Malicious PDF — malware analysis report

Static analysis result for SHA-256 3c81bb79c040e117…

MALICIOUS

PDF

42.1 KB Created: 2020-11-07 05:58:27 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-01-11
MD5: 4a4ca8bb4f625e15d72a50f0e3acd5da SHA-1: 3fcdde0715ae5cbfdf9b46a00ff1d5e43edbe1fb SHA-256: 3c81bb79c040e11773c89f34e395a125ba84159bbc6ef360a413e882596be042
126 Risk Score

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

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://traffset.ru/aws?keyword=pinterest+thanksgiving+classroom+door+ideas PDF link annotation
    • https://pojosividadom.weebly.com/uploads/1/3/4/5/134524524/kusigodavu_malejebuv.pdfIn PDF document text
    • https://dufavepuxafolim.weebly.com/uploads/1/3/4/2/134266173/xosef.pdfIn PDF document text
    • https://kidivine.weebly.com/uploads/1/3/4/5/134576756/senedemutonus.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450723/normal_5fa162e55365f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4382197/normal_5f9a04a48c925.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417037/normal_5f9db4248be7c.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://likuzow.files.wordpress.com/2020/11/40264502684.pdfIn PDF document text
    • https://s3.amazonaws.com/tosasugokod/avast_free_antivirus_with_license_key_free.pdfIn PDF document text
    • https://s3.amazonaws.com/xifabilejilab/54255467852.pdfIn PDF document text
    • https://sukifozupi.files.wordpress.com/2020/11/voruzosov.pdfIn PDF document text
    • https://vadazigifexe.files.wordpress.com/2020/11/gopiv.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_off000065aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x65AA 5476 bytes
SHA-256: 2481631a9b656d50266d9639579311fead0c4774cd74ed9fb545ae1ab0f52604
font_01_sfnt_off00007827.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7827 10388 bytes
SHA-256: 7f273b503374047f7a8254aa331abf4501af8e712761304a98da4a0b505c35d9

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