Malicious PDF — malware analysis report

Static analysis result for SHA-256 b521954da513facf…

MALICIOUS

PDF

74.3 KB Created: 2021-02-03 21:13:27 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-06-05
MD5: 7f68084f5d1d704caacb1c274b4509d1 SHA-1: 6e38776c61a4dfa047d56cf31d1425db7a602bfc SHA-256: b521954da513facf87dc2e487486d380efaa5a8cae8b887943d0aeb3e32eedd2
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file contains a large number of external links, many pointing to disposable domains and Weebly subdomains, indicating a link farm or phishing lure. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and heuristics point towards techniques used to redirect users to malicious sites.

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://jottigo.ru/123?utm_term=the+ffa+creed+was+written+by PDF link annotation
    • http://astrology-personal.online/mukewey981.pdfIn PDF document text
    • https://wikefazopikevi.weebly.com/uploads/1/3/4/7/134715570/xumasuvutilenux.pdfIn PDF document text
    • https://cdn.sqhk.co/duzoxibuf/eheFibV/clash_of_clans_hack_free_coc_gems.pdfIn PDF document text
    • https://cdn.sqhk.co/tuxarulenogu/ijuR8ig/32432144919.pdfIn PDF document text
    • https://xozilawowoxov.weebly.com/uploads/1/3/4/7/134704750/derutagasifijigu.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4370054/normal_5fcd229111c12.pdfIn PDF document text
    • https://wawodupalise.weebly.com/uploads/1/3/4/6/134621762/fafonuwedox.pdfIn PDF document text
    • https://jexafowasefuxuv.weebly.com/uploads/1/3/4/5/134588667/nufefudodepanik.pdfIn PDF document text
    • https://cdn.sqhk.co/fenazijeguk/im3OTjf/48121611940.pdfIn PDF document text
    • https://mojabizozawobe.weebly.com/uploads/1/3/4/6/134699592/825ad4e4.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4373297/normal_5fe44fe0bf8e5.pdfIn PDF document text
    • https://noduxulab.weebly.com/uploads/1/3/4/9/134901810/tegid_bipefiwaneta.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413573/normal_5fe84e10c2835.pdfIn PDF document text
    • https://cdn.sqhk.co/wabajevebe/h9PLjfH/sales_pulse_tutor_login.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_off0000e59e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE59E 5360 bytes
SHA-256: 6ea99d861f4f889b4b1715ab78c62fc3c6eac8714d5e308d94eba893c8a2d167
font_01_sfnt_off0000f7eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7EB 10536 bytes
SHA-256: 1df359709bcbd248742502052f9ea256e501ef8d33283519ad8cc7fbe4b2356f

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