Malicious PDF — malware analysis report

Static analysis result for SHA-256 8348bc53dda821fb…

MALICIOUS

PDF

67.1 KB Created: 2020-11-25 07:13:57 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: dca984a83ba56db4e10d239fee278201 SHA-1: 71045c908b0c2de2825002d8d319f1d4d7b0001a SHA-256: 8348bc53dda821fb48a8e499c5ede97ea57b70717d720f48e0d1903fce0c927d
154 Risk Score

Malware Insights

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

The PDF contains an embedded URL that points to a known malicious redirector. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or to download further malicious content. The document body, though heavily obfuscated, contains strings related to PDF and download, reinforcing the lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 4

  • 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.
  • 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/strik?utm_term=sol+de+medianoche+pdf+gratis+2020 In PDF document text
    • https://cdn-cms.f-static.net/uploads/4413578/normal_5fa1b6a8ea75c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384821/normal_5fa6fedc67f1c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4466173/normal_5fa9b30b75017.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4385230/normal_5f91f92f0e48a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366993/normal_5f9526f7d4509.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4427820/normal_5fb2b1ab164ba.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374207/normal_5f8dfd775d949.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367680/normal_5f9d36a5e9e75.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4451374/normal_5fa6b50f77375.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379477/normal_5fa2f8bc5283b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4404740/normal_5f95afa6a5f01.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/kopisigapub/kuwasuzet.pdfIn PDF document text
    • https://s3.amazonaws.com/wizitifowubux/maderuwazufoxibebexut.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_off0000c2ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC2AD 5944 bytes
SHA-256: 92dd6046297f91677f24b67622408e33c9dcf804b50f47893f6ab2aee10d3a74
font_01_sfnt_off0000d6bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6BC 12332 bytes
SHA-256: f8c4b2d8ea49c27e0d768a3ac290aa0193e580900e376f3942b7dcf95a98b6a8