Malicious PDF — malware analysis report

Static analysis result for SHA-256 9c5b35f23785301b…

MALICIOUS

PDF

77.4 KB Created: 2021-03-23 13:58:18 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: 95707d60a4d67a85a8ad1005bda3caa5 SHA-1: 251cc798b5328ff3958910e28622f2f47001487c SHA-256: 9c5b35f23785301b26d39bb7da9a7e5b30f36b47d0f680a26a1065eab3461290
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 0.9991

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://xezojetit.ru/123?utm_term=fha+guidelines+on+delinquent+student+loans PDF link annotation
    • http://evatopshop.xyz/wepixujotigmv4j.pdfIn PDF document text
    • http://bovewitavivebu.getenjoyment.net/xizigisabalazezevubetujom.pdfIn PDF document text
    • http://sazinoz.mypressonline.com/pivesinema.pdfIn PDF document text
    • http://migerov.xyz/how_to_make_screen_smaller_macz1crt.pdfIn PDF document text
    • http://copyrightsupporthelpcenter.com/99024665204xpdbn.pdfIn PDF document text
    • http://kapusta.pro/zixitutosuwazu7cr.pdfIn PDF document text
    • http://itanah.space/kuzajkjl8m.pdfIn PDF document text
    • http://ultra0.space/winrar_32_bits_windows_74r874.pdfIn PDF document text
    • http://idealica-ordina.site/19571692402covvv.pdfIn PDF document text
    • http://ritegifufefut.scienceontheweb.net/13754696368.pdfIn PDF document text
    • http://fineagencyy.com/how_to_draw_position_time_graph_from_velocity_time_graphvjq54.pdfIn PDF document text
    • http://mebovedu.getenjoyment.net/tesis_arquitectura_sustentable.pdfIn PDF document text
    • http://nigma24invest.online/puvadevizevif08f3u.pdfIn PDF document text
    • http://virnet77.ru/linux_for_dummies_10th_editionzsxgs.pdfIn PDF document text
    • http://jushq.pro/august_month_current_affairs_2019_testbookn7tfz.pdfIn PDF document text
    • http://arevakar-travel.com/625648297239xzp4.pdfIn PDF document text
    • http://atomyimperial.ru/35976380994junmp.pdfIn PDF document text
    • http://oneshops.space/76018544645lq1bz.pdfIn PDF document text
    • http://gepokupaburorew.mywebcommunity.org/what_order_should_i_read_the_wizard_of_oz_books.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://0c6b7a74-1ca0-41da-943c-c268a208a416.filesusr.com/ugd/fef373_9bd5ee9f3b9544f0a4a85f3a78443fe8.pdf?index=trueIn PDF document text
    • https://983c8978-ad56-435f-a988-47358aa6040c.filesusr.com/ugd/06a663_39a9f9cab59f45f48812f371c5bdf0f0.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/8b88b1c2-827c-4584-ae26-83c2149a3e40/english_idioms_in_use_intermediate_book_with_answers_vocabulary_reference_and_practice.pdfIn PDF document text
    • https://bdc3fad0-85dd-4e34-85f7-620d54d4ff6f.filesusr.com/ugd/10cedf_6e5844891c374034b90bde9d73d8ae91.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/533c02cf-6d11-45d4-a9e8-af6219ff1d12/how_to_turn_on_hp_desktop_monitor.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_off0000f25c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF25C 5072 bytes
SHA-256: 475805927cd28757cfba2cf858e18d0a8a92f2350fcd1808b7b6971b1a3870e2
font_01_sfnt_off00010397.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10397 10712 bytes
SHA-256: 397a0fe254f14bea1d2e9439c51e49498a8290efa563b4c5483a5590bd71d0c1

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