Malicious PDF — malware analysis report

Static analysis result for SHA-256 9c16ad5cae21ad9f…

MALICIOUS

PDF

88.6 KB Created: 2021-03-18 00:34:22 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 51141a69f2f48c453e72e679aa83bf3e SHA-1: 12a775304cecf3698cb4bb13c834f09f9a26c630 SHA-256: 9c16ad5cae21ad9f2e588ef4e56b107224c1ab5ad56591001abca9c72f6308b3
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a large number of external links, many of which point to PDF files, indicating a link farm or SEO spamming operation. The primary URL, https://botokaw.ru/strik?utm_term=dolores+cannon+nostradamus+en+fran%25C3%25A7ais, is likely the entry point to this network. While no scripts were explicitly extracted, the PDF structure and heuristic firings strongly suggest malicious intent to redirect users to potentially harmful websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 4

  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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://botokaw.ru/strik?utm_term=dolores+cannon+nostradamus+en+fran%25C3%25A7ais
    • https://cdn.sqhk.co/rivogigaweb/ajiXieX/pilot_log_book.pdf
    • http://differencecheats.net/puwukauzzzo.pdf
    • https://static.s123-cdn-static.com/uploads/4420612/normal_6008ca794a81c.pdf
    • https://cdn.sqhk.co/kogeledewafo/jbhdSha/basketball_mini_hoop_door.pdf
    • https://cdn.sqhk.co/salavogi/hfihXKN/main_full_forms_related_to_computer.pdf
    • http://fringigejy.site/213345354050t1s8.pdf
    • https://cdn-cms.f-static.net/uploads/4414176/normal_604f07290f644.pdf
    • https://cdn.sqhk.co/famagafe/lJhjAib/kewadofufavisasoporuxom.pdf
    • http://yatvoyya.fun/terij4dtcv.pdf
    • https://cdn.sqhk.co/wubukuxivupe/iijdSHb/rumble_bots_game.pdf
    • https://cdn-cms.f-static.net/uploads/4369656/normal_60182fac1a250.pdf
    • https://static.s123-cdn-static.com/uploads/4499958/normal_5fcd64d13663c.pdf
    • https://cdn.sqhk.co/baxemazisod/jgid25B/nhl_ice_hockey_table_game.pdf
    • https://cdn.sqhk.co/gebitasixa/cmiaide/19324182193.pdf
    • https://cdn.sqhk.co/ladetozuxi/hiagg3d/disneyland_paris_packages_from_dublin.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://uploads.strikinglycdn.com/files/742b054d-8113-47d6-abf3-c776a0daa067/sabonagazixonasutudeka.pdf
    • https://5a8aee2d-3d68-4c09-98ed-743c9c56d6fd.filesusr.com/ugd/460efe_5f21b375c4e5473caecc5ddc1e61da50.pdf?index=true
    • https://uploads.strikinglycdn.com/files/0cea39c5-b291-42b0-af08-b8b880a41ed5/leroli.pdf
    • https://uploads.strikinglycdn.com/files/e781f16c-9c34-46b2-bd88-b28ecc9da7c0/my_cloud_macos_app.pdf
    • https://6c8027e1-9878-41b3-a9ef-32ba2b6bcd02.filesusr.com/ugd/185811_2c4e3c5ec45541a993bffcb1894e8b47.pdf?index=true
    • https://uploads.strikinglycdn.com/files/a0b89d78-814e-470e-a78d-6e7ffca01d00/91159471507.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010ce8.bin
020b9b56c2132e2a93b20c2c459e3dca25888262743ecf692864ca6bfcb6b7a4		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10CE8 5232 bytes
font_01_sfnt_off00011e49.bin
80a671ef80bd51c799e506828562312bb6bd5b86baecd3155319cb69bd66c389		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11E49 12400 bytes
font_02_sfnt_off00014573.bin
cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34		 pdf-font-stream PDF embedded font (sfnt) at offset 0x14573 4324 bytes

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