Malicious PDF — malware analysis report

Static analysis result for SHA-256 77eaee89bdef5f26…

MALICIOUS

PDF

75.5 KB Created: 2021-04-07 19:14:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-25
MD5: 61b7a6dc6bee166e86e994b602f7e038 SHA-1: d52dfc35a36b60dd08826f0bbcfad1d1b3e4475b SHA-256: 77eaee89bdef5f26625da1367f28304a64c3eac809ed5c29a7520bf68426e312
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. It contains a large number of external links, many pointing to disposable domains, suggesting a link farm or redirection scheme. While no scripts were explicitly extracted, the presence of numerous external URLs and the overall structure strongly indicate an attempt to lure users to malicious content, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://bologen.ru/strik?utm_term=how+to+draw+anime+boy+face+naruto PDF link annotation
    • http://carinsusa.info/spectrum_math_workbook_grade_8_free92cvz.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4479705/normal_606c181d0cd5f.pdfIn PDF document text
    • https://rarozevalir.weebly.com/uploads/1/3/1/4/131437937/2689993.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4445103/normal_6056e49438881.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369164/normal_603b71d6c6fcd.pdfIn PDF document text
    • https://banepopewux.weebly.com/uploads/1/3/4/2/134234854/4401674.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4501356/normal_600fb11a3302a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374521/normal_6018a32293e4c.pdfIn PDF document text
    • https://maladekokox.weebly.com/uploads/1/3/4/7/134745457/637661.pdfIn PDF document text
    • https://busaluvugisegiw.weebly.com/uploads/1/3/4/3/134368440/vupakuzogapinodebe.pdfIn PDF document text
    • http://opensoda.pro/calculer_tva_sur_ttc_formuley3ivh.pdfIn PDF document text
    • http://fasad-dom.site/what_is_heat_of_solution_simple_definitiona4wzt.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4407301/normal_604d263ce6f9c.pdfIn PDF document text
    • http://indital.space/marketing_management_by_philip_kotler_2020wbh4s.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4481985/normal_600172301b06b.pdfIn PDF document text
    • http://reduslimitalia-ufficiale.site/pekuwozefafagjqguq.pdfIn PDF document text
    • http://lnstagramverificationbadge.com/talking_tom_candy_run46swg.pdfIn PDF document text
    • http://capridigi.com/157169049714ga8u.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454809/normal_601921b52c676.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_off0000e869.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE869 5252 bytes
SHA-256: 967e583f3495bdacd6b7b2f28fdae075bfc45441bfafbbde589939f5f553cde3
font_01_sfnt_off0000fa49.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA49 11048 bytes
SHA-256: 32143de83c237811467291dbb48c127a2906e19ea711204ad7e64d47ec398700

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