Malicious PDF — malware analysis report

Static analysis result for SHA-256 b7cd199d145f9320…

MALICIOUS

PDF

80.7 KB Created: 2021-06-01 06:17:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-10
MD5: 70cd43169073ef5a21ee70a88e8640f8 SHA-1: fea7adcb555452d10713411fea33ef1798e97f3c SHA-256: b7cd199d145f9320c3c79bc1aacab5b3e4ac75af3b038a3e7750885b66f57394
126 Risk Score

Malware Insights

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

This PDF document contains a large number of external links, many hosted on disposable domains, suggesting a link farm or SEO manipulation tactic. The embedded URL 'https://krisoc.ru/pbw?utm_term=how+many+amps+does+a+mig+welder+draw' is presented as a search result, likely to deceive users into clicking. While no scripts were directly extracted, the PDF structure and extensive link farm heuristic indicate a malicious intent to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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.
  • 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.
  • 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://krisoc.ru/pbw?utm_term=how+many+amps+does+a+mig+welder+draw PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4421062/normal_601eb2bd0d4a8.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4425926/normal_5fc5e888be968.pdfIn PDF document text
    • https://rigavimiba.weebly.com/uploads/1/3/0/8/130814992/452878.pdfIn PDF document text
    • https://fusemikak.weebly.com/uploads/1/3/4/6/134649426/vodij_popidosi.pdfIn PDF document text
    • https://zenamuvevabun.weebly.com/uploads/1/3/1/4/131453902/3063719.pdfIn PDF document text
    • https://xeromikivato.weebly.com/uploads/1/3/2/6/132695960/539144.pdfIn PDF document text
    • https://mubelumovetofap.weebly.com/uploads/1/3/1/8/131856402/sewaparuwovuk_dazape_ribuwafi_pipuborutegok.pdfIn PDF document text
    • https://dunewalowipeli.weebly.com/uploads/1/3/1/8/131856746/nuwoz.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://siruzosu.pbworks.com/f/silapepaxuj.pdfIn PDF document text
    • http://wuwazilizos.pbworks.com/w/file/fetch/144424389/bosch_ts3000_specs.pdfIn PDF document text
    • http://negovijalulu.pbworks.com/w/file/fetch/144426408/96350385726.pdfIn PDF document text
    • http://kolasotosexu.pbworks.com/w/file/fetch/144413559/27295611233.pdfIn PDF document text
    • http://sodopateduke.pbworks.com/f/69204089220.pdfIn PDF document text
    • http://bupataved.pbworks.com/w/file/fetch/144427617/pederiwexogesifinogases.pdfIn PDF document text
    • http://mefijunov.pbworks.com/w/file/fetch/144420576/toddler_cape_coat_pattern.pdfIn PDF document text
    • http://wuranosa.pbworks.com/f/26263625539.pdfIn PDF document text
    • http://xujefix.pbworks.com/f/31831124622.pdfIn PDF document text
    • http://lugozamuxika.pbworks.com/w/file/fetch/144414483/economa_bsica_rodas_carpizo_descargar.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_off0000fc29.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC29 5436 bytes
SHA-256: df68772f2f585310d90f8d4778415766a570fd4b0f37266a52a88190d991bed4
font_01_sfnt_off00010ea2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10EA2 11540 bytes
SHA-256: d0694fe2a341a0dc0f0fcd580073e86e3bc537b0af421dc8ea4b5c8d9e402582

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