Malicious PDF — malware analysis report

Static analysis result for SHA-256 a51116e4c60cec4a…

MALICIOUS

PDF

37.5 KB Created: 2020-11-07 04:21:06 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2022-06-20
MD5: 70a73190902113261c5cd42c0b3529ca SHA-1: b1bf800d5d3d280398e0dcf7b1789b1c55562a83 SHA-256: a51116e4c60cec4a0d420275ed02e92f1397b26e8fdc254ec0205141aea37e98
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=mr+lawanson+show In PDF document text
    • https://cdn-cms.f-static.net/uploads/4405194/normal_5f96172df1f50.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/garorowa/25618483691.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6fcb1691-1024-451d-ac46-a83a0b020624/22637655640.pdfIn PDF document text
    • https://numebumi.files.wordpress.com/2020/11/21576588175.pdfIn PDF document text
    • https://jogamoje.files.wordpress.com/2020/11/ikea_brimnes_dresser_assembly_instructions.pdfIn PDF document text
    • https://s3.amazonaws.com/rawesaragegugar/horry_county_probate_court_case_search.pdfIn PDF document text
    • https://rujimalik.files.wordpress.com/2020/11/xefubageziwurifej.pdfIn PDF document text
    • https://xeruluzolu.files.wordpress.com/2020/11/25837274361.pdfIn PDF document text
    • https://s3.amazonaws.com/mejigavukolu/wopidududalok.pdfIn PDF document text
    • https://bevelokoli.files.wordpress.com/2020/11/reglamento_aci_318-14.pdfIn PDF document text
    • https://s3.amazonaws.com/senodiw/american_psychological_association_book_6th_edition.pdfIn PDF document text
    • https://felibule.files.wordpress.com/2020/11/51950985368.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_off00005406.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5406 4872 bytes
SHA-256: 4d789b5ef84ccf51b55aa32a76f238435c4cc17fd87cc7903089e9227a1156bb
font_01_sfnt_off000064a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x64A3 10804 bytes
SHA-256: f06cc6c526793b774d76d1a5d1e3ce67bc9f6df0900ddb07539cb4cf4e3a5e2a