Malicious PDF — malware analysis report

Static analysis result for SHA-256 72dcba1331037d66…

MALICIOUS

PDF

75.3 KB Created: 2021-01-06 13:14:30 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: 1d6d8483016f4f61546a7d39eaae0d1c SHA-1: 7e9a6fca4efccedc4c09f275fdbe8ee04b871e14 SHA-256: 72dcba1331037d6674023af04c08c0fae280359d1317e87c32bfba0cbe6dc803
96 Risk Score

Malware Insights

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

The PDF file contains an embedded URL that appears to be a lure for downloading content, indicated by the 'utm_term' parameter. ClamAV and ML classifiers flagged this PDF as malicious, specifically as a phishing trojan. The presence of an external URI and the overall malicious verdict strongly suggest a phishing attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 4

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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/123?utm_term=downton+abbey+pdf+free+download PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4420239/normal_5f9bc9337171d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413016/normal_5fd25fb86de3b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413243/normal_5f9ace1c0bfca.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4476927/normal_5fd30fab2194e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4485801/normal_5fc16baf0221b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366327/normal_5fa984a741c29.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4379613/normal_5fe2cceaeab8c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4446507/normal_5fd881c09f8e5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4411931/normal_5fe84a5152da0.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/98a5f25c-8118-4f53-8d6d-88555e7ea645/walkthrough_among_us_guides.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fd416efa-b23d-4532-a7f0-b7ea29512ecb/black_ops_2_sniper_class.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1ac9b9cd-1e07-40cf-b42a-974909162b73/sitijalume.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/70fa08b8-b3a4-467e-97a2-a0c528126c82/witevelexariniriji.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/700bd839-cd8b-4c76-8423-ba8214fd50de/red_golden_retriever_price.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/249e8ce6-bee1-471a-ad21-f1a3669d3cfe/9248908777.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e1c8462e-2dff-45d1-9971-70fb93dd8656/hitman_2016_missions.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_off0000e94b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE94B 5188 bytes
SHA-256: 42ce4c9253191fce542b3b3ab5f98f417b29ba759a33985ab246ef7cf3d63e96
font_01_sfnt_off0000fb1c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB1C 10968 bytes
SHA-256: 800ff5b0f8d88b0f86fda18eb2b942855bc4d0fe4a7399251a42c3fdc68daee8

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