Malicious PDF — malware analysis report

Static analysis result for SHA-256 190a85f7479754d1…

MALICIOUS

PDF

74.9 KB Created: 2021-02-25 17:30:06 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 5aa18baa70fbf974d6ed92bc7625fbc2 SHA-1: dccc158f3ae33483dd4163171e8e014824f40d5f SHA-256: 190a85f7479754d1e6d776537df7781154be09a9023cfcd9d189beeab428dbd9
116 Risk Score

Malware Insights

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

The PDF file contains a malformed stream and an embedded URL that is likely malicious, as indicated by ML classification and ClamAV detection. The document body, though heavily corrupted, suggests a lure related to a Nintendo Switch 2, aiming to trick users into clicking the embedded link. This link likely leads to a phishing page or a second-stage malware download.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Malformed active-content stream length medium PDF_MALFORMED_EXPLOIT_STREAM_LENGTH
    A PDF stream that carries active/exploit-looking content has a declared /Length that does not match the recovered stream body. Malformed stream boundaries and length mismatches are common parser-evasion/supporting evidence around Reader exploit streams.
  • 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://seumenha.ru/strik?utm_term=is+there+a+nintendo+switch+2+coming+out PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4446400/normal_601aaa0940f98.pdfIn PDF document text
    • http://zerkalo-fugicar.website/zexifozukevakufurojopufryed.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4386361/normal_5fd32062e5dfe.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4415068/normal_601070cfd8191.pdfIn PDF document text
    • https://cdn.sqhk.co/dalegoti/qHeKggh/64716824293.pdfIn PDF document text
    • https://cdn.sqhk.co/ruwonumatag/h8FW1jd/orange_money_transfer_ahmedabad.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4414159/normal_5fe43458c6295.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4496374/normal_5ff833ecbdfc0.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/dazovosugev/dengue_awareness_campaign_report.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_off0000e864.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE864 5484 bytes
SHA-256: abb16267ee046446b818235eed740bc591d73297eec02fcf0ce307083d355d7f
font_01_sfnt_off0000faf0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAF0 10472 bytes
SHA-256: f45d475588748e32e9a4c320b8f7ad36ad2a32341ea8511aafe2236d8622af7d