Malicious PDF — malware analysis report

Static analysis result for SHA-256 eebbc3a266e841bf…

MALICIOUS

PDF

47.2 KB Created: 2020-11-04 22:21:57 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-26
MD5: e64e6799a5f746d966dc6dbaec74a89d SHA-1: d18ab7f160c75eaa35f7833a032c2e78d953863d SHA-256: eebbc3a266e841bfa80f8989f5eba979438a6a307fef21e3daf4b7153b680aff
154 Risk Score

Malware Insights

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

The PDF contains a link farm and a direct link to a known malicious redirector, indicating an attempt to lure users to malicious infrastructure. The document body, though heavily obfuscated, contains the URL that leads to the redirector, suggesting a social engineering pretext related to 'carp fishing'. The ML classifier strongly flagged this PDF as malicious, supporting the conclusion that it is designed to distribute further threats.

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=carp+fishing+guide In PDF document text
    • https://vodipewelo.weebly.com/uploads/1/3/1/6/131637384/b184d0b7edae.pdfIn PDF document text
    • https://dizakevusarebiz.weebly.com/uploads/1/3/4/5/134581037/f50d98e036da.pdfIn PDF document text
    • https://gobumireg.weebly.com/uploads/1/3/1/3/131383916/vuzutukirekugog.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/zunaporam/curse_of_strahd_5e_download.pdfIn PDF document text
    • https://s3.amazonaws.com/jinabisura/tarrant_county_sheriff_inmate_search.pdfIn PDF document text
    • https://s3.amazonaws.com/ropuba/subuvebobizaf.pdfIn PDF document text
    • https://s3.amazonaws.com/susopuzupure/once_upon_a_chef_banana_bread.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3927ed97-1261-4cc0-bc50-b000c3e3ad67/84640418972.pdfIn PDF document text
    • https://s3.amazonaws.com/memul/91764926508.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fa937017-1aa4-48d7-9e79-c927c439f015/wopopaninedabativex.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/543da5fb-bd77-468a-b593-9b350c188883/nutasizuvofurukakawu.pdfIn PDF document text
    • https://s3.amazonaws.com/fowikorejodi/midajevobavixivisozaxujuf.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_off00007c22.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7C22 5176 bytes
SHA-256: 9a8e21395bb716134d3d309967b0ea50fe24916e7bc1519b5f156714621352ec
font_01_sfnt_off00008db6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8DB6 10292 bytes
SHA-256: 2f2e8ddd4a0c9f91f465e73103093b164e41748f19d257e08e4eb5c57514d559

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