Malicious PDF — malware analysis report

Static analysis result for SHA-256 0a84ed1d2478614f…

MALICIOUS

PDF

81.5 KB Created: 2021-05-15 09:58:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: 7b7ca117783af8775a410eeec0dedf08 SHA-1: e6dbbcdfdcabc9e4c9a951e69a4c36f434130d0c SHA-256: 0a84ed1d2478614f2ea50220620c67e75dbaf8337c5cab1c557699fdbee03ef9
186 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 poisoning tactic. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. The embedded URLs are the primary indicators of compromise, directing users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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.
  • 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://vilenefex.ru/strik?utm_term=tipos+de+fichas+bibliogr%25C3%25A1ficas+ejemplos PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4461484/normal_601be4560de2d.pdfIn PDF document text
    • https://boraweterepin.weebly.com/uploads/1/3/4/8/134864111/5580450.pdfIn PDF document text
    • https://ralugegab.weebly.com/uploads/1/3/4/8/134888835/zokuv-buvawa-dunurowumuf.pdfIn PDF document text
    • https://tozakewa.weebly.com/uploads/1/3/5/3/135398337/puririjadituma.pdfIn PDF document text
    • https://nevomunetis.weebly.com/uploads/1/3/0/7/130740414/wadozebosajonus.pdfIn PDF document text
    • https://zofigaxukinepir.weebly.com/uploads/1/3/4/2/134235574/laloxojofamo_rutudojuf.pdfIn PDF document text
    • https://jixawapideraje.weebly.com/uploads/1/3/3/9/133997308/7778967.pdfIn PDF document text
    • https://jejepijukutu.weebly.com/uploads/1/3/4/1/134131362/gasulip.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4495841/normal_603ffe93a5a73.pdfIn PDF document text
    • https://sevakozo.weebly.com/uploads/1/3/4/6/134677934/nakasamadat-gorilepi-xinidovi-xosadanosobuzev.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://nupowabel.rf.gd/indices_questions_gcse_worksheet.pdfIn PDF document text
    • https://329f26c8-0235-4118-8622-173d264d9cf1.filesusr.com/ugd/221f3a_2223980417af4bcfbd8ba43587b209f5.pdf?index=trueIn PDF document text
    • http://wogekipa.rf.gd/jurnal_carica_papaya.pdfIn PDF document text
    • https://9e269ae7-c3cf-4b9f-bde2-1d9be064b7bf.filesusr.com/ugd/139869_a48e693d846b4632bb92b76d6042c37a.pdf?index=trueIn PDF document text
    • https://71da2aa5-51c3-4f2c-ab18-08bbbad20131.filesusr.com/ugd/d216cb_de7d7d9e60604229aa8c8c8aaa7f7f6d.pdf?index=trueIn PDF document text
    • http://sekijipaladi.epizy.com/xezataloxizuzituruxu.pdfIn PDF document text
    • https://4e33067b-0f13-4bed-bb9c-ea95f768fd7c.filesusr.com/ugd/23924c_9bd6368dea9444c0967bc8104244124c.pdf?index=trueIn PDF document text
    • https://59b7e61f-9850-45ee-add2-e9646db267e4.filesusr.com/ugd/5b9365_3d5716ba159d4fc7bdd2059973dd3982.pdf?index=trueIn 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_off0000fb0d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB0D 5968 bytes
SHA-256: d480c982334aea55a46428d3b3382dc0fa1420036cc0e0ab3d3a184f416cd2b8
font_01_sfnt_off00010ead.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10EAD 12440 bytes
SHA-256: aa114eade2188f9fa7f84f5544580e061adcfb06bbdd4d69ed2140e38ad9b157

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