Malicious PDF — malware analysis report

Static analysis result for SHA-256 f2f2f638484b1108…

MALICIOUS

PDF

74.2 KB Created: 2021-06-10 00:57:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: cc4f6241b209648dce1aabf6d9ae090e SHA-1: e6a9a1d1227d96f5007044b9312d1e0c8d44b286 SHA-256: f2f2f638484b1108e1f4e3d3c2e3b16f74c7700373899c42f6739a54f0b3bbaf
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. It contains an embedded URI pointing to 'https://crysiq.ru/pbw?utm_term=temperature+conversion+worksheet+kelvin+celsius+fahrenheit+answers', which is likely a phishing or malware distribution lure. The document body is heavily obfuscated and unreadable, but the presence of the malicious URL and the overall detection verdict strongly suggest a phishing or malware delivery attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://crysiq.ru/pbw?utm_term=temperature+conversion+worksheet+kelvin+celsius+fahrenheit+answers PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4444644/normal_5fca6d987e622.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4424026/normal_606806d2937a9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417206/normal_60597014d6066.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4530578/normal_605f383f74d76.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4391335/normal_5ff9cc38be451.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4467612/normal_60b86813b5157.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4461746/normal_60150fa11651d.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4367646/normal_5ff04a9c8df05.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/ee07d14d-58a3-47dd-987f-2129818193ee/95355380150.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/88df5089-a21e-42a3-8c9c-d0a924a0709c/bissell_carpet_cleaner_1383.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6a8d08ff-e8f6-447f-aed1-221054064609/john_dewey_philosophy_of_education_summary.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c0320d8e-de8f-4a74-a96c-2837180c6a34/kezuti.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/76e88640-c589-4b42-b8ea-bda6e062aaea/construct_2_3d_tutorial.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e1f88feb-efeb-4b84-a632-11c18b09f13c/mikadozijaga.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6fef72c0-54de-4533-894c-9d640ebd65c6/how_to_reset_zojirushi_water_boiler.pdfIn PDF document text
    • http://mazibudikor.pbworks.com/f/22887099160.pdfIn PDF document text
    • http://mujefapufefi.pbworks.com/f/are_oakley_batwolf_z87_approved.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cf1b7cec-b6b4-4542-9a7f-bb0ad5f47417/lemon_detox_diet_plan_for_weight_loss.pdfIn PDF document text
    • http://mizunebapod.pbworks.com/f/republic_ez_spreader_manual.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_off0000e4ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4CA 5420 bytes
SHA-256: 4c67be9c3fb87eb96d352378e4f8a0b1e90e721209eef0b75f36a4f46a1c04ef
font_01_sfnt_off0000f720.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF720 10432 bytes
SHA-256: 7a6651904fb003e2b8ebde668437ba3e2d31e2554fab4c561b29c2b9b16f5e2f

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