Malicious PDF — malware analysis report

Static analysis result for SHA-256 43b8e5d68cb84657…

MALICIOUS

PDF

69.1 KB Created: 2021-01-19 17:32:28 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 90b2b2a2cce2d1f747a649c8114b77c8 SHA-1: 25d3cb6ac2a41e9d59a2e9bc5e7ea7c72cd4b2c9 SHA-256: 43b8e5d68cb84657c6dbda098e5e91dbee978d1b633b4664017e8ee051fdb1b5
96 Risk Score

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 URL that leads to a suspicious domain, likely intended to host a malicious payload or phishing page. The document body, though heavily obfuscated, contains metadata suggesting it was generated by wkhtmltopdf, a tool often used to create PDF documents from web content, further supporting the phishing 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://jottigo.ru/aws?utm_term=formal+business+letter+format+multiple+recipients PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4403429/normal_5fec6760c2f4a.pdfIn PDF document text
    • https://cdn.sqhk.co/jedelamodafa/ibhhhhw/amazon_alexa_echo_show_setup.pdfIn PDF document text
    • https://cdn.sqhk.co/nupasoxure/Dhjghie/best_electric_guitar_amplifiers_for_beginners.pdfIn PDF document text
    • https://cdn.sqhk.co/galemojubemo/qghhajh/radafotujonaku.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4386347/normal_5fb32fc30df3e.pdfIn PDF document text
    • https://cdn.sqhk.co/gubisagebuto/uzgdHgf/bapeko.pdfIn PDF document text
    • https://cdn.sqhk.co/vuzefegevo/I9jbjf4/gumtree_ireland_buy_and_sell_now.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367625/normal_5f87c602e9735.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/farefasejikap/auto_format_python_code_sublime_text.pdfIn PDF document text
    • https://s3.amazonaws.com/punurum/angry_birds_transformers_mod_apk_ultima_version.pdfIn PDF document text
    • http://zulexesovo.epizy.com/37677003123.pdfIn PDF document text
    • https://s3.amazonaws.com/mejawiwomak/78423411748.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_off0000d4d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4D8 5256 bytes
SHA-256: 78f9a60eb6f0a45e02a9ca5f56a4558012fe78c304339c94ed61016ec8ddb484
font_01_sfnt_off0000e69a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE69A 9672 bytes
SHA-256: 8b4c8aa12ea1946a8f12c25b9b93826767f95f97deb8ffda09e81afb42ad66d6

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