Malicious PDF — malware analysis report

Static analysis result for SHA-256 b9e376f090a425b8…

MALICIOUS

PDF

76.3 KB Created: 2020-11-24 10:27:31 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-12
MD5: 7d1f94ed7f82fc03d0c7792ed22ef874 SHA-1: 61893e92fb67665114aa9c0a63f902f179407015 SHA-256: b9e376f090a425b80a643ffe40c8f55b14e9a921da876addd69936091c8a6923
104 Risk Score

Malware Insights

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

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains an embedded URI pointing to a suspicious URL, which is likely the download source for a secondary payload. The presence of a 'download button' heuristic further supports the phishing lure attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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=fire+red+randomizer+download+gba PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4366034/normal_5f89fc17a753f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4377400/normal_5faa0bd6a1a50.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4377909/normal_5fbca1651d086.pdfIn PDF document text
    • https://tunomofezu.weebly.com/uploads/1/3/2/3/132303147/7009584.pdfIn PDF document text
    • https://dupilike.weebly.com/uploads/1/3/4/7/134772583/nojirukapuxefi.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4444626/normal_5fa4a031f3748.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4385636/normal_5f9bec0388126.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367903/normal_5f9d9e37969dd.pdfIn PDF document text
    • https://bavejojonosepes.weebly.com/uploads/1/3/1/3/131380601/nazibipedan.pdfIn PDF document text
    • https://kubupukadumu.weebly.com/uploads/1/3/1/3/131382740/5383047.pdfIn 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/2607635c-1f49-470e-8038-1e1aa389572f/58391347036.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d7eef55f-736d-493c-8a3e-11dad0d0962e/wesapunojejuvetosunuje.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_off0000ed5d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED5D 5204 bytes
SHA-256: e65fc548d7554f92817d1f5fb569af1f6c899687bf5ce71fa86ae3a27930f7b8
font_01_sfnt_off0000ff19.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF19 11024 bytes
SHA-256: a8a9687ca153d199d40829364896d900c377792f1a04622ce29815be16c47498