Malicious PDF — malware analysis report

Static analysis result for SHA-256 3b7fba879f8e23ee…

MALICIOUS

PDF

41.8 KB Created: 2020-09-30 23:51:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-10
MD5: 18a05adc6cbd6405eb1f74dd5e836f2a SHA-1: e40921bccca842bf13477b2d14a3ec9ef9b044d8 SHA-256: 3b7fba879f8e23eec5340a9796f354cda5155898cec699f256a62ec690a9d351
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=arquitectura+barroca+mexicana+pdf In PDF document text
    • https://site-1037235.mozfiles.com/files/1037235/2556384621.pdfIn PDF document text
    • https://site-1036962.mozfiles.com/files/1036962/55481048790.pdfIn PDF document text
    • https://site-1037887.mozfiles.com/files/1037887/27254779356.pdfIn PDF document text
    • https://site-1037086.mozfiles.com/files/1037086/39362472110.pdfIn PDF document text
    • http://pomawezos.casadefamiliaguate.com/uploads/1/3/0/9/130969018/koxof.pdfIn PDF document text
    • http://files.niwotcounseling.org/uploads/1/3/0/7/130739895/kogazakumapatexav.pdfIn PDF document text
    • http://files.mariomanzini.com/uploads/1/3/1/4/131453136/5073355.pdfIn PDF document text
    • http://tavulare.everlastingrockministries.org/uploads/1/3/1/6/131637789/dajudiribexozo.pdfIn PDF document text
    • http://ralaka.davidwaltersministry.com/uploads/1/3/0/7/130739860/ledexelo_nokijipe_kobiwepaj.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/c1316022-9645-4b36-9115-dc9794e12965/lunisupo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1ab779c8-8355-454f-877f-1a12785d566a/94419268863.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5073dbc4-e17c-4992-8b18-8863df76a2d3/39748859328.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fd9f57be-64d4-4384-ba3f-6e6fee576c14/xetodifixirufuzag.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7110802f-2a97-47b1-8dfe-61fe3c438195/kokuxeneter.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/2739/8807/files/bilurixatulu.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/9550/7622/files/95526184293.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_off0000653f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x653F 5416 bytes
SHA-256: 1ef3c189cfd38cf449a0b80d90173e439d3ff0a59869d807af5ff9d99905d74d
font_01_sfnt_off00007794.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7794 10180 bytes
SHA-256: 1e1525fdcd2b2105ba9f22b639ff4661a2a69c8f39e8e6bdf217f82658048b8c

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