Malicious PDF — malware analysis report

Static analysis result for SHA-256 903ecd7d1d707c9b…

MALICIOUS

PDF

67.9 KB Created: 2020-11-20 08:08:05 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-26
MD5: e4d5941744fd17456d4a122c182f5c48 SHA-1: 58a1c1c4a154439374dd181ddab873b75bf9c5f1 SHA-256: 903ecd7d1d707c9b67b3d45fa0680aff3a97a02ecdbb5cc9335f7d1e23e8f2cf
96 Risk Score

Malware Insights

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

The PDF file contains an embedded URL that directs users to a suspicious domain, likely for phishing or malware distribution. ClamAV and ML classifiers flagged this PDF as malicious, indicating a high probability of malicious intent. The presence of an external URI and the overall classification strongly suggest a phishing attack disguised as sheet music.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9883

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=allegretto+grazioso+gurlitt+sheet+music PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4376127/normal_5f9c9fe7bfce7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450337/normal_5fae3194345fc.pdfIn PDF document text
    • https://kasukironumasex.weebly.com/uploads/1/3/1/4/131454791/916997.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375350/normal_5f9de1b649616.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/9199853e-258a-460d-9e20-6dc13307b994/45459042088.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/15add555-4249-4396-9fab-6fc0f7b27391/xapuzelasanujazajuzowizut.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/456e47dd-7f69-4103-a2a8-5fc65f3035f7/didegivegezalukelo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d8bae65a-3e70-49d8-81c1-236f78cce393/dafadukotokize.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_off0000c917.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC917 5252 bytes
SHA-256: 3c410905073ca6d3dcf082ec6ff18c22eba9dea7f34ffbd036e0c53bb5876844
font_01_sfnt_off0000dad0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAD0 13364 bytes
SHA-256: eb579385502db1ce806fe808cbae575e1bb181fb34ed844bb4f33e9eb3586682

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