Malicious PDF — malware analysis report

Static analysis result for SHA-256 87ca5c5f812f1259…

MALICIOUS

PDF

76.8 KB Created: 2021-02-25 01:26:50 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-06-05
MD5: 1679cdc7ae48c7f5ad89e3b6723706fb SHA-1: 0123066f43f70a8fc7b61a7f8bfcec1534677cd0 SHA-256: 87ca5c5f812f1259375d356d9bc6e08494eb1985cfc931d03fb986f869c5ba71
244 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains a large number of embedded links, many pointing to disposable domains and some leading to known malicious redirectors. This behavior is indicative of a phishing or scam campaign designed to lead users to malicious sites. The ML classifier and ClamAV detection strongly support the malicious verdict.

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://crophysi.ru/123?utm_term=nieve+de+garrafa+en+ingles In PDF document text
    • https://lanasasaf.weebly.com/uploads/1/3/0/8/130815311/kurena-togapex.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369327/normal_6027a6ec65ca4.pdfIn PDF document text
    • https://poxigupi.weebly.com/uploads/1/3/1/3/131398264/330427.pdfIn PDF document text
    • https://nagilozumovamag.weebly.com/uploads/1/3/4/3/134317868/9113474.pdfIn PDF document text
    • https://wukarogokemek.weebly.com/uploads/1/3/0/7/130739107/bupar.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4445531/normal_5ff763a374cc8.pdfIn PDF document text
    • https://sobomevoza.weebly.com/uploads/1/3/0/7/130739746/jekovabuponulu.pdfIn PDF document text
    • https://nuguzawopaji.weebly.com/uploads/1/3/4/0/134040365/5622468.pdfIn PDF document text
    • https://cdn.sqhk.co/mogizilo/olciaig/the_crossing_church_denver.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369333/normal_5fdc17048683c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4418987/normal_5fd5fa98ba04c.pdfIn PDF document text
    • https://nizerekudoni.weebly.com/uploads/1/3/5/3/135383630/fekamomefafox-nabovipexi-netuvarikewerox.pdfIn PDF document text
    • https://gawobomune.weebly.com/uploads/1/3/5/3/135317514/vimesok.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://jatomije.rf.gd/project_cost_tracking_spreadsheet_excel.pdfIn PDF document text
    • http://zozadugaweguj.epizy.com/25902377003.pdfIn PDF document text
    • http://kateporabub.epizy.com/richland_township_michigan_zoning_ordinance.pdfIn PDF document text
    • http://nisijavifusepov.epizy.com/resident_evil_2_bosses_guide.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_off0000eab7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAB7 5104 bytes
SHA-256: 5e1ec1b519a51c55fc39b0b6c9baed2e5cd08969d1cd97912a3e4f82f1ea2ddf
font_01_sfnt_off0000fc35.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC35 12388 bytes
SHA-256: f48bf685b285e4b275953001a0c466bdcadaed8dd8e10752f3192d665c45b690

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