Malicious PDF — malware analysis report

Static analysis result for SHA-256 b524df6a24cb80f6…

MALICIOUS

PDF

77.4 KB Created: 2021-02-14 20:50:03 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: c2d6351d69eb4fbd148c3501fb1b2187 SHA-1: d72786de1be9d07b2e2fdf6c13d5ce0611cd8f68 SHA-256: b524df6a24cb80f6899f843129ac5a1d791d41a7626a87c8261ae3aff6a0b9d2
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, specifically identified as a phishing trojan. It contains an embedded URL that, when clicked, likely leads to a malicious site. The document body, though heavily obfuscated, suggests a lure related to a treadmill manual, aligning with phishing tactics.

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://druttle.ru/wix?keyword=weslo+cadence+g40+treadmill+owners+manual PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4380682/normal_5ff6b1306cbc1.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4413226/normal_6004cc9634d68.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4388413/normal_5ff043fb8056d.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4403684/normal_600602760be55.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4452157/normal_5ffe019e4ca9c.pdfIn PDF document text
    • https://cdn.sqhk.co/dofewijoras/gES4Dib/72429360601.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4372358/normal_5fdf0b7da9b43.pdfIn PDF document text
    • https://cdn.sqhk.co/jozojonujaj/ijdjagd/chassis_rally_legends_rc.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4465691/normal_5fd7e38e1f453.pdfIn PDF document text
    • https://cdn.sqhk.co/webuzifinuno/jbifT4B/snapseed_online_editor_for_pc.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387061/normal_6015e50594637.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4415783/normal_5fe0bb4e9f4d8.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4448137/normal_5fcd55ad2fdc1.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4454041/normal_6008cac0bb159.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380543/normal_6013f7d38065e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4497075/normal_6013c9cb2b03a.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/wujanozo/99038145979.pdfIn PDF document text
    • https://s3.amazonaws.com/fonazuzixagizir/rugododumul.pdfIn PDF document text
    • https://s3.amazonaws.com/mesotodimus/diabetes_and_hypertension_coding_guidelines.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_off0000f1aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1AA 5592 bytes
SHA-256: a8c2ea43aa6f71f4204ec1b8a4861e95b3db1bf6ddedc3bd3c1bed5ba32dce49
font_01_sfnt_off000104b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104B7 10416 bytes
SHA-256: 2ca3fd2d1bd4a0e9dce742a6e922fd74c604486fc6c9f74ae638458b1a97547d

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