Malicious PDF — malware analysis report

Static analysis result for SHA-256 10d1b56de3b4e411…

MALICIOUS

PDF

78.9 KB Created: 2021-01-26 15:06:48 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-16
MD5: bb8cc264a454811da6a49303a34ebea7 SHA-1: e5cb6c7d257a5a17b3f0f20946896339339ea2ff SHA-256: 10d1b56de3b4e411643e483de987e327b418bfe006806f57e81ba8ccc85d3280
96 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains an embedded URI pointing to a suspicious domain, 'jacksth.ru', which is likely intended to deliver a malicious payload or redirect the user to a phishing site. The document body, though heavily obfuscated, contains metadata suggesting it was generated by wkhtmltopdf, a tool often used to create malicious PDFs.

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://jacksth.ru/123?utm_term=brilliant+blue+fcf+side+effects PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4374979/normal_6001ea1b6a0e8.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4416660/normal_5fe5eeec5082d.pdfIn PDF document text
    • http://cosmeteca.com/77455146166r6a7f.pdfIn PDF document text
    • http://foyou.store/smashbox_studio_skin_foundation_1._05bft0j.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4423462/normal_5fd2420060ca7.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4493195/normal_5ff25cfc23925.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4444115/normal_60002e07cc4f7.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4369779/normal_5feb285ea5bd4.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4382972/normal_5fc5f6915bcec.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4425235/normal_5fddd34c91162.pdfIn PDF document text
    • http://hookup754.fun/115887120622aq8j.pdfIn PDF document text
    • http://luxshop21.site/vi_editor_append_to_end_of_linelcdj6.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4378381/normal_5ff7c34d5b5dc.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/vuraradaso/advanced_english_vocabulary_games.pdfIn PDF document text
    • http://xawoforusur.epizy.com/mortified_guide_trailer.pdfIn PDF document text
    • https://s3.amazonaws.com/rimejiguvif/4816743562.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_off0000f59e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF59E 5204 bytes
SHA-256: a17db133ed5f434f0b13582e9d04a688f4f42a3a58ee04de4c1669ffdec5c26a
font_01_sfnt_off00010759.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10759 11760 bytes
SHA-256: 67f1b777ca05e68cb9b92bc0a6735f1632bd4fc81a0bc46c21953bc170abc367

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