Malicious PDF — malware analysis report

Static analysis result for SHA-256 c1a73a9a2ec4e04c…

MALICIOUS

PDF

82.7 KB Created: 2021-03-17 06:10:25 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-17
MD5: 71b34d3fd0e158c9628552362e2803eb SHA-1: 15add9ea5e51415fcd61391ce9378627719666a8 SHA-256: c1a73a9a2ec4e04c095eafdcc8a5648caf0a9f474dc9345f004e303442c9a611
156 Risk Score

Malware Insights

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

This PDF was flagged by multiple heuristics, including ClamAV and an ML classifier, indicating malicious intent. It contains a large number of external links, a common tactic for SEO manipulation or directing users to phishing sites. The presence of embedded URLs and the PDF_SEO_LINK_FARM heuristic strongly suggest this is a malicious link farm.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://seumenha.ru/strik?utm_term=yamaha+mg16xu+16-channel+mixer+dimensions PDF link annotation
    • http://kittyplay.online/you_cant_name_a_single_thing_in_this_photozt4es.pdfIn PDF document text
    • http://winoraama.fun/8th_grade_go_math_book_answers7wsu0.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4454990/normal_5fe0044e0d36f.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4375908/normal_5ff7a9ef5585c.pdfIn PDF document text
    • http://sneakerspapa.store/important_maxims_of_lawnomsl.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4381529/normal_5fee7dd7398d9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368969/normal_600f1edd59646.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/zebarufuridorur/83447742329.pdfIn PDF document text
    • https://s3.amazonaws.com/jedadokuti/xexovugidaguleweri.pdfIn PDF document text
    • https://ea64ff4c-51e6-4efc-8cc1-399682447901.filesusr.com/ugd/961f18_1cbb3b4b553943deb13ecbebc3af0895.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/gapuruxumeg/zefup.pdfIn PDF document text
    • https://s3.amazonaws.com/firigugixujotov/66483835990.pdfIn PDF document text
    • https://s3.amazonaws.com/fasomusogapovi/81486647004.pdfIn PDF document text
    • https://s3.amazonaws.com/liwafo/example_finance_board_report.pdfIn PDF document text
    • https://s3.amazonaws.com/pilazi/67356276112.pdfIn PDF document text
    • https://s3.amazonaws.com/dewutexorob/battle_of_hastings_timeline_worksheet.pdfIn PDF document text
    • https://2a082fd4-e93f-4b8e-9e59-408fa046b31c.filesusr.com/ugd/e334dd_0627493ee00f478d9d68603a3696ad9a.pdf?index=trueIn PDF document text
    • https://488a161d-122f-4e25-b35e-34d1d0e27b34.filesusr.com/ugd/bbc910_54281748500f4ae88a79fb17106ca352.pdf?index=trueIn PDF document text
    • https://3dcfbd4a-ef33-49dc-a04a-0aaf5307c30d.filesusr.com/ugd/b47706_445ebef7223547daa324d28e50150be9.pdf?index=trueIn PDF document text
    • https://9db8f275-5044-409a-aa1b-3306d9dda9bd.filesusr.com/ugd/361f4b_c4a73e4b4fdc44c89d23d53c2665d8d4.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/ninasivol/despacito_free_piano_sheet_music.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_off0001015c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1015C 5620 bytes
SHA-256: fa5dacfe939fcfda66189f3b98e513c6cbaaf34fac2d097714a63d378155641e
font_01_sfnt_off00011462.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11462 11980 bytes
SHA-256: 5564fb26ab45377572b4b27f8d274b730e72cdbc39f39de0250dc6037971cdb9

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