Malicious PDF — malware analysis report

Static analysis result for SHA-256 89a73dd55b1a260f…

MALICIOUS

PDF

73.7 KB Created: 2020-12-23 23:26:35 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 00e467a501cdb2a64f8579da0843d02b SHA-1: 153a5517690268721f092e9a34dbef58e50aee59 SHA-256: 89a73dd55b1a260f26f5f366ad85a4a4a192eae9b292e5aef6573e2f28f059e4
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 URI pointing to a suspicious domain, likely intended to redirect the user to a phishing site. The document body, though heavily obfuscated, contains text related to 'Dynalist open source alternative' and 'wkhtmltopdf', suggesting a lure to disguise the malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

Heuristics 4

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://traffset.ru/strik?utm_term=dynalist+open+source+alternative
    • https://xojerajap.weebly.com/uploads/1/3/1/3/131384359/bokisoj-sivagafa-guzezivobo.pdf
    • https://cdn-cms.f-static.net/uploads/4458137/normal_5fbf6a4c26ab1.pdf
    • https://cdn-cms.f-static.net/uploads/4393911/normal_5f90f53a4e5db.pdf
    • https://cdn-cms.f-static.net/uploads/4392869/normal_5f93b074b92fb.pdf
    • https://cdn.sqhk.co/lofopapenow/Vk7Aijd/gabukix.pdf
    • https://kerizivol.weebly.com/uploads/1/3/4/6/134665291/luzujo.pdf
    • https://cdn-cms.f-static.net/uploads/4369142/normal_5f9240e913850.pdf
    • https://fotejisatowonu.weebly.com/uploads/1/3/2/3/132302873/bexuludokemasi-gejite-jitedawozo.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/7e47fab4-122c-4416-9f28-3ea5809effa5/lekukodeputozebinigunuz.pdf
    • https://uploads.strikinglycdn.com/files/8f985eb7-e835-48a2-acb6-fb07e62a5759/florida_eviction_notice.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cdad.bin
71cac1ee32549b383972a9b5dc73becfcf828dba99a8ed5fa7ebe2859c62fb94		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCDAD 5088 bytes
font_01_sfnt_off0000df22.bin
d525a4ae16bb3de878f236838e094ea9666fdbdf7f3dfde0cb5b8498ecc731d4		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDF22 10932 bytes
font_02_sfnt_off000104c2.bin
4a82d930af4ff3021f3d19cbd37464c8e664c90bef13661c9db69df894853898		 pdf-font-stream PDF embedded font (sfnt) at offset 0x104C2 16136 bytes

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