Malicious PDF — malware analysis report

Static analysis result for SHA-256 b0d0a6a5901357d8…

MALICIOUS

PDF

74.1 KB Created: 2021-06-11 01:16:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: c4fee07309c15c62f40b2134c79f5444 SHA-1: 6298d9f6279c55520e769a6075eab5ad033fdfad SHA-256: b0d0a6a5901357d8a9bc4044ce9cdb0c012ce6609af7c91685c49829055eee95
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 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

  • 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.
  • 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://nomylo.ru/wb?keyword=kyocera%20fs-1135mfp%20default%20password PDF link annotation
    • https://bonizilolalov.weebly.com/uploads/1/3/4/4/134458774/lavebugebuzusuzelo.pdfIn PDF document text
    • https://fabidarupevonu.weebly.com/uploads/1/3/4/6/134620419/ziruraxo_riwefixuju.pdfIn PDF document text
    • https://patobozojewe.weebly.com/uploads/1/3/4/8/134863794/26960.pdfIn PDF document text
    • https://fipuwetula.weebly.com/uploads/1/3/3/9/133997959/c752d524e8bc189.pdfIn PDF document text
    • https://milunuvaxifefa.weebly.com/uploads/1/3/3/9/133997440/wosizapa-leleno-fubakogibo-dabekotezomamu.pdfIn PDF document text
    • https://paxogusav.weebly.com/uploads/1/3/4/0/134040839/69141.pdfIn PDF document text
    • https://kudiwugeditonaf.weebly.com/uploads/1/3/5/9/135964520/kenuxofakaxarax.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/aeb2e46e-43fc-4ba6-a49e-49e47118f039/the_boy_in_the_striped_pajamas_analysis_essay.pdfIn PDF document text
    • http://furalagaposu.pbworks.com/w/file/fetch/144559164/pioneer_sx_1080_vs_1050.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7e58c36f-d527-4242-953a-3c093ae70a0a/fundamentals_of_fluid_mechanics_8th_edition_gerhart.pdfIn PDF document text
    • http://nukuxim.pbworks.com/w/file/fetch/144529395/usmle_first_aid_book_used.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2a9c6642-c787-44b7-ba41-677be97a4f31/panasonic_cordless_phone_sale_canada.pdfIn PDF document text
    • http://kokoxudalux.pbworks.com/w/file/fetch/144427833/90095514584.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/07ea9cea-af9c-4913-afc6-8771ccd8982e/41769106292.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c39125f1-1d16-4a51-84c1-d76b01b1b590/28484053837.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ae1fe21b-d253-411c-a291-1c8da1326b1e/maths_simplification_tricks_in_hindi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b7fc46f2-8bd5-485d-9b60-1024b78ee851/how_to_import_in_autocad.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d87a9e7e-260a-4177-8dd0-e7a7fc4041fd/how_much_did_fifty_shades_of_grey_book_make.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cd7bfe01-f7fa-4600-a5cc-559440507454/how_to_write_employee_self_assessment.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_off0000e107.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE107 5836 bytes
SHA-256: 440195d7a9e5f7e8c8728f07eca8583500a9c5ffd7f357563c5ecbd93c5f1db8
font_01_sfnt_off0000f4ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4FF 11144 bytes
SHA-256: a1b0be39d0af1a07bdd0e83940cebe87bc0864171e51b6616cf75dd3db0650b6

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