Malicious PDF — malware analysis report

Static analysis result for SHA-256 9d0463bf7dcb2d47…

MALICIOUS

PDF

71.8 KB Created: 2021-03-30 13:41:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 23f98c02e6fc4741043abd2e7cf94f7d SHA-1: c27536b76091e7f17bccd7c249a7787a1db894b8 SHA-256: 9d0463bf7dcb2d47b90fe7645226bdf549a398ca2b843f4f4d9edadaa4002178
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 0.9998

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://leonvi.ru/123?utm_term=solubility+rules+for+ionic+compounds+worksheet PDF link annotation
    • http://dovujaxemedu.mygamesonline.org/jarchas_y_cantigas_de_amigo.pdfIn PDF document text
    • http://vobafoselalulor.mypressonline.com/zebuxowazevigomew.pdfIn PDF document text
    • http://poxumanavofeboz.scienceontheweb.net/dialectical_journal_example_to_kill_a_mockingbird.pdfIn PDF document text
    • http://zijozarub.mygamesonline.org/18142705500.pdfIn PDF document text
    • http://taxevidel.medianewsonline.com/koledilemunumezuxog.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4369187/normal_600828cdf346d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369524/normal_60559e838c39f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4470833/normal_600a2a1559f49.pdfIn PDF document text
    • http://nabavawuzafurur.mygamesonline.org/asme_section_ix_training.pdfIn PDF document text
    • http://luwogexejel.getenjoyment.net/97205247699.pdfIn PDF document text
    • https://samojosaletope.weebly.com/uploads/1/3/4/0/134017273/8284665.pdfIn PDF document text
    • http://raxejudesezix.scienceontheweb.net/boraju.pdfIn PDF document text
    • https://fojomuku.weebly.com/uploads/1/3/4/4/134447263/widekaxoxagutepo.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://wuxosalilujaza.atwebpages.com/replication_in_prokaryotes.pdfIn PDF document text
    • https://e53c8fcc-339b-4d8f-83f6-44ddc8c6ace4.filesusr.com/ugd/1ea9c4_322310cea81b4556836698431873e8b5.pdf?index=trueIn PDF document text
    • https://78e27e65-9996-4239-a63d-7a21722db537.filesusr.com/ugd/03f576_207eadc7d60641979e6f52ad6680e9c8.pdf?index=trueIn PDF document text
    • http://jonesojawu.myartsonline.com/mufatalizibox.pdfIn PDF document text
    • http://gagugitebuf.atwebpages.com/putana.pdfIn PDF document text
    • http://bufijonewufo.onlinewebshop.net/physics_for_scientists_and_engineers_4th_edition_access_code.pdfIn PDF document text
    • http://koriwironawuva.myartsonline.com/how_to_show_data_table_in_chart_excel_2013.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_off0000dc61.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC61 5684 bytes
SHA-256: 8c8053d2ae0e45c0a35b5e97b864d1a8ac34c8bd13850eea51bfe567bf3c78e9
font_01_sfnt_off0000ef9e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF9E 10048 bytes
SHA-256: bbc71a2cec7d72199d4b84ae64857aca013bfa36ec0c3690eca70b22245bbfb5

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