Malicious PDF — malware analysis report

Static analysis result for SHA-256 fcf2a83e67ad8e7f…

MALICIOUS

PDF

43.5 KB Created: 2020-11-09 16:00:57 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-31
MD5: 8152fa2f1c9e9cf3fb1f937f53f1dd02 SHA-1: ba588635fff33114b04986e6d537be6a22ce1121 SHA-256: fcf2a83e67ad8e7f2424e461fb16be6c9e877453c19e228a249dead18f6bf67d
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 User Execution: Malicious Link

The PDF contains a large number of external links, many of which are to other PDF files, suggesting a link farm or SEO poisoning tactic. The embedded document body text, while partially corrupted, includes a URL that mimics a search result, further supporting this attack pattern. No scripts were extracted, and the primary malicious activity appears to be directing users to potentially malicious or unwanted content via numerous embedded URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 4

  • 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.
  • 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://trafftec.ru/aws?keyword=brighton+high+school+football+schedule+2019 PDF link annotation
    • https://weposatozexutav.weebly.com/uploads/1/3/4/3/134314203/rudafejujeved-xaxidez-detixumuzu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375696/normal_5f96696a57f24.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366045/normal_5f9d2bbcaea93.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369504/normal_5f8b61022db3f.pdfIn PDF document text
    • https://risimukino.weebly.com/uploads/1/3/1/3/131383953/dalud.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4401711/normal_5f9b01b356735.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4451220/normal_5fa012dce27b9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383913/normal_5f90d50b18199.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408990/normal_5f9aac05a7d5e.pdfIn PDF document text
    • https://posalezonekat.weebly.com/uploads/1/3/4/6/134628665/siwefoloralixi-dopuje-gubizasif-vazunizu.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/retisovojor/busafaxajamasopigoti.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a5763eb5-fc39-4501-a4ba-d486f4954cf4/21390052502.pdfIn PDF document text
    • https://s3.amazonaws.com/pewibim/gilegibux.pdfIn PDF document text
    • https://s3.amazonaws.com/gonuxiwela/lamb_to_the_slaughter_worksheets_and_answers.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_off00006a64.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6A64 5956 bytes
SHA-256: 959a865072d32a89cd89241797c2b8e78a1e6dd9ba3ec79d5dd255930feb6fb4
font_01_sfnt_off00007ea9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7EA9 10096 bytes
SHA-256: 96794f51271817ec631440b4ff98f90d58127f91f571fdbb44b355835c5108bd

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