Malicious PDF — malware analysis report

Static analysis result for SHA-256 756bbc0cd7fccd3d…

MALICIOUS

PDF

81.9 KB Created: 2021-06-04 03:37:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 527492c273b11b58b9544db86145db7a SHA-1: 71b6a9e271c43057ee9b5a12ca0df93028c3f625 SHA-256: 756bbc0cd7fccd3d568fcde17957a67ce8fb6640a3926e666688112ad6345977
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://philabc.ru/pbw?utm_term=do+facial+exercises+work+before+and+after PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4443814/normal_603c25655e784.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4404299/normal_6003b3c61955c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4381735/normal_6054e9c4bbbe5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4373241/normal_604bc0b7b196a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4473062/normal_5fd277ee8884e.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/331d2e7f-8445-40d1-91b3-e8076a7ea2c4/garmin_gpsmap_62st.pdfIn PDF document text
    • http://ziludezubeju.pbworks.com/w/file/fetch/144462672/sobaxutexemedofuje.pdfIn PDF document text
    • http://kivotin.pbworks.com/w/file/fetch/144550998/how_to_bypass_google_lock_on_samsung_a10e.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6b1482ed-502e-46f0-a55a-184d908b8f22/tamapadipiliwuxija.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/30cd0ee1-9d31-4067-a7e7-49609e7c37b0/what_products_and_services_do_nike_offer.pdfIn PDF document text
    • http://mupalunava.pbworks.com/f/sapozin.pdfIn PDF document text
    • http://molitutolu.pbworks.com/w/file/fetch/144558225/assassins_creed_origins_strategy_guide_book.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/00c12450-a298-451d-b2ac-52502d6200db/diccionario_de_sinnimos_y_antnimos_gratis_para_descargar.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2506eb1b-bc18-412b-848a-036b8ce7527f/bamezemimo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a483c109-f7b9-43b8-8e04-dfb8c1748f40/14742746619.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e5a8840c-e8ab-44c6-b7a2-86db2c060854/53106851200.pdfIn PDF document text
    • http://xojifot.pbworks.com/f/what_is_the_nutritional_value_of_fresh_beets.pdfIn PDF document text
    • http://vedufid.pbworks.com/f/how_to_write_a_psychology_report.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a35777e0-245b-4048-85f0-7595967e776f/gujalisejiloto.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/11271d29-491a-47b0-b795-a82b95388fd1/casio_wave_ceptor_3054.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3952c76b-06d2-4aee-8ca6-9bf0c73bfa1a/utah_dmv_motorcycle_safety_inspection_requirements.pdfIn PDF document text
    • http://mujefapufefi.pbworks.com/w/file/fetch/144516189/4591584209.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_off00010231.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10231 5376 bytes
SHA-256: 4cdedaff13e0499c42c9bbc2ca76d3a28ee8b4723642a17c44592ba40c0d8839
font_01_sfnt_off000114a9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x114A9 11304 bytes
SHA-256: 15cb7c13790635e1e24f95b3d89ff1cd571419642fe670c68e348d0aebbca3e3

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