Malicious PDF — malware analysis report

Static analysis result for SHA-256 328309a4220e20f4…

MALICIOUS

PDF

87.0 KB Created: 2020-12-14 19:27:46 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: 47f6350f0556f34a03f67381dbf8f658 SHA-1: 0a878a1a12701fca7938dc75788fbccb2d0faada SHA-256: 328309a4220e20f4f1eb23093f60d83fbe3409f721a5e1bdd481082e700c8c82
96 Risk Score

Malware Insights

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

The file is a PDF containing an embedded URL that points to a suspicious domain. ClamAV and an ML classifier flagged this PDF as malicious, specifically as a phishing trojan. The document body is heavily obfuscated, but the presence of the external URI and the high risk score indicate a malicious intent to redirect the user to a potentially harmful site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9967

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=metro+arms+1911+parts PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4383321/normal_5f98c92732583.pdfIn PDF document text
    • https://pelosewedi.weebly.com/uploads/1/3/4/7/134753512/kijulowula.pdfIn PDF document text
    • https://xibopenevitamog.weebly.com/uploads/1/3/4/4/134488628/sodob_lugovanuke.pdfIn PDF document text
    • https://vunemagerubu.weebly.com/uploads/1/3/4/5/134525741/1810a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4421036/normal_5fada447283bb.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4457311/normal_5fc8927be0bfe.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/045389e4-2228-4468-ae4f-3440ed1feedd/starcraft_2_heart_of_the_swarm_torrent.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fbce344be7cfc36344e8aaf/t/5fbf5df25147b148042ad197/1606376948362/jaguar_vin_decoder_options.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d8c4275b-c2fa-4c32-8421-7576674a21e5/59892320724.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_off0001164d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1164D 5144 bytes
SHA-256: 8c06df41cbe9f710d1fc4c5eebe84ea865cfd0a8d2eb167f1164fbe3f2d8bd23
font_01_sfnt_off000127c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x127C3 11616 bytes
SHA-256: 05367560fec4e74bc22adc75949edb48726c0f7e437f6116c3bfeb02b92bd29f

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