Malicious PDF — malware analysis report

Static analysis result for SHA-256 8c4a9b3d5ac9520e…

MALICIOUS

PDF

44.3 KB Created: 2020-11-06 10:02:43 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-01-23
MD5: eab9ac6bf9b80532065e8b2f8f1f7461 SHA-1: 88c6e3dc94a5033a4c2ecce43d506a3e366a0ad9 SHA-256: 8c4a9b3d5ac9520eaa76f543abad0ee9abad2595f4baaa5993dd7af5eaebe316
136 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.
  • Image lure linking to an SEO redirector (free-download phishing) high PDF_SEO_UTM_REDIRECTOR_LINK
    PDF embeds an image with little or no body text and a clickable link to a multi-word utm_term / FeedBurner-proxied SEO redirector — the 'free ebook / solution-manual / document download' phishing family that ranks for natural-language search queries and routes the user into a payload/redirect chain. The PDF carries no exploit; the risk is the linked destination. Flagged structurally (image lure + SEO redirector) so it does not depend on a ClamAV/ML signature, and regardless of how many filler text pages the lure carries.
  • 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=the+piano+teacher+2001+watch+online PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4420600/normal_5fa4909c6528c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4409246/normal_5f965531c1f6a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4411926/normal_5f9ac03840fe7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4424683/normal_5fa2a399d276d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4373757/normal_5f9e50d2f31e6.pdfIn PDF document text
    • https://dizuzoboxok.weebly.com/uploads/1/3/4/3/134351397/kakujuzi-senupaxirozipoz-pasezitogadaj.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://cdn.shopify.com/s/files/1/0502/6748/8411/files/tratamiento_psicologico_anorexia_nerviosa.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4c0d820c-7387-4c9e-bad2-aef0d6841937/7402923484.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3ccfae17-027d-4c35-b964-8a458ba6e06e/naruto_shippuden_netflix_release.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0504/3932/3837/files/audio_manager_apk_for_iphone.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1023e83a-db71-48a6-af22-8f54a582cfe7/37379409312.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1a5327fa-80bc-4f3b-ba99-e0d400d6f47e/39125563828.pdfIn PDF document text
    • https://s3.amazonaws.com/bajuse/neleruriderig.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_off00006fb1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6FB1 5212 bytes
SHA-256: eaf1ea5947f801a2200f479e313563087d8a2087bd9df598f38ccb4ceb83cb86
font_01_sfnt_off00008176.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8176 10352 bytes
SHA-256: 0c1e38b87ce462431d36e6d12dd6ea4c814447e32c5f3c64468d87cabae398e6