Malicious PDF — malware analysis report

Static analysis result for SHA-256 9283f7f5bbc06897…

MALICIOUS

PDF

87.4 KB Created: 2021-03-30 09:50:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 0d69b998c4527eac1de7f382c059a2c9 SHA-1: 9b822e0f82350d8627a1e7cf78f5d1353ec342d3 SHA-256: 9283f7f5bbc0689710183fc1f86a184bd1fe66b8e27a23913d061eef81456913
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

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://mezovuduw.ru/award?keyword=oxford+bookworms+pdf+stage+4 PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4490746/normal_602f443d09519.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4376612/normal_5fcaf734e98a2.pdfIn PDF document text
    • http://vixabaj.scienceontheweb.net/82939234572.pdfIn PDF document text
    • http://moxupasasitote.mywebcommunity.org/90001795824.pdfIn PDF document text
    • http://gokawojop.scienceontheweb.net/delhi_metro_map_2020_free_download.pdfIn PDF document text
    • http://rovanenafet.getenjoyment.net/the_10-day_detox_diet_autoimmune_solution.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4369158/normal_5ff4c0bf913a4.pdfIn PDF document text
    • http://nakotigolajeg.scienceontheweb.net/data_mining_companies_stock.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://lopakesuzuw.atwebpages.com/17830583610.pdfIn PDF document text
    • https://s3.amazonaws.com/kasuwevovog/zisibukalub.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/be081e07-e374-4a2b-8f6b-6e1a7e02a757/finding_main_idea_and_supporting_details_exercises.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9dc526a3-3a17-4b61-a730-b75e4bc63761/what_are_the_different_genres_of_films.pdfIn PDF document text
    • https://s3.amazonaws.com/rurovikejigibu/bidafesixofizuzisok.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3d067b98-785e-40cb-90c2-d4b79b29f0b0/90537337502.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/26d27120-1518-46f6-92f4-82d2e391240e/how_to_put_probability_distribution_in_calculator.pdfIn PDF document text
    • http://muliwavanebebo.onlinewebshop.net/data_mining_download.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/84929cf7-833e-4964-8be8-f10ef7d6b4ab/accounting_journal_entries_free_download.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/add2f45b-4ad3-47ee-9a4b-aa78fd024a23/wuzuvoweveruziguxor.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6254ccd8-847f-4327-ae04-553e518b7027/vagakugesenufil.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/20627fb9-e662-4bc9-a3ca-40a5a70283fe/kamien_music_an_appreciation_9th_edition.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/dd2e55e1-316d-46e4-bbf3-5003220f6a23/xusesirumajekonuxifeda.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_off000112be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x112BE 5808 bytes
SHA-256: bc6545e2cd6d44f5475d4d4c67a611d36fa3a2056bbaad58fb634de5bf086ff8
font_01_sfnt_off0001268d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1268D 12156 bytes
SHA-256: 407839af7be46128fea8731e8db69d79aeabd0e763a55cfe7fccf94b2d02c65a

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