Malicious PDF — malware analysis report

Static analysis result for SHA-256 85938cc9d1e2c387…

MALICIOUS

PDF

167.0 KB Created: 2020-12-24 07:08:06 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-07
MD5: 120b15d69b15c7e59f9212fca7bbb1d2 SHA-1: 52a391317827b84ebccf7b97d14875b82685fb03 SHA-256: 85938cc9d1e2c3875a1b13097d864b5587a7c1b7cb845fbb8b602c50be45b590
96 Risk Score

Malware Insights

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

The file is a PDF document identified as malicious by ClamAV and an ML classifier. It contains an embedded URL pointing to a suspicious domain, likely intended for phishing. The document body, though heavily obfuscated, contains text related to 'Monterey park private elementary school', suggesting a lure. No scripts were extracted, but the presence of an external URI and the overall detection suggest a phishing attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://trafffe.ru/123?utm_term=monterey+park+private+elementary+school PDF link annotation
    • https://kigusokitog.weebly.com/uploads/1/3/5/3/135300221/musulizi_tenuz.pdfIn PDF document text
    • https://gefelamanak.weebly.com/uploads/1/3/4/3/134353999/d40f59e4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4382973/normal_5f8e756b67e7f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4372378/normal_5f9984a51529e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4388406/normal_5fbcad2c408b4.pdfIn PDF document text
    • https://bexudedumazises.weebly.com/uploads/1/3/1/4/131406785/4fcfb050aca.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/getizar/autocad_hide_border.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8267126d-2f54-48ca-96df-001b4c2d6ad1/kopogajikemufusezexugo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8a7099e1-116b-4937-a52a-f44a0f9df104/renizokiwi.pdfIn PDF document text
    • https://s3.amazonaws.com/woberiz/50066069755.pdfIn PDF document text
    • https://s3.amazonaws.com/wudibirewuduto/1546652339.pdfIn PDF document text
    • https://s3.amazonaws.com/vajefam/31685840326.pdfIn PDF document text
    • https://s3.amazonaws.com/xurixado/77123474835.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_off000258cd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x258CD 5404 bytes
SHA-256: 20c2d748d8b103bff7e12189076c7bf939f2562ccc0b0b44c77ca52dcc0cdd25
font_01_sfnt_off00026b20.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x26B20 10188 bytes
SHA-256: 8f0926a48290bdfc4578a7b5aa45dd978abe98ca7196c324b89fb5fb1ec2eb58