Malicious PDF — malware analysis report

Static analysis result for SHA-256 ec4ed90e0d3326e4…

MALICIOUS

PDF

76.5 KB Created: 2021-03-15 17:13:35 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: 8ba1b3a0b1aadb6383a076cfa8401ce1 SHA-1: c883cbb01e5d5bf983e6fa90e059cdd6fbf3d46c SHA-256: ec4ed90e0d3326e403f51a5a8eb86416bbb11e325d479d199c29f247dfaadfd2
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-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://kuzutuzo.ru/123?utm_term=newsletter+format+email PDF link annotation
    • https://cdn.sqhk.co/vixukose/hegegia/comic_stars_fighting_games_lol.pdfIn PDF document text
    • https://cdn.sqhk.co/divoxisig/ix7jkXw/technical_project_manager_jobs_in_denver.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4485322/normal_602fc54f21f9e.pdfIn PDF document text
    • https://cdn.sqhk.co/niporatibu/idSaEhg/lowe_s_stock_price_futures.pdfIn PDF document text
    • http://prizinsta24.online/camry_maintenance_required_light_flashing2p1rh.pdfIn PDF document text
    • http://livetajo.22web.org/33833305378.pdfIn PDF document text
    • http://natur-bio.space/100259454016mmsu.pdfIn PDF document text
    • http://firavowinoza.iblogger.org/bittorrent_free_for_windows_32_bit.pdfIn PDF document text
    • http://getinugalukef.iblogger.org/dimok.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4420776/normal_603abcd2b27e2.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4501645/normal_6002c33cd34f5.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://juropap.rf.gd/how_to_reset_garage_code_clicker.pdfIn PDF document text
    • http://lamujep.rf.gd/kagilulonubut.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d0bbe326-19dc-4d9a-b68d-eaa32dbdffe3/6840125177.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/49d93ee0-09fd-4a25-8989-794f996c0d7f/casio_g-shock_mudman_solar_compass_9300.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/269386fc-8c18-44be-9f8b-876f03d81cd3/78632254615.pdfIn PDF document text
    • http://zogutofarori.epizy.com/dragon_roost_island_music_sheet.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/02cab545-d1a2-436a-bcfb-d388b842b306/wonumemidexinijozeg.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/21c55383-b9dc-4eff-8e2a-0ac6258cfab1/cuantos_kilos_tiene_1_metro_cubico_de_arena.pdfIn PDF document text
    • http://zarevarepi.epizy.com/simplified_cribbage_rules.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_off0000ef24.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF24 4972 bytes
SHA-256: 7812866876eed2b9640459e2a9b108e567b54f2d0a72a86b0b633a8f662b3bc6
font_01_sfnt_off00010005.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10005 10932 bytes
SHA-256: 0d5ccc53b1b7a5ff5d02b0950493df65049b3bbb725202aafa521f05a8c82ef5

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