Malicious PDF — malware analysis report

Static analysis result for SHA-256 e8a9ec29b1eec9f4…

MALICIOUS

PDF

82.8 KB Created: 2021-05-29 19:42:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: 561aac00b09bfdb0e39c1c0051fa3e59 SHA-1: 792a5ab278abd0f5ca986962604dd8fbb30be4a2 SHA-256: e8a9ec29b1eec9f412c90d9e30af86be80cf925582511b3c37d0eaea14ebe808
226 Risk Score

Malware Insights

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

This PDF document employs a social engineering lure, instructing the user to install a browser extension or update to view content. It contains a large number of external links, many hosted on disposable domains, suggesting a link farm designed to distribute malicious content or phish for credentials. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

Heuristics 7

  • 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 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.
  • Browser extension / update installation lure high SE_BROWSER_INSTALL_LURE
    Document tells the user to install a browser extension, plugin, viewer, or browser update to view content — a common social-engineering path for credential theft and malware installation
  • 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://soxebez.ru/strik?utm_term=how+to+write+a+three+column+cash+book PDF link annotation
    • https://womonejod.weebly.com/uploads/1/3/2/6/132681039/xevigerasow.pdfIn PDF document text
    • https://nivozigagu.weebly.com/uploads/1/3/4/4/134439663/7182322.pdfIn PDF document text
    • https://bitivomo.weebly.com/uploads/1/3/4/4/134478942/04839c53c2.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4413109/normal_5fce0be996567.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4451035/normal_603947f463b12.pdfIn PDF document text
    • https://static.s123-cdn-static-d.com/uploads/4470409/normal_60b0862361ecb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4482018/normal_605df5684b7f8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4376369/normal_60166607dfd37.pdfIn PDF document text
    • https://vukegodepobaxi.weebly.com/uploads/1/3/4/6/134676750/11a5a7439c4ed.pdfIn PDF document text
    • https://xedaliwim.weebly.com/uploads/1/3/1/4/131454603/f0a5ef6298.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4376103/normal_5ff17bde9f4b9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4446275/normal_602285ee68fb1.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4386347/normal_5ff8c70961cb5.pdfIn PDF document text
    • https://milafesubori.weebly.com/uploads/1/3/4/7/134745217/xaxesamidorelotupado.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4443326/normal_5ff8d9c6e4ab6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4427498/normal_605b5e1933642.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4500895/normal_5fd7e671c6f14.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366347/normal_60662e3735768.pdfIn PDF document text
    • https://mizefowoxeze.weebly.com/uploads/1/3/4/4/134485365/6693222.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4482853/normal_6056c3e6285bc.pdfIn PDF document text
    • https://ruwagifixub.weebly.com/uploads/1/3/4/0/134013037/penaniwat_zukumudaberix_jisak_nomusizal.pdfIn PDF document text
    • https://vupimolafi.weebly.com/uploads/1/3/1/3/131398504/9251524.pdfIn PDF document text
    • https://xororawezajeber.weebly.com/uploads/1/3/5/3/135338150/0f24fb62586.pdfIn PDF document text
    • https://favekenada.weebly.com/uploads/1/3/0/8/130874403/fekivug-zeduw-fepevuvijegus.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4474720/normal_60405bf48a597.pdfIn PDF document text
    • https://kexiwiwimibip.weebly.com/uploads/1/3/1/3/131379584/vugijaku-wajuvufazoje-lotun-wofojasogos.pdfIn PDF document text
    • https://mixutexevegov.weebly.com/uploads/1/3/4/7/134706804/dareboludoluziwir.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_off00010463.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10463 5296 bytes
SHA-256: f2b6a8d94e637648f39c36c1a19bfb7887b946aabf4704282401819d3dbb646a
font_01_sfnt_off0001164a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1164A 11192 bytes
SHA-256: 02dd63f16f105be5f29430044aafd092d96eac48fd5d1d66cea495dead403e4f