Malicious PDF — malware analysis report

Static analysis result for SHA-256 1f858dd9714df2ca…

MALICIOUS

PDF

68.0 KB Created: 2020-12-16 09:50:11 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-05
MD5: 64c26f210dad2d642169518dc305991a SHA-1: baa2b1526a50749fe9b257a74d08e2b75a8bdc5a SHA-256: 1f858dd9714df2ca3d55340d48bf2e5cb3ed694599a84f33bc40b9fb2c4b66fc
96 Risk Score

Malware Insights

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

The PDF file contains heuristics indicating an embedded external URI, and ClamAV detection confirms it is malicious, specifically identified as Pdf.Phishing.Trojan. The ML classifier also flagged it with high confidence. The embedded URL, disguised as a document about computer architecture, is likely intended to lead the user to a phishing site or a download for a second-stage payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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/123?utm_term=advanced+computer+architecture+questions+and+answers+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4412181/normal_5fb2799ddd617.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4480743/normal_5fc7fc5e5bf49.pdfIn PDF document text
    • https://ridolagu.weebly.com/uploads/1/3/0/7/130775195/8604030.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4495525/normal_5fb9f7e468b01.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/bbcd69d8-6b07-4d5f-aec9-7b33c68c4ccf/rave_motion_pictures_davenport_ia.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc0c991c6d9645836219624/t/5fcf02b564290b1c3dcd9c2e/1607402169922/fugumitadijoliwuxutizikom.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fcdec3641ec4a2cc0dfacdf/t/5fcf42bfcd9a2056ff72a43e/1607418560788/25696865600.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc0f6c4e5c7695ca99bf722/t/5fc338e8bc819f1cf4418c9a/1606629614934/figusawugawan.pdfIn PDF document text
    • https://s3.amazonaws.com/nimuwet/terebutipavol.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_off0000cafc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCAFC 5632 bytes
SHA-256: 11a8a7c2a3ea53736a150c8eb2ac5e34fd30f512e1a4bdc9f487231300b5a46b
font_01_sfnt_off0000de0d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE0D 10192 bytes
SHA-256: bad27c7aa4c8060dda6fec8a09f004ba982ac8fa4338b3137cf135cd854c2da7