Malicious PDF — malware analysis report

Static analysis result for SHA-256 8814288a1f04f69d…

MALICIOUS

PDF

44.8 KB Created: 2020-11-05 01:30:16 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-02-23
MD5: aec20761baa48169478194ec96f00078 SHA-1: 7ed662eb7b84ceed79c711fdd4462095410fe1b2 SHA-256: 8814288a1f04f69d14f5dc81cedc3038571cfb6e7d9fb5956879961db9b747ee
194 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.
  • 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.
  • 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/123?keyword=what+does+archive+mean+on+gmail In PDF document text
    • https://cdn-cms.f-static.net/uploads/4407997/normal_5f992fb92e681.pdfIn PDF document text
    • https://gorokawuse.weebly.com/uploads/1/3/4/4/134489158/xozasag.pdfIn PDF document text
    • https://fukoxifixe.weebly.com/uploads/1/3/4/4/134460993/dudadavi-vadaz-jubajepubebu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4407807/normal_5f9e85d3e9c30.pdfIn PDF document text
    • https://firedisivimi.weebly.com/uploads/1/3/0/9/130969818/suzusenasunofo.pdfIn PDF document text
    • https://zizavoxepob.weebly.com/uploads/1/3/4/4/134479394/6268350.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://uploads.strikinglycdn.com/files/d666680d-5ee1-4f4a-9758-6ae9c08f52f3/wiberebinonanarakiw.pdfIn PDF document text
    • https://s3.amazonaws.com/limewub/the_oxford_handbook_of_child_psychological_assessment.pdfIn PDF document text
    • https://s3.amazonaws.com/rubidokezive/up_by_jawbone_sign_in.pdfIn PDF document text
    • https://s3.amazonaws.com/mutirexa/aces_etm_scheduling_non_management.pdfIn PDF document text
    • https://s3.amazonaws.com/pafiganovavi/79748829552.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0fecef47-b25c-4c73-b548-291750999f18/8725004796.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005f8c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5F8C 5216 bytes
SHA-256: eea2e9d21fb46085f16791b0bdac97e95e78f51f8390a140fd8fbd416688252f
font_01_sfnt_off0000712d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x712D 13268 bytes
SHA-256: 7868f77994a863e1168d8a9781f6245a8fb794a6002a3f5d5507bddad66f2011
font_02_sfnt_off0000984d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x984D 4324 bytes
SHA-256: 0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333