Malicious PDF — malware analysis report

Static analysis result for SHA-256 6434c0cb0c029cfa…

MALICIOUS

PDF

66.0 KB Created: 2021-02-20 14:19:54 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 075e3d74783970fd5d800daa33d3cc4d SHA-1: 30b6d781c8e06449c41186fde108eb3dfcad15b5 SHA-256: 6434c0cb0c029cfa805c3f8f985f1344113704ec41a73e81b4a59a2e6e517da2
96 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and a machine learning classifier indicated a high probability of maliciousness. The document body contains a URL, 'https://jacksth.ru/wb?keyword=down%20at%20the%20cross%20chords%20key%20of%20g', which is likely used to deliver a malicious payload or conduct phishing. No scripts were extracted, but the presence of an external URI and the overall detection suggest a phishing or malware distribution 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://jacksth.ru/wb?keyword=down%20at%20the%20cross%20chords%20key%20of%20g PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4379961/normal_601f67c12a29f.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4451945/normal_60038b1020759.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4473432/normal_6029f68544cd3.pdfIn PDF document text
    • http://tells.fun/5608644778y8qnu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4409095/normal_601bab8cdbcf5.pdfIn PDF document text
    • http://latencfsrt.space/40_meter_ocf_dipolek0bja.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4501775/normal_5feb3a03e225f.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4454051/normal_6008b1aa34a35.pdfIn PDF document text
    • http://file-id.ru/364864670mhq3l.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/xakusineba/rinujixi.pdfIn PDF document text
    • https://s3.amazonaws.com/lopeteb/82173219045.pdfIn PDF document text
    • https://s3.amazonaws.com/gotenukevepunin/44478122586.pdfIn PDF document text
    • https://s3.amazonaws.com/lorifawuvawot/tujekunakema.pdfIn PDF document text
    • https://s3.amazonaws.com/pusori/maintenance_guidelines_worksheet.pdfIn PDF document text
    • https://s3.amazonaws.com/jutenojamega/60794292770.pdfIn PDF document text
    • https://s3.amazonaws.com/luropiw/maritime_safety_management_system.pdfIn PDF document text
    • https://s3.amazonaws.com/jakujakula/antelope_audio_orion_32_hd_manual.pdfIn PDF document text
    • https://s3.amazonaws.com/dogevazapiwediw/amazon_alexa_app_android_play_store.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_off0000c34f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC34F 5508 bytes
SHA-256: 87f1929a732a02878f1e84fa0b64a89931bc931bceb695bd8035d78475fe525c
font_01_sfnt_off0000d628.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD628 10844 bytes
SHA-256: 87cddc0bb2a6255ed415a4b32bc6133511dea90a0429a6fcd8f90399df8c15e1

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