Malicious PDF — malware analysis report

Static analysis result for SHA-256 5073b1cf31edbf53…

MALICIOUS

PDF

89.0 KB Created: 2021-01-27 19:25:53 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-07
MD5: a55dc8ef5dd756ab0f4a21999b40e0a6 SHA-1: 9922898c86930695b9a7a7001f390a1d8f69fdaf SHA-256: 5073b1cf31edbf5363641a8b788c4733dae089c59e0bc34ac285e46aa07faafe
96 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The file is identified as malicious by ML classifiers and ClamAV, specifically as a phishing trojan. It contains an embedded URL pointing to a suspicious domain, which is likely the intended destination for the user. The document body, though heavily obfuscated, contains references to 'wkhtmltopdf' and 'Hamlet act 1 scene 5 quotes', suggesting a lure to disguise the malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

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://leonvi.ru/123?utm_term=hamlet+act+1+scene+5+quotes PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4420905/normal_5fe272cf1dd26.pdfIn PDF document text
    • https://vipapixamez.weebly.com/uploads/1/3/0/8/130814430/5fa10.pdfIn PDF document text
    • http://nefuzixitelu.iblogger.org/68028635952.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4381748/normal_5fdb6792102a0.pdfIn PDF document text
    • https://cdn.sqhk.co/bawusipa/jgkLij7/spin_the_bottle_app_for_android_phone.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4454558/normal_5fe05e11860e6.pdfIn PDF document text
    • http://votofeveta.iblogger.org/81035531568.pdfIn PDF document text
    • http://gevixadita.22web.org/5233166379.pdfIn PDF document text
    • http://badodamibevije.iblogger.org/25430403031.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4490366/normal_5fdd16b9ef218.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4529281/normal_5feb99a709223.pdfIn PDF document text
    • http://kikudesazogug.22web.org/oxford_discover_6_free.pdfIn PDF document text
    • https://gafepodaxo.weebly.com/uploads/1/3/4/6/134606739/c0d3e56cc.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://vemevusakeke.epizy.com/sasaxabisotigopiso.pdfIn PDF document text
    • http://moxododokojuke.epizy.com/baaf_viability_assessment_template.pdfIn PDF document text
    • http://zifopodisinuri.rf.gd/45105414587.pdfIn PDF document text
    • http://zudosikewemer.epizy.com/70408958847.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_off00011fba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11FBA 5112 bytes
SHA-256: 9d6f75b8ad1cf07598f2fa58644be3c6aced02983d2af607ddf11a8e3de3bf88
font_01_sfnt_off0001311d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1311D 11032 bytes
SHA-256: 22abf52d5ea095838c9cbc119b004d868c2f9275852ba50c7eb21dedfd0fbe56

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