Malicious PDF — malware analysis report

Static analysis result for SHA-256 b85f79154c4d0f62…

MALICIOUS

PDF

78.0 KB Created: 2021-04-03 20:06:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 7fb589616b562d668ce4b686cdd0dfbc SHA-1: 7e9ce8d3174aef68a3fbbf4626550a70d51907ab SHA-256: b85f79154c4d0f62c16479f422522b0e4b93408dbcec05ad10773e92c5f71bce
96 Risk Score

Malware Insights

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

The file is a PDF that contains an embedded URI pointing to a suspicious domain, identified by ClamAV as 'Pdf.Phishing.Trojan'. The ML classifier also strongly flagged this PDF as malicious. The document body, though heavily obfuscated, appears to be related to search result content, suggesting a phishing or malware delivery lure.

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://seumenha.ru/award?keyword=beowulf+modern+english+translation+pdf
    • https://static.s123-cdn-static.com/uploads/4463262/normal_5ffe9d128009f.pdf
    • https://cdn.sqhk.co/pabelewexo/Thadxii/grizzly_bushcraft_pocket_knife.pdf
    • https://cdn-cms.f-static.net/uploads/4500201/normal_601954bb7bc6d.pdf
    • https://cdn.sqhk.co/navimoxa/gzhaQgj/43914836931.pdf
    • https://cdn-cms.f-static.net/uploads/4418796/normal_6048188681825.pdf
    • https://cdn.sqhk.co/jazumagefo/gfZ062Q/international_business_management_course_in_pune.pdf
    • https://cdn.sqhk.co/kofosenolo/qQjeMiF/40639777199.pdf
    • https://static.s123-cdn-static.com/uploads/4456140/normal_5ff5d9fe1b84c.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/2a7a66f8-0917-4f80-8630-a955be47eca7/hp_officejet_pro_8620_printhead_issues.pdf
    • https://s3.amazonaws.com/pusolefosex/grobag_1_tog_temperature_guide.pdf
    • https://6d1a2d78-ebd2-4140-94a0-411197be5b5f.filesusr.com/ugd/88ff89_f931e8121a5e408ab9a9406e6c3c8a91.pdf?index=true
    • https://uploads.strikinglycdn.com/files/d0efe950-8004-4108-8525-2b7887ea317b/99638398614.pdf
    • https://uploads.strikinglycdn.com/files/39e9c64a-c8b1-43ee-a983-8f789be54ea8/89918790486.pdf
    • https://bd15da75-ee01-4ad3-8b22-4778d9929f37.filesusr.com/ugd/1abc29_12fff551d2274897a4a5ce18a83a754c.pdf?index=true
    • https://2a4c341d-9af7-4f89-b48a-1b926ad6ced7.filesusr.com/ugd/dd6616_66caf15deca54ca794e8738579c64296.pdf?index=true
    • https://2e4d99de-9d37-4ce2-abd5-0bbccafdbe51.filesusr.com/ugd/33a2e4_80ea6b7cae324dc689957d6418254df6.pdf?index=true
    • https://f87ce62f-3d5d-4c42-bff3-2e7d00444551.filesusr.com/ugd/72ed28_849ca0bd6a2545cd9aefabab9db4dfe6.pdf?index=true
    • https://5b5cf7c4-d983-4e27-bd54-44d52fc9074e.filesusr.com/ugd/2f9450_5a44ae0cb4794a74903a86e862db5615.pdf?index=true
    • https://s3.amazonaws.com/libowebujakux/word_count_in_excel_spreadsheet.pdf
    • https://s3.amazonaws.com/fisulefajow/zuligonop.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ef8b.bin
1565ffa2231551165228571f56944cd90ccde7dd86f30e41de330a55cf25bae7		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEF8B 5596 bytes
font_01_sfnt_off0001027e.bin
27c0e7df9dbabeb5c15edbaa1860e7562d8fff29568c0d19bf58e21427e9bee4		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1027E 12380 bytes

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