Malicious PDF — malware analysis report

Static analysis result for SHA-256 3f5a263b981c4889…

MALICIOUS

PDF

73.0 KB Created: 2021-02-23 21:32:22 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-06-05
MD5: dd62696744a67780b19d64e24c2c4862 SHA-1: f9f6ab936dd9b14dcee730906fe62e395ca64f6f SHA-256: 3f5a263b981c4889054b870634fc7666b669759e873f342bc1f66475b8338ade
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a phishing attempt. It contains numerous external links, many hosted on disposable domains, suggesting a link farm designed to redirect users to malicious sites. The embedded URLs and the heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly indicate a phishing campaign aiming to trick users into visiting compromised websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://baarspo.ru/123?utm_term=how+big+is+a+7+cubic+foot+refrigerator PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4481518/normal_5ffb6c0081543.pdfIn PDF document text
    • http://reduslim-italiaufficiale.site/for_freedom_s_sake_summarymf3tl.pdfIn PDF document text
    • http://d2-club.ru/jukozovezusofumiwrp0j5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4425492/normal_601198bc46f7d.pdfIn PDF document text
    • http://alkostore.xyz/943365957016yvfe.pdfIn PDF document text
    • http://xapakemulu.22web.org/rerezobebepu.pdfIn PDF document text
    • https://noxerurivago.weebly.com/uploads/1/3/4/7/134767941/a69558b9e4e3a1d.pdfIn PDF document text
    • https://gekafokolasiga.weebly.com/uploads/1/3/1/3/131384301/4568606.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4406501/normal_5fdb31bb72b71.pdfIn PDF document text
    • http://zigorukap.iblogger.org/72336482513.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4477376/normal_5fd1ff0c38f65.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://zikenonuto.epizy.com/3047883990.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d4bb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4BB 5064 bytes
SHA-256: ab5b946706d4517b24963a6a7f609005bbe1f5503cb59191c8f79d02cc9a1c2d
font_01_sfnt_off0000e628.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE628 10228 bytes
SHA-256: 84cc01b98873f40970565501514664d080df6b9fb9df0116747097a94686a060
font_02_sfnt_off00010926.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10926 4324 bytes
SHA-256: 0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333

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