Malicious PDF — malware analysis report

Static analysis result for SHA-256 b8f5521ab3b434f5…

MALICIOUS

PDF

80.5 KB Created: 2021-02-25 02:11:24 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: a6dcdc499dc27a798b5ad14e36c4714b SHA-1: 33297939b42ba459c1e7d3a8d6d9e2a0a860cef7 SHA-256: b8f5521ab3b434f5f4e4acccede8d96e389ee7227fe82482f60c347db5f6915b
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to disposable domains, and is flagged by heuristics as a link farm designed for SEO manipulation. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. Although no scripts were extracted, the presence of many external links suggests the document's primary purpose is to redirect the user to a malicious site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://bologen.ru/strik?utm_term=a+fine+fine+school+book+summary PDF link annotation
    • http://opsnatur.fun/20089802594czik5.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4413346/normal_5ff25ffa4ac99.pdfIn PDF document text
    • http://wikuseweluwi.iblogger.org/14086682139.pdfIn PDF document text
    • http://avtoshkola-region26.ru/tesojolokaradadixivcf66p.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4383460/normal_60036e7940981.pdfIn PDF document text
    • http://piwudev.iblogger.org/gene_therapy_for_inherited_disorders.pdfIn PDF document text
    • https://tivofexogi.weebly.com/uploads/1/3/1/3/131398075/kulojagubiz.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4475391/normal_60222f62a817e.pdfIn PDF document text
    • https://kobamaputoruv.weebly.com/uploads/1/3/1/4/131409310/1769469.pdfIn PDF document text
    • https://dexuganepo.weebly.com/uploads/1/3/1/6/131608037/c1813.pdfIn PDF document text
    • http://jupowawixiz.iblogger.org/oxford_handbook_of_clinical_pharmacy.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4446016/normal_5feb55a3e8930.pdfIn PDF document text
    • http://fufumizajo.22web.org/marriage_certificate_form_mp.pdfIn PDF document text
    • https://lujogisuz.weebly.com/uploads/1/3/4/9/134904514/2a307511f4128.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/jesidofefe/nerijovodikas.pdfIn PDF document text
    • https://s3.amazonaws.com/fejakixoweka/words_of_wisdom_for_new_parents_funny.pdfIn PDF document text
    • https://s3.amazonaws.com/fatikonavori/muxupuferuwupojirusoxeg.pdfIn PDF document text
    • http://banigigafizaje.epizy.com/17525739038.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_off0000fe2d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE2D 5416 bytes
SHA-256: cd07bd601979e78c99fd970b8937a0c5a78edfaf1defd18fcc1c9301170773d4
font_01_sfnt_off0001107c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1107C 10872 bytes
SHA-256: 03ff2c487508eb827931447f7861aeda2142cbaffc7e92717b52340f5c2fa49d

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