Malicious PDF — malware analysis report

Static analysis result for SHA-256 6cd353809e69b8a4…

MALICIOUS

PDF

84.2 KB Created: 2021-02-27 17:34:15 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-06-05
MD5: 84b002d49a31b4bb0274f0b10fc75e25 SHA-1: aeb5a65dbf97e3aa078e08ded3edf0d75cbb0855 SHA-256: 6cd353809e69b8a41d70a76611b975492f2a82764c9659193e7c80aa1c8f1ad7
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains a significant number of external links, many pointing to disposable domains, indicating a link farm or phishing operation. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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 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://kuzutuzo.ru/strik?utm_term=descartes+second+meditation+questions PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4468572/normal_600e65bf0f052.pdfIn PDF document text
    • https://cdn.sqhk.co/pogezasamu/f8jfYjj/41467684950.pdfIn PDF document text
    • https://cdn.sqhk.co/velabolo/jRlvgim/ludonikepebe.pdfIn PDF document text
    • https://cdn.sqhk.co/jemitaso/ia9jfjc/clash_of_clans_hack_mod_apk_download_link.pdfIn PDF document text
    • https://wolixakeju.weebly.com/uploads/1/3/6/0/136002716/456133.pdfIn PDF document text
    • http://roborezi.iblogger.org/75496379095.pdfIn PDF document text
    • http://sijuvibitita.iblogger.org/would_in_a_sentence_for_kindergarten.pdfIn PDF document text
    • https://zisidolig.weebly.com/uploads/1/3/1/3/131379992/tulukawap_fomuzepis.pdfIn PDF document text
    • https://cdn.sqhk.co/pubamegumox/jchgqjj/farming_jobs_in_nebraska.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://lamerowed.rf.gd/29902449954.pdfIn PDF document text
    • http://buwanizun.epizy.com/calibre_ebook_portable.pdfIn PDF document text
    • https://s3.amazonaws.com/wovugi/bharatiya_janata_party_application_form.pdfIn PDF document text
    • http://rupilozomu.epizy.com/86111948818.pdfIn PDF document text
    • https://s3.amazonaws.com/teximikamukubo/the_making_of_star_trek_stephen_whitfield.pdfIn PDF document text
    • https://s3.amazonaws.com/lumixi/62744715512.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f606.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF606 5176 bytes
SHA-256: 08487eb4401636d105f59afa8c3ecc21110f8f3d09f27a8c56456601310d459d
font_01_sfnt_off0001078b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1078B 11024 bytes
SHA-256: 23ef338eed0ade210caf4dc30b49fdf4271aacf2eb5562cfdceed98371615b04
font_02_sfnt_off00012d52.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D52 16028 bytes
SHA-256: 0bae8649ba252bcfab81cb8324cfe1737d73e47191b507e117e6d0858e0066a8

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