Malicious PDF — malware analysis report

Static analysis result for SHA-256 b359d813f7e4c0a6…

MALICIOUS

PDF

75.1 KB Created: 2021-01-09 19:05:18 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: ff1392df4de98df960025f9fa76f4c9b SHA-1: 76089ed3f244a93f79f8f91cffc98018bfe128c3 SHA-256: b359d813f7e4c0a693ef7bb8937f10cf107653e36565a424e893ef9693277149
96 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The embedded URL points to a domain associated with phishing, and the document body, though heavily obfuscated, suggests a lure related to employment forms. No scripts were extracted, but the presence of an external URI is a strong indicator of 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://trafffi.ru/aws?utm_term=employee+self+evaluation+form+templates PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4369525/normal_5fcea8f4c5b4c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4382201/normal_5f8f83c273d27.pdfIn PDF document text
    • https://cdn.sqhk.co/lawafopugu/hi3Njdi/hair_salon_in_walmart_phillipsburg_nj.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4381543/normal_5fee06c24c36d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4452206/normal_5fd735684d67c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413848/normal_5f9d2359c7062.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375086/normal_5f9795cf0eacb.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/bejokazemur/the_sniper_worksheet_answers.pdfIn PDF document text
    • https://s3.amazonaws.com/lovomijelun/adosphere_2_gratis.pdfIn PDF document text
    • https://s3.amazonaws.com/vixuwogetiv/netuvojeveke.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_off0000e97b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE97B 5164 bytes
SHA-256: 98e19f79c86556d790f193dd7a9b1b1d148ddf456ba779be11f9133312121270
font_01_sfnt_off0000fb0c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB0C 10744 bytes
SHA-256: a102c7c05b0d9899a4e104bd2b1e1011c8345637f179b9783431600786035701

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