALICIOUS

PDF

91.8 KB Created: 2021-03-29 20:14:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-25
MD5: 76b37e06b2cd30db1a4dbc267ef2520d SHA-1: ea28dd3c56e5857ee717f65c37bbf1e3497d2a9d SHA-256: b70505bda00dedc3c9ef40b10ebbd9fcc9bc9d59708dcb73ff81e5ca78486876
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The sample is a PDF file flagged by ML classifiers and ClamAV as malicious. It contains numerous embedded URLs, many pointing to disposable domains, suggesting a link farm or phishing lure. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic indicates a deliberate attempt to create a large number of links on low-reputation hosting, likely to distribute malware or conduct phishing. No scripts were extracted, but the overall structure and URL patterns are consistent with a malicious document designed to redirect users to harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://pelibifir.ru/award?keyword=all+silent+on+the+western+front+pdf PDF link annotation
    • http://zokiwedilar.mypressonline.com/rixedikisu.pdfIn PDF document text
    • https://cdn.sqhk.co/xenudipu/cfcCmSF/razalean_reviews_youtube.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4416490/normal_5fdd88e3b4ac0.pdfIn PDF document text
    • http://sitebomobegux.sportsontheweb.net/play_cards_against_humanity_online_with_friends_reddit.pdfIn PDF document text
    • https://cdn.sqhk.co/nuzitomizaj/ghWhjtG/hangouts_doesn_t_show_caller_id.pdfIn PDF document text
    • http://zomolejefej.mywebcommunity.org/global_capital_market.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4489422/normal_5fd90575b498c.pdfIn PDF document text
    • http://kozidozilujivox.getenjoyment.net/jisaxa.pdfIn PDF document text
    • http://vubitim.sportsontheweb.net/bebiximoralud.pdfIn PDF document text
    • https://cdn.sqhk.co/jutepoxof/jQ2jefO/30950645785.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/bdf0db5c-b5a4-45a2-93e2-0a71494f4e86/56775046283.pdfIn PDF document text
    • http://vivetusukuv.onlinewebshop.net/budajipizojo.pdfIn PDF document text
    • http://nejimafalun.onlinewebshop.net/guia_holman_de_apologetica_cristiana_gratis.pdfIn PDF document text
    • http://vasakuzepilaxi.onlinewebshop.net/bauhinia_monandra.pdfIn PDF document text
    • http://bemabam.myartsonline.com/accountancy_book_class_11_solutions.pdfIn PDF document text
    • http://kojenixerog.myartsonline.com/echo_flex_user_manual.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e6ea98c4-b330-4148-82c7-b715c1780bef/pabibinewuwijugesagoman.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/02befe5c-1c4d-49cb-9c8b-6cc7d8269fb5/conceptos_de_quimica_organica.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_off00012959.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12959 5000 bytes
SHA-256: 5c52ee4b0c8ad6199451afdaecaa69094df9b5740bfeedb25225c24b6b24c8eb
font_01_sfnt_off00013a66.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13A66 11916 bytes
SHA-256: c596bb481f8933cee229954177081812827a8aa0aa667f397005cc416bc9d760

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