Malicious PDF — malware analysis report

Static analysis result for SHA-256 cd1ad608892d8ec9…

MALICIOUS

PDF

78.8 KB Created: 2021-02-25 05:58:45 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-06-04
MD5: c43ca986df3c594d5f691d2db9634bd5 SHA-1: e051f46b1d8130d1304b537454e7b60034051726 SHA-256: cd1ad608892d8ec9ea1d677137c28b7381125dd7d3772e1d6066e68a07d1296c
136 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. It contains a lure related to 'numeros racionales ejemplos' and redirects to the URL https://jacksth.ru/wix?keyword=numeros+racionales+ejemplos, indicating a phishing or malware distribution attempt. The presence of embedded URLs and the nature of the heuristics suggest it is designed to trick users into visiting a malicious site.

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
  • Image lure linking to an SEO redirector (free-download phishing) high PDF_SEO_UTM_REDIRECTOR_LINK
    PDF embeds an image with little or no body text and a clickable link to a multi-word utm_term / FeedBurner-proxied SEO redirector — the 'free ebook / solution-manual / document download' phishing family that ranks for natural-language search queries and routes the user into a payload/redirect chain. The PDF carries no exploit; the risk is the linked destination. Flagged structurally (image lure + SEO redirector) so it does not depend on a ClamAV/ML signature, and regardless of how many filler text pages the lure carries.
  • 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://jacksth.ru/wix?keyword=numeros+racionales+ejemplos PDF link annotation
    • http://xepidenad.scienceontheweb.net/vefepezekafo.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4455659/normal_600f44bd1fc53.pdfIn PDF document text
    • https://cdn.sqhk.co/wavudasawete/FWIcjfT/57160904575.pdfIn PDF document text
    • http://vitofemegawe.getenjoyment.net/tijanesutul.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4473388/normal_5feef8001c40f.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4479235/normal_5fe2c71757ea4.pdfIn PDF document text
    • http://rubewox.sportsontheweb.net/81365637323.pdfIn PDF document text
    • http://specialsale.info/metrics_and_measurement_worksheet_answers_key_chemistryj1zlh.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4493550/normal_60187d3728c82.pdfIn PDF document text
    • https://cdn.sqhk.co/malofavu/idKid6t/60302772325.pdfIn PDF document text
    • https://cdn.sqhk.co/kekelivig/9hQBibj/2020_election_oddschecker.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4425723/normal_601576b3086c4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4495043/normal_60134eaf15e61.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

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_off0000f4b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4B4 5124 bytes
SHA-256: 23b9e69bcdd71ef8983635570bddb31c5a74311e79d9e0fb61ac51f8d9d50ef4
font_01_sfnt_off00010613.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10613 11844 bytes
SHA-256: fc551345eb0b7e43bc24a50c38ea2cc1c50b4122c5c07c832645dbc9463484a6

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