Malicious PDF — malware analysis report

Static analysis result for SHA-256 f9f9daacc100943a…

MALICIOUS

PDF

72.8 KB Created: 2021-06-04 20:33:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: 53e27542cc8a73665dc2024d602a7515 SHA-1: 2216b66847f785bf54515bc15cdff98b82f94ec0 SHA-256: f9f9daacc100943a37f482a44fc34bbb104920df0ed31d11251589fb4a758f32
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. An external URI, https://synerhu.ru/pbw?utm_term=video+converter+to+mp4+free+online, was extracted, suggesting a phishing or malware distribution attempt. The document body, though heavily obfuscated, contains references to 'Video converter to mp4 free online' and authoring information, reinforcing the lure.

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://synerhu.ru/pbw?utm_term=video+converter+to+mp4+free+online PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4491410/normal_6055228f41bdf.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4475217/normal_5ffac1f46c35a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4418987/normal_600fa5caad1b0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4409118/normal_606aedc82886a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4372980/normal_604d5f02458d0.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4457312/normal_60027fd40c1f4.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4456121/normal_5fc963db6899e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367919/normal_60600f4a83a06.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4423148/normal_60552c4192b58.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4372702/normal_5ffb3c44ca314.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368245/normal_5fd66df71bd38.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4408352/normal_5fc6aa6b8b666.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380523/normal_5fd171e512d6b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370542/normal_601cbbd958e95.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384039/normal_602562e85404f.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4381082/normal_5ff66ac6add15.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4482230/normal_60342012465fb.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://tazijebep.pbworks.com/f/91587205795.pdfIn PDF document text
    • http://tozuxexap.pbworks.com/f/94202929086.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_off0000dfcf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFCF 5024 bytes
SHA-256: 37eb09851b1dd6871a0a44ac4d72eb51b41475caaf2e1e31210b93b0dd825b69
font_01_sfnt_off0000f0e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0E5 11308 bytes
SHA-256: a139e50e28d26a15798289368c85e43004092408c075a572b00d67ce4da1377c

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