Malicious PDF — malware analysis report

Static analysis result for SHA-256 4e81ec380725ec8b…

MALICIOUS

PDF

44.3 KB Created: 2020-10-10 06:26:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-15
MD5: 3bbaacf4531223a62e15d62fc90e5692 SHA-1: ef5fbb15095ca070097f0941a50379ee631314be SHA-256: 4e81ec380725ec8bf59b1bfa3ad02df392b0808baeae3bcd629c8f92d1d5c9dc
124 Risk Score

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 4

  • 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 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=english+2h+socratic+seminar+answers+collection+3 In PDF document text
    • https://site-1038758.mozfiles.com/files/1038758/fuxowojuxeve.pdfIn PDF document text
    • https://site-1036681.mozfiles.com/files/1036681/29049550738.pdfIn PDF document text
    • https://site-1036629.mozfiles.com/files/1036629/49747812295.pdfIn PDF document text
    • https://site-1038438.mozfiles.com/files/1038438/78565455384.pdfIn PDF document text
    • https://site-1042100.mozfiles.com/files/1042100/dorugugiduvatavimo.pdfIn PDF document text
    • http://files.rivercitychristianschool.org/uploads/1/3/0/7/130738679/3726187.pdfIn PDF document text
    • https://site-1039174.mozfiles.com/files/1039174/6250316142.pdfIn PDF document text
    • https://site-1037180.mozfiles.com/files/1037180/miginoreti.pdfIn PDF document text
    • https://site-1038904.mozfiles.com/files/1038904/44379555672.pdfIn PDF document text
    • https://site-1038303.mozfiles.com/files/1038303/xaleboxilurur.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/88424825-ee95-44a4-b92f-b587add2f455/dasakudaliniwujobujob.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d11df70b-2514-4a3d-b415-ef58d7749fa9/bogigekuzupiwer.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d9f4efb6-b35d-4283-a401-f0f9abc74ad3/xubawimutiweje.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c12abd20-db3e-471c-a138-d58af78d13b0/devusonen.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_off00006d67.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6D67 5556 bytes
SHA-256: 8682b5c1ebd451a45fdeb8d17df3c6c413261ce777ecdad2ae9c2f7aa44956ca
font_01_sfnt_off0000803c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x803C 10796 bytes
SHA-256: ff9d6d9bbab2278974fba4eb054c160bfd4f8963f1b29443a047d98cae022b6e

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