Malicious PDF — malware analysis report

Static analysis result for SHA-256 3d8c8d4fe504028e…

MALICIOUS

PDF

39.8 KB Created: 2020-11-06 19:22:43 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-17
MD5: 165c514532b98a2c16c52c8268357301 SHA-1: b5abd13377439779b8a0cf649a96e51a42f4ec5a SHA-256: 3d8c8d4fe504028e201220759ea181f5dac8dd29d24752739f6c17255fecd38b
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://traffking.ru/aws?keyword=break+of+bulk+point+aphg In PDF document text
    • https://mumixopid.weebly.com/uploads/1/3/1/8/131872042/f64cd4a1194af8d.pdfIn PDF document text
    • https://xejibojap.weebly.com/uploads/1/3/4/3/134310503/7097377.pdfIn PDF document text
    • https://kojepogezoxuta.weebly.com/uploads/1/3/4/4/134487575/vizofaxekuwemesesava.pdfIn PDF document text
    • https://babikovinemixe.weebly.com/uploads/1/3/1/8/131856339/kaduparaje.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4386079/normal_5f9494528583d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4426942/normal_5f9a7f0214fda.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369166/normal_5f9759d2d9ee9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4372985/normal_5f9e7567078bc.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369653/normal_5f8d3ebfc26a2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4386091/normal_5f9249288efe9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367937/normal_5fa2ce70b3498.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4382948/normal_5f96b5f3000b1.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/wulotugadag/lusubuluvanibikomulomebag.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_off00005e97.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5E97 5236 bytes
SHA-256: c5905ac3fd1157aea757189ccc5322a961aca61275a9c762dd86034405b58792
font_01_sfnt_off0000706b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x706B 10220 bytes
SHA-256: de4c068c1096f847453eb9cd07a02e032b43b2a011279c9b6f8576f1631c9796