Malicious PDF — malware analysis report

Static analysis result for SHA-256 022bd2f919fbeb88…

MALICIOUS

PDF

71.4 KB Created: 2021-03-28 22:25:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-16
MD5: d6c961aba5a1b5381b16af846e837956 SHA-1: 8e2bd3eea37b3141897bcbcf3a41ad7a22a369b6 SHA-256: 022bd2f919fbeb884b349f08b026aa51c79f457568c1b8a5ced62c3b1d2eca34
126 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by multiple heuristics and an ML classifier. It contains numerous external URIs, with a primary focus on a link farm hosted on disposable domains, suggesting a phishing or malware distribution attempt. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic indicates a deliberate attempt to create a large number of links on low-reputation hosting. No scripts were extracted, but the presence of external links and the overall structure strongly suggest an intent to redirect users to malicious content.

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://kuzutuzo.ru/wix?keyword=applebloom+and+applejack PDF link annotation
    • https://pewewikivu.weebly.com/uploads/1/3/5/3/135302390/sulasasutavazuxu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4459034/normal_6041911a17089.pdfIn PDF document text
    • https://kenilajapa.weebly.com/uploads/1/3/1/0/131069910/makoxibizuzezupimudo.pdfIn PDF document text
    • https://dabekigojevuj.weebly.com/uploads/1/3/4/6/134636423/3632684.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4387703/normal_5fc75c1b41a53.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367631/normal_604425e71960c.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4470038/normal_5fcb54269a522.pdfIn PDF document text
    • https://sowidokobixu.weebly.com/uploads/1/3/1/8/131856306/b8f052c0e03d634.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4499005/normal_600b1d3b539a7.pdfIn PDF document text
    • http://pometukiwalevu.22web.org/rurasoporanutebi.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4444626/normal_5fe41df714e13.pdfIn PDF document text
    • https://sozivawar.weebly.com/uploads/1/3/4/5/134511290/jilomagugomapa.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/fejenijovekozu/empire_college_school_of_law_model_answers.pdfIn PDF document text
    • http://muvelexadaw.epizy.com/troy_bilt_tb230_190cc_lawn_mower.pdfIn PDF document text
    • https://s3.amazonaws.com/zumezeviwakiz/72307081138.pdfIn PDF document text
    • http://votaxikotoris.epizy.com/tablas_matematicas_de_arquimedes_caballero_para_descargar.pdfIn PDF document text
    • https://s3.amazonaws.com/gazitif/zubirorulukedasusexoxu.pdfIn PDF document text
    • http://kazoverowagodi.epizy.com/kozikir.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_off0000dc82.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC82 5212 bytes
SHA-256: 5897c554b7b836978518769b52ddc0280970ff06f8aa809224f0ed09dcdbb725
font_01_sfnt_off0000ee2c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE2C 10072 bytes
SHA-256: f34d6dc0dab6f4b9b1f25770e8d48298bd0c908249cca3bec7fed10bb4054bfc

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