Malicious PDF — malware analysis report

Static analysis result for SHA-256 e846a4031f156f42…

MALICIOUS

PDF

43.6 KB Created: 2020-11-01 05:03:11 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-15
MD5: 99393ba89ed55cf794fd674e0cd55239 SHA-1: fe2a4ed57d4b2c8a67951f3cd33f71aedee69ee9 SHA-256: e846a4031f156f42a6031168e77cfa47358c5ead6e552273d34fa9d8cd5e0121
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://ggtraff.ru/aws?keyword=personality+disorders+in+children+checklist In PDF document text
    • https://fijojonibiw.weebly.com/uploads/1/3/2/6/132681787/jibigamefomoni.pdfIn PDF document text
    • https://nikoxutaju.weebly.com/uploads/1/3/1/3/131378952/pivalakiminu-zarimewiwotujat-juvogujebe.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369665/normal_5f8c42da3df67.pdfIn PDF document text
    • https://sujajikozodes.weebly.com/uploads/1/3/1/3/131384638/980538c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387706/normal_5f9de3854b143.pdfIn PDF document text
    • https://nufivoba.weebly.com/uploads/1/3/4/0/134017608/3547587.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4377674/normal_5f89f6f5cce3e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408981/normal_5f938852ebe6b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4392857/normal_5f9e00cbb69ba.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4405687/normal_5f9554244cb23.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4381978/normal_5f8cfae7d40d8.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/susopuzupure/21479290644.pdfIn PDF document text
    • https://s3.amazonaws.com/vavebufevodutob/tidojerutadotor.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5fde017c-e518-44a3-8f34-beb54ec64fcd/bicsi_cabling_installation_manual.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e4f0a0c2-015f-480b-b9f1-67e7e6e6953b/15597379355.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_off00006c20.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6C20 5192 bytes
SHA-256: afe666154fbb8bc57620ded9eb8a563562622a5c5b207649430cc2d6cd068ea2
font_01_sfnt_off00007dc7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7DC7 10388 bytes
SHA-256: f57762ab0a1df611398a19199df0d3792b9475f7cf85515aba6fe62817de4cbb

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