Malicious PDF — malware analysis report

Static analysis result for SHA-256 cca8a57db3af1e21…

MALICIOUS

PDF

60.5 KB Created: 2020-11-22 01:32:56 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: f4b79d9da8e91a120682c257cde9fc89 SHA-1: dd845a64f94bf7523ff298cecf88977518a0e63f SHA-256: cca8a57db3af1e21592f88946ea693625abce5e169aee136a4de83afa0c79e33
96 Risk Score

Malware Insights

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

The PDF was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains an embedded URI pointing to 'traffset.ru', which is a strong indicator of a phishing or malware distribution attempt. Although no scripts were explicitly extracted, the PDF structure and the presence of external URIs suggest an attempt to redirect the user to a malicious site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://traffset.ru/aws?utm_term=celestial+island+sheet+music PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4419629/normal_5f9d259a37e00.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4424637/normal_5f9a0acdc5d23.pdfIn PDF document text
    • https://seririgikum.weebly.com/uploads/1/3/0/7/130739922/datakug-vikaki.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4410976/normal_5f9d7f9dc6140.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383930/normal_5f9eda629e142.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368469/normal_5fb2f383291bc.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4452609/normal_5fb6b75ce6f12.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/4ceafb1b-9d9c-4693-9efd-0ce65d843d76/dixuwalubusitudikedurija.pdfIn PDF document text
    • https://s3.amazonaws.com/jofunozuzof/10810430891.pdfIn PDF document text
    • https://s3.amazonaws.com/dukexajuj/4845579901.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/080dd332-8933-4e77-8e60-a66740dcfa96/87485962000.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/34bffdac-b3e8-4efa-b6e7-112152e7672a/similar_triangles_answer_key.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6f4e0e2f-cf23-4581-8274-810c12184223/partition_claudio_capeo_un_homme_debout.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2206b5bf-7077-4c62-bc0a-ae1413a0eae5/99934972077.pdfIn PDF document text
    • https://s3.amazonaws.com/jimugivos/nesexidamimagu.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_off0000b23f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB23F 4988 bytes
SHA-256: 263864f933ec8ddacd45d06925edfe4ea05494b4d8e2ba4dbfd55636d90e1866
font_01_sfnt_off0000c309.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC309 9536 bytes
SHA-256: dfdda55808c373c141f5c7911c2294e8b53cdb6a1caa6d64689dee6b75cc3378

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