Malicious PDF — malware analysis report

Static analysis result for SHA-256 803631b9e38788b6…

MALICIOUS

PDF

72.8 KB Created: 2021-01-12 10:33:59 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-03
MD5: cdfeb0e7b9c508245f2d6154ed898698 SHA-1: 89e5f09520622761c4648fc762bcb2cf7ccd72c6 SHA-256: 803631b9e38788b6dd17b9f7a5dec2bf65fe4f513ffe6cce58fc0f0b024481da
96 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains an embedded URL that likely leads to a malicious site, suggesting a phishing or malware distribution attempt. The document body, though heavily obfuscated, contains references to 'Analog lab fl studio' and 'wkhtmltopdf', potentially used as a 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://traffnew.ru/aws?utm_term=analog+lab+fl+studio PDF link annotation
    • https://site-1168163.mozfiles.com/files/1168163/noviditoxovudop.pdfIn PDF document text
    • https://site-1172550.mozfiles.com/files/1172550/32863126616.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4477916/normal_5fc8714ee06c2.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4373509/normal_5fe0b5fcdc8db.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4481852/normal_5fbb32dcadc35.pdfIn PDF document text
    • https://site-1177547.mozfiles.com/files/1177547/53380313864.pdfIn PDF document text
    • https://site-1166725.mozfiles.com/files/1166725/judge_judy_episodes_2018.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/juvetaso/nemixuzupebilowopokeneli.pdfIn PDF document text
    • https://s3.amazonaws.com/vufupu/get_ready_do_done.pdfIn PDF document text
    • https://s3.amazonaws.com/zarusegibitumet/38809594776.pdfIn PDF document text
    • https://s3.amazonaws.com/bejeseja/56801594671.pdfIn PDF document text
    • https://s3.amazonaws.com/dojonuta/honda_outboard_performance_bulletins.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d34d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD34D 4872 bytes
SHA-256: 910fa789d9c3fdf2473ee37daba908f4234aa09565c4519f1d21431af674bc3d
font_01_sfnt_off0000e3e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3E2 10596 bytes
SHA-256: fc8a75ccd6f477790919ad1c0ae574c54d717c60f1f6ad5cdc4e6b17c82e9951
font_02_sfnt_off0001083f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1083F 4324 bytes
SHA-256: 1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e

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