Malicious PDF — malware analysis report

Static analysis result for SHA-256 0b30eb426564a372…

MALICIOUS

PDF

77.2 KB Created: 2021-03-22 07:33:01 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 860dea37b6a1cb6eb4f0e2b0bc7190e9 SHA-1: e7963ac90acd3a27378c94ae57b5a0746f7c0b64 SHA-256: 0b30eb426564a37269e1ee410a616fdc0530514a0c909d11450d5b70ac0912b2
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The file is a malicious PDF detected by ClamAV and an ML classifier. It contains an embedded URI pointing to a suspicious URL, suggesting a phishing or exploit delivery attempt. The document body, though heavily obfuscated, appears to be a lure related to 'free calligraphy sheets'.

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://xezojetit.ru/award?keyword=free+calligraphy+sheets+pdf
    • https://cdn-cms.f-static.net/uploads/4470685/normal_603f675be2c4f.pdf
    • http://zupinuxuxodu.iblogger.org/aplicaciones_de_motores_de_corriente_directa.pdf
    • http://talezoruvaje.iblogger.org/epilepsy_diagnosis_guidelines.pdf
    • https://razomidubijime.weebly.com/uploads/1/3/4/3/134395635/burizinuxox.pdf
    • https://cdn-cms.f-static.net/uploads/4490736/normal_5fd13779264d4.pdf
    • https://cdn-cms.f-static.net/uploads/4472774/normal_6028101b44b80.pdf
    • https://static.s123-cdn-static.com/uploads/4470412/normal_6004a96e9f969.pdf
    • https://migobajiker.weebly.com/uploads/1/3/5/3/135390735/titejokizurebaxe.pdf
    • https://static.s123-cdn-static.com/uploads/4370051/normal_5fe17f6e93ee9.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://juzavinozil.epizy.com/zusape.pdf
    • https://2c549fd3-bbcc-4e43-aea5-84609313cfd4.filesusr.com/ugd/c162b3_b687259f78964ac589163ed83bf16d3a.pdf?index=true
    • http://vozapubivazub.rf.gd/how_to_win_game_pigeon_chess.pdf
    • http://bujetazufukuv.rf.gd/mathematical_statistics_ii.pdf
    • http://wetedezowob.rf.gd/sirakilijifibipiwam.pdf
    • https://a6132035-7465-4fe4-be4e-2faa96c22dab.filesusr.com/ugd/cf950b_d2e7a733fb23455eb8be81b796f8529c.pdf?index=true
    • 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_off0000ec8a.bin
0ce15510ec60c98d2ec342527cf113fd75236fedbcb8375d1bb0195327408b8f		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEC8A 5472 bytes
font_01_sfnt_off0000ff2c.bin
eef93f02b8530a643c5caf91e9f11fbafbf48ef38cfe71218d3d1be8fb455c03		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFF2C 11496 bytes

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