Malicious PDF — malware analysis report

Static analysis result for SHA-256 cd4776d586aa7b5c…

MALICIOUS

PDF

75.0 KB Created: 2021-02-27 12:13:35 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-06-04
MD5: 790b365345d20e6f960ea5013940a4eb SHA-1: 73bf4202860a66ad7d840dcee43c1badaea17430 SHA-256: cd4776d586aa7b5cc9f132f2ce3d1fc7009eb8029f95e1ada0464cbe211521b1
184 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 as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, with at least one identified as a malicious redirector pointing to 'https://dafemum.ru/123?utm_term=martin+luther+king+speech+youtube+full'. The document body, though heavily obfuscated, suggests a lure related to search terms, likely to drive traffic to these malicious sites.

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
  • 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 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://dafemum.ru/123?utm_term=martin+luther+king+speech+youtube+full In PDF document text
    • http://firstreadersclub.com/cv_template_for_university_teaching_assistant52mop.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4500667/normal_5fe427e27820f.pdfIn PDF document text
    • http://shoop-fg.ru/hamilton_beach_flexbrew_replacement_carafe_49983iqrb1.pdfIn PDF document text
    • https://cdn.sqhk.co/bofozuto/gpjevEm/56140572989.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4500200/normal_5ff622eea977d.pdfIn PDF document text
    • http://gipogup.sportsontheweb.net/64227671977.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4495681/normal_6027cc459b00d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4476142/normal_6035bfd250d22.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4388060/normal_601061f3a5d8c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4458394/normal_6017099dbd218.pdfIn PDF document text
    • http://artrosil.xyz/58098575113tm65g.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4445555/normal_6027cc0822a0d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4459621/normal_601b014808892.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4381539/normal_601596b6e4247.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://faleferesevo.onlinewebshop.net/96886546465.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e7b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7B5 5588 bytes
SHA-256: 62f0d5aab47b6eb603aa3a4ebf62b929f4dfb0fe348eca957229627e0486d778
font_01_sfnt_off0000fac5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAC5 10412 bytes
SHA-256: 54739812173c6daf06a6efd9a92487636f2d564ccc2488402a7ee46981d6b9c4

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