Malicious PDF — malware analysis report

Static analysis result for SHA-256 236a5d5b3b32949f…

MALICIOUS

PDF

57.8 KB Created: 2020-10-01 22:43:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-15
MD5: e8bb79ccd269a64afa9c71afcae8f348 SHA-1: 335e13c20498a4a6b1b370bbb10a25430a71f9de SHA-256: 236a5d5b3b32949f5a1e03be42942f8283f562ed976bd2c4ac6d7d83135c3b12
124 Risk Score

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 is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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://gettraff.ru/strik?keyword=bsc+forensic+science+syllabus+pdf In PDF document text
    • https://site-1037028.mozfiles.com/files/1037028/18308853474.pdfIn PDF document text
    • https://site-1036855.mozfiles.com/files/1036855/kumepatofitadibaxav.pdfIn PDF document text
    • https://site-1038707.mozfiles.com/files/1038707/94145575975.pdfIn PDF document text
    • https://site-1039375.mozfiles.com/files/1039375/81390517397.pdfIn PDF document text
    • https://site-1039797.mozfiles.com/files/1039797/19792905260.pdfIn PDF document text
    • https://site-1037204.mozfiles.com/files/1037204/26383619237.pdfIn PDF document text
    • https://site-1036821.mozfiles.com/files/1036821/79076406380.pdfIn PDF document text
    • https://site-1036814.mozfiles.com/files/1036814/lozevenunimudorima.pdfIn PDF document text
    • https://site-1037091.mozfiles.com/files/1037091/58950940519.pdfIn PDF document text
    • https://site-1036719.mozfiles.com/files/1036719/99144157275.pdfIn PDF document text
    • https://site-1039219.mozfiles.com/files/1039219/51065997194.pdfIn PDF document text
    • https://site-1037246.mozfiles.com/files/1037246/87579779704.pdfIn PDF document text
    • https://site-1036791.mozfiles.com/files/1036791/87456404964.pdfIn PDF document text
    • https://site-1036997.mozfiles.com/files/1036997/5000950722.pdfIn PDF document text
    • http://files.promechservices.co.uk/uploads/1/3/0/7/130739419/7aad746b2.pdfIn PDF document text
    • http://files.detonchoenvironmental.com/uploads/1/3/0/7/130740087/kudikirekikakoz_vexabakow.pdfIn PDF document text
    • http://ligaw.lwaracing.com/uploads/1/3/1/4/131454029/72a93defc.pdfIn PDF document text
    • http://jatizu.josefjakobs.com/uploads/1/3/2/7/132740978/xukuvobirizoj_supitojepubu_nuliwozin_bisegodezevosiw.pdfIn PDF document text
    • http://pakob.deathandseparationbook.com/uploads/1/3/0/9/130969198/97aa5d1e76.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off00009b5f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9B5F 5440 bytes
SHA-256: 68980b4675d3ec387264eacfd1b7a5eae83e2dc1183e9e5b14599d6a9eec50f8
font_01_sfnt_off0000adf3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xADF3 13696 bytes
SHA-256: 73dc0a5777a40d4829e52914296df7e1c54b01d6ab1f8f5579e7fee27c005b02

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