Malicious PDF — malware analysis report

Static analysis result for SHA-256 3a528bde485b43b9…

MALICIOUS

PDF

79.8 KB Created: 2021-03-18 16:03:10 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 514a5f8b56e173ae69e60969f90f011e SHA-1: 9ffbcf07e8dbf8e792d647822be8e1cc16122441 SHA-256: 3a528bde485b43b9364371a53d921132fe446ffc1dded9e3bdffc91a36ecb1e1
96 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. It contains an embedded URI pointing to a suspicious domain, likely intended to trick the user into visiting a malicious site. No scripts were extracted, but the presence of embedded URIs and the overall detection profile 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://leonvi.ru/award?keyword=bwv+147+noten+pdf
    • https://gedaxafi.weebly.com/uploads/1/3/4/3/134340736/tajekipur-kuratifenusutal-dawoxa-sikavema.pdf
    • https://cdn-cms.f-static.net/uploads/4494673/normal_5fdb31cb4b8e3.pdf
    • https://static.s123-cdn-static.com/uploads/4369911/normal_5fe4a6f16be98.pdf
    • https://jorokepevi.weebly.com/uploads/1/3/4/6/134688072/garapo_fedenine.pdf
    • http://ru-dev.xyz/dometic_rv_air_conditioner_thermostat_troubleshooting8hs84.pdf
    • http://kegawati.iblogger.org/vexazedejibikelusaxisemab.pdf
    • https://fabirakarag.weebly.com/uploads/1/3/2/7/132710689/219f455b.pdf
    • http://tb-films.ru/how_to_get_pebble_watch_facesu14at.pdf
    • https://static.s123-cdn-static.com/uploads/4422390/normal_60082d4b0e344.pdf
    • http://lakulikelanu.iblogger.org/dobifakekiniwimuvat.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://fepoxojosatomu.epizy.com/95789171696.pdf
    • https://s3.amazonaws.com/pogolo/cofunds_platform_adviser_login.pdf
    • https://s3.amazonaws.com/donarepemi/punenejezeserafokilimutus.pdf
    • https://uploads.strikinglycdn.com/files/307a416b-f13d-4a1e-b242-7438022bb571/ford_explorer_emergency_brake_replacement_cost.pdf
    • http://zudejemil.epizy.com/77951625738.pdf
    • https://s3.amazonaws.com/rujabepifar/25896955462.pdf
    • https://s3.amazonaws.com/xidulumexi/bandlab_music_studio_app.pdf
    • https://uploads.strikinglycdn.com/files/6af9a549-2d34-48cb-a0f0-56f76a122bda/9121232095.pdf
    • https://uploads.strikinglycdn.com/files/e9a675d1-8dd2-4a2d-a398-2bf9ac2b6e10/christmas_reading_comprehension_5th_grade.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
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e3c0.bin
9435969faefc9bf146f82ffec372d72e2cef965776f36cdfcb105da385ec4fcc		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE3C0 4940 bytes
font_01_sfnt_off0000f4dc.bin
2e128a611dd3d335eb04df93b24e2cda113323668bebe4e2d7738fe552688a62		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF4DC 12296 bytes
font_02_sfnt_off00011ca8.bin
4360e29b7d2504916afe74d557016965ce00ddb6e9b1d1498b998f2d7a1046f9		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11CA8 16184 bytes

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