Malicious PDF — malware analysis report

Static analysis result for SHA-256 97a7e052fc28d082…

MALICIOUS

PDF

37.4 KB Created: 2020-10-01 02:26:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-15
MD5: 1996ff4142a282e5ac54b98863d06338 SHA-1: 803b0caf501a1173135b8597e9f822cf15bbda83 SHA-256: 97a7e052fc28d082e0d4759c3f1934c55f9593b3e6f5b1678986ac5b86bbd726
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=guia+de+practica+clinica+cardiopatia+isquemica+pdf In PDF document text
    • http://files.boardexpressions.com/uploads/1/3/1/3/131380895/jebip-modozevu-wimiluvaduvoxox.pdfIn PDF document text
    • http://files.neferkasalukis.com/uploads/1/3/1/4/131437157/jadim-numumaxareper-wilikoxujeresa-fomotiwe.pdfIn PDF document text
    • http://xuziw.kennickbuilders.com/uploads/1/3/1/6/131636677/lokuvemelapawadiso.pdfIn PDF document text
    • http://files.morningrosehouston.com/uploads/1/3/0/9/130969169/75961a.pdfIn PDF document text
    • http://wozelu.amazingbookspgh.com/uploads/1/3/1/4/131452839/sulafogedafagaf.pdfIn PDF document text
    • https://site-1038758.mozfiles.com/files/1038758/82778385205.pdfIn PDF document text
    • https://site-1036685.mozfiles.com/files/1036685/xulanidomopajenakota.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/36e00dfb-8e0b-45a3-b25a-a0e5b62f8ce7/kujogasesufufizomexipet.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ea16858d-eeae-47e8-9444-92200d385c31/92063789287.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ee9cbabc-eac8-48b4-a2a0-782d56321da1/fotokupaxijuje.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/78e4b2d5-5f29-4ee0-952d-c3ca2ba5c86f/jisawupavufofenewon.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/66b3a969-e0e3-4b11-92b5-f1c5ab649d95/tigefi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fb3adbf4-993e-4dfc-9587-351855d4d498/tutomizevofotaxelom.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/831a22f8-3961-4256-b263-ac40660dad08/79254904539.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/985e6d6d-44aa-4967-995b-929ed14b2778/xikalikebaberijijipuna.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_off000052df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x52DF 5460 bytes
SHA-256: 995b41e58372053663da40a51a8a26b8b5367a6217afec442504ea5c5f06b8b7
font_01_sfnt_off0000655e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x655E 10292 bytes
SHA-256: ca3e63626a86c5f689907f46acaee6ef900d2e8c4aa518ab0dd8f0b7e3586bec

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