Malicious PDF — malware analysis report

Static analysis result for SHA-256 55c4a99ffd5e3bdf…

MALICIOUS

PDF

68.7 KB Created: 2020-12-25 10:14:25 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-05
MD5: 6ee116ab3315ff02298b7ec8efd402d0 SHA-1: bb42b5027f82e5e9693aa7ee98bb939f9bcca504 SHA-256: 55c4a99ffd5e3bdf677b310a960d58f931adecf8c92ecfec8fbb7ec5b4ae0c58
96 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution T1059.007 JavaScript

The PDF file was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier, indicating malicious intent. The embedded URL points to a phishing site, and the document body, though heavily obfuscated, suggests a lure related to a game hack. The presence of PDF-specific exploits further supports its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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
  • 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://traffnew.ru/strik?utm_term=from+the+sea+game+hack+version PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4455884/normal_5fb2a969a6d9c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4376625/normal_5fbdefdb63d9e.pdfIn PDF document text
    • https://cdn.sqhk.co/dofewijoras/jjfjiju/five_ten_freerider_contact_mountain_bike_shoes.pdfIn PDF document text
    • https://cdn.sqhk.co/nugutobudan/0Ramheh/29443772093.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408997/normal_5fbddd3233e6c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4404753/normal_5fdc6f1abc269.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/sugosubexez/eight_treasures_qi_gong.pdfIn PDF document text
    • https://s3.amazonaws.com/gorajikunobixi/zizaraze.pdfIn PDF document text
    • https://s3.amazonaws.com/xaliwalufoguni/let_it_go_violin_sheet_music.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_off0000d0c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD0C9 5260 bytes
SHA-256: adddd27e92e9367d969f38fbda4b101dd147807ea88dc38fbd5bf6d8ab8bc22e
font_01_sfnt_off0000e28a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE28A 10460 bytes
SHA-256: c95392ed828deaa58f175ae01185fa30a9fe4382d5fd4784d6813befbd3ff30f

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