Malicious PDF — malware analysis report

Static analysis result for SHA-256 1ce2d4fc257f0477…

MALICIOUS

PDF

75.8 KB Created: 2021-05-13 05:37:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: bfb446501b8d4e6bec601551500e733e SHA-1: 9a445cca66db1cbf6fd8a800a54b4218756f2b38 SHA-256: 1ce2d4fc257f047748c2aaa0b0fdbcf7904b5a6bbad7967677a12b49be835bac
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 0.9997

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://xajibur.ru/strik?utm_term=born+a+crime+audiobook+chapter+1 PDF link annotation
    • http://janusadow.mygamesonline.org/masonry_construction_details.pdfIn PDF document text
    • http://timecodes.net/xunilasa2fo.pdfIn PDF document text
    • http://tipenedebila.22web.org/when_to_change_transmission_fluid_focus_st.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4501054/normal_5fcba9e02d295.pdfIn PDF document text
    • http://fabulouss.space/latuzapaduxavotupurijc9smq.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4476001/normal_6039bde182346.pdfIn PDF document text
    • http://kolekewoni.mywebcommunity.org/certificado_antecedentes_contraloria.pdfIn PDF document text
    • http://salebox.shop/forming_compound_words_worksheet_grade_6cdvfj.pdfIn PDF document text
    • http://wisifugapu.22web.org/91470605942.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4469126/normal_6059ee0ddbe69.pdfIn PDF document text
    • http://verifiedbadge-lnstagram.com/11413466619yy0df.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4492281/normal_6058cb077f1a5.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/nufidibodudulad/38133374885.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6011f5dc-1edf-48aa-8660-9e73161c98ad/focusrite_scarlett_2i2_1st_gen_vs_2nd_gen_vs_3rd_gen.pdfIn PDF document text
    • http://dogumimuzelu.epizy.com/89432542411.pdfIn PDF document text
    • https://s3.amazonaws.com/dinisemowoge/macmillan_gateway_b2_workbook_answers_unit_5.pdfIn PDF document text
    • https://s3.amazonaws.com/piradi/heroes_of_hammerwatch_4th_boss_guide.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2e57e4db-665c-4d04-ad51-6300cec8d1ec/47278028651.pdfIn PDF document text
    • http://kefuvazaleneze.rf.gd/33640004877.pdfIn PDF document text
    • https://s3.amazonaws.com/divelikubapiwaj/wifi_connector_app.pdfIn PDF document text
    • https://s3.amazonaws.com/vigevot/pixixenivetolesuropilo.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_off0000e649.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE649 5408 bytes
SHA-256: 2624b48d47e6be62b65d04cb63f7295df0174f7ce0f8da448bdd4a71f27e3f89
font_01_sfnt_off0000f885.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF885 11644 bytes
SHA-256: 734603e7a50706cb2ccb0c674d9cb2b999a62e59706a9923ff34452f7d0e34d9

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