Malicious PDF — malware analysis report

Static analysis result for SHA-256 23f7ec37567c2ceb…

MALICIOUS

PDF

40.8 KB Created: 2020-11-09 12:39:57 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-01-11
MD5: f8fb728c747add91a900dafcb91dce80 SHA-1: 35666b934ace114ab03afe5bf590f15e8fe865f2 SHA-256: 23f7ec37567c2cebb6278c4f3471be8bca770a778bcbd7094ec629fcf1b50bee
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/123?keyword=duke+cfp+program PDF link annotation
    • https://siregudak.weebly.com/uploads/1/3/0/7/130738759/0d47913441.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366957/normal_5f8bddd640cd5.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/zirojopemup/80223395403.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6c562c5f-e386-42ea-beed-ac71f126778a/emberde_yay_uzunluu_7._snf.pdfIn PDF document text
    • https://s3.amazonaws.com/pisik/81737921494.pdfIn PDF document text
    • https://s3.amazonaws.com/wilugugo/99798323938.pdfIn PDF document text
    • https://s3.amazonaws.com/sepawi/fadewukopipag.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2385e8fc-6982-468e-9694-510d9e4818de/dog_adoption_certificate_template.pdfIn PDF document text
    • https://s3.amazonaws.com/lupuvogotog/kinotuzasasitoxujozetebo.pdfIn PDF document text
    • https://s3.amazonaws.com/polojuliragam/95998593756.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_off00005e20.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5E20 5188 bytes
SHA-256: c829cf39a7e7ed48113d46eecdbc7a6c6b09c121be4c07f57e5a5ae9cc991e3f
font_01_sfnt_off00006fc8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6FC8 11872 bytes
SHA-256: 8241243e8803011cf346d97ea69975455cd2805c1bee2d6c7c376062e7b134d5