Malicious PDF — malware analysis report

Static analysis result for SHA-256 3c61364f43d0df03…

MALICIOUS

PDF

76.1 KB Created: 2021-02-11 20:44:50 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-06-05
MD5: 7c6eb9448185414cf2924ebac9125684 SHA-1: af7e7eb01f3073c89601eb6f051ad1f1d569f7bc SHA-256: 3c61364f43d0df03b4a79fd4474b16d49ae7e968e936efd939afb81759c174d7
184 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains embedded links that point to known malicious redirector infrastructure, as indicated by the PDF_MALICIOUS_REDIRECTOR_LINK heuristic. The document body, though heavily obfuscated, suggests a lure related to educational materials, likely to trick users into clicking the malicious links. The ML classifier and ClamAV detection further support the malicious nature of this file.

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://yafferge.ru/wix?keyword=4th+grade+social+studies+textbook+new+york In PDF document text
    • http://susojatafumo.22web.org/lasobo.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4487416/normal_60240c6e5a497.pdfIn PDF document text
    • http://bavewemelemare.iblogger.org/48650738613.pdfIn PDF document text
    • http://bavewemelemare.iblogger.org/platform_ajay_devgan.pdfIn PDF document text
    • http://busibear.com/jonakojatussr27j.pdfIn PDF document text
    • http://sbrf.link/70711137146wujqg.pdfIn PDF document text
    • http://lozajakar.iblogger.org/instagram_mod_apk_more_followers.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4421614/normal_60064e0348e31.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367632/normal_601aee48c22bc.pdfIn PDF document text
    • http://rentline.pro/daughter_of_invention_after_reading_answersak91x.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4419832/normal_5ffde71dcab37.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4459791/normal_5ff9adf11123b.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4450876/normal_5fe0ce2f08dcf.pdfIn PDF document text
    • http://esclub.info/acta_de_constitucion_de_proyectofhei8.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/megodipewukitoj/57177775077.pdfIn PDF document text
    • http://wimoduwogukuruk.rf.gd/altos_adventure_apk.pdfIn PDF document text
    • http://kukejisagev.epizy.com/85824724896.pdfIn PDF document text
    • https://s3.amazonaws.com/wusigipufuvowix/good_schools_guide_australia.pdfIn PDF document text
    • http://riporem.epizy.com/zezaxi.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000eb8c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB8C 5660 bytes
SHA-256: ab81fc32f7a31ba7fb8a0673b3ac785566f04b4ff5f16bf0e694689076e444b6
font_01_sfnt_off0000fef0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEF0 10736 bytes
SHA-256: 26cbfa4ef89b16e3288af80cf818c7a7c4f6d4c94fddfcc5e28fefa74a847657

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