Malicious PDF — malware analysis report

Static analysis result for SHA-256 47bcf40e26498bf7…

MALICIOUS

PDF

41.4 KB Created: 2020-10-01 06:01:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: f7bf2afe9fe9663f5a3eccb0d50d5135 SHA-1: d58b739bc0c9fb9f0ab59d68b4d41cf79e99401f SHA-256: 47bcf40e26498bf77b85336a4e88610969a5b41cc9643e7c1079b682d87f2dcb
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous links, with one prominently displayed as 'antibody screening procedure pdf' leading to a known malicious redirector. The ML classifier strongly flagged this PDF as malicious, and the heuristic firings indicate it's a link farm designed to redirect users to malicious infrastructure. The presence of embedded URLs and the overall structure suggest an attempt to trick users into visiting a harmful site, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 4

  • 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.
  • 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/strik?keyword=antibody+screening+procedure+pdf In PDF document text
    • http://ripemid.shueyvillechurch.org/uploads/1/3/1/8/131857445/fabadex_zazawuzunatife.pdfIn PDF document text
    • http://files.loneezyvisionz.com/uploads/1/3/0/7/130739544/besup_gipokafiposipo_duguzipo_ledemefilema.pdfIn PDF document text
    • http://files.ricor.info/uploads/1/3/0/7/130775537/nadovesi_lovetade_lesup.pdfIn PDF document text
    • http://files.centrechurchvermont.org/uploads/1/3/1/6/131606490/3644542.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/8375/0821/files/fraction_decimal_to_percent_worksheet.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/0151/1068/files/22804410963.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/1523/2921/files/48205084049.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/4098/7543/files/red_de_historieta_asia_minisite_toon.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/91e5363e-3d6b-4026-99a7-7bcf25352dfd/toloba.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/dd07724d-a84c-4318-97ec-d33ae5f42a3d/jotofi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c073830e-1725-4c30-adfe-cff64adee5c4/29080376566.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4ce039f8-c81b-48ac-a9d8-290f185a5069/moronus.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_off000063d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x63D0 5312 bytes
SHA-256: 78b16691a47bda40e70520de1f77e027c2ee58c5e6bc4ee7a8d7c13600942131
font_01_sfnt_off000075fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x75FB 10376 bytes
SHA-256: a4643326ecd2020a841366d5c0579d93d5725790a4ea4f3787d52f2348b4cfe4

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