Malicious PDF — malware analysis report

Static analysis result for SHA-256 4cb19cbeea021dbe…

MALICIOUS

PDF

85.2 KB Created: 2020-12-23 21:25:52 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-06-05
MD5: fc2c78543527b975a4d26054a6fbd450 SHA-1: 3f81523cc3fccdf9a1913c6db8dc1941d62e4ea6 SHA-256: 4cb19cbeea021dbe87eb75008eba20788d5aa357cf8f837aa46176b6ddd86ea7
154 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains a critical heuristic firing indicating it links to known malicious redirector infrastructure. The ML classifier also strongly flagged this PDF as malicious. The embedded URL points to a suspicious domain, likely used for phishing or malware delivery. No scripts were extracted, but the PDF structure itself facilitates the malicious redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

Heuristics 4

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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.
  • 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://cctraff.ru/123?utm_term=william+james+middle+school+football In PDF document text
    • https://cdn-cms.f-static.net/uploads/4405925/normal_5f9de5161b0d8.pdfIn PDF document text
    • https://cdn.sqhk.co/kapidibewomu/EBuBhbM/i_am_innocent_ios_cheats.pdfIn PDF document text
    • http://www.opentle.orgIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/2a256816-5b81-4aa0-a9a1-3e43f783784e/earth_day_pictures_to_color.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/564f9dc0-b1d6-4343-ac9d-b3844b1a8227/rofulijebebemolivegepipas.pdfIn PDF document text
    • https://s3.amazonaws.com/jivala/fighter_class_skills_pathfinder.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6953e565-b32d-4a04-b803-f168e0d45a30/livros_percy_jackson.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cd1313e0-53b4-4865-8f5b-cae46353a7c5/98233357652.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d26e9368-dc8b-4251-9834-4dc71b4a034f/galemibofofekunefiji.pdfIn PDF document text
    • https://s3.amazonaws.com/kiwopusafize/76585213337.pdfIn PDF document text
    • https://s3.amazonaws.com/xeruxaxer/jugililamegokegafok.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://www.gnu.org/licenses/gpl.htmlIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_003_off00010742.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x10742 9808 bytes
SHA-256: e1ba4f23f2a93fb2b0e8971bf3772c4114a0fad205e8623d991d0efcfa1d22ef
font_00_sfnt_off0000f505.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF505 5396 bytes
SHA-256: 8a48396da5cd191e123d94ac391d20ae637f60552c894d701e3e61d8db4a320f
font_02_sfnt_off00012202.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12202 11072 bytes
SHA-256: 6a456e8928a9c5065f0d28e7e5c8515e5e4a3e54bd632f5f178ef0f51cbbb345

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