Malicious PDF — malware analysis report

Static analysis result for SHA-256 b471a7b5ff97d1e4…

MALICIOUS

PDF

44.2 KB Created: 2020-10-01 05:35:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-15
MD5: 70f3729f1c6823a8035023f35550088e SHA-1: b2e7876c4b1e21664e6e5ea475a302759d0f4fdf SHA-256: b471a7b5ff97d1e4b51e00236894d1807446adfdedeac88a7ab000aaf2d32537
184 Risk Score

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://cctraff.ru/strik?keyword=phonics+activities+for+kindergarten+pdf In PDF document text
    • http://xalesuvab.prixusmedical.com/uploads/1/3/1/3/131380183/nulonevob-juxojev-patuzes-jodifijibupa.pdfIn PDF document text
    • http://mulal.timeundertensionwellness.com/uploads/1/3/1/4/131482952/wosina-dogukovomu.pdfIn PDF document text
    • http://files.heatherbelleink.com/uploads/1/3/0/8/130874691/fovebup_mitifozirasuzo_totizawer_jopena.pdfIn PDF document text
    • http://files.westerncanineacademy.ca/uploads/1/3/1/3/131383664/lobop.pdfIn PDF document text
    • http://files.twochicksandarod.com/uploads/1/3/1/8/131871909/73901e47ef.pdfIn PDF document text
    • http://files.historydbqs.com/uploads/1/3/2/6/132681479/d154633e0d971ed.pdfIn PDF document text
    • http://files.mindfulnessnow.co.uk/uploads/1/3/0/7/130775498/podirefibom.pdfIn PDF document text
    • http://suvomibew.alpineanimalhospitalburton.com/uploads/1/3/1/0/131070045/058d0b8.pdfIn PDF document text
    • http://files.scarykustoms.com/uploads/1/3/1/8/131856456/6ca5f183.pdfIn PDF document text
    • http://files.sonsofthesaviormm.com/uploads/1/3/0/9/130969440/gipalokeguxe.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/0dbf6ed5-68a1-4ea1-88c0-2605e6470ee7/nedesor.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/40261a02-5e07-4007-8f15-0cdd6d31e235/39541491644.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/230352ea-8d43-47b8-be23-f988439e8a53/movozomiredibisumowuxewi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f203c5bd-1c9e-45b1-b2a6-e3adf2240013/57301727567.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6f565a3f-f365-48a5-9047-d0176bacc52f/wajiwiwiw.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4fd08180-d349-4e67-b5df-9111e8a7bdfd/gekojuxosirodetulonofev.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_off00006d52.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6D52 5508 bytes
SHA-256: 60f9d7d2b76ad652442709000fa9fc76eae925d9dd0a3816fe7b1481bdee1597
font_01_sfnt_off00008017.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8017 10552 bytes
SHA-256: 4fb9b5dbe7756e921c9ab1e978911195c090c8dda6d58a20b9d3b76afbf92f93

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