Malicious PDF — malware analysis report

Static analysis result for SHA-256 16d8a6c7cbf5c869…

MALICIOUS

PDF

80.6 KB Created: 2021-04-23 22:29:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1594afea08d107c8751e5df4893f4b16 SHA-1: 21a4b2d2e98b8e9fece24d4f0b9e158f3a97621c SHA-256: 16d8a6c7cbf5c869d68d40c52c9f8322df7f2cc4c9721c5e4dc16f0c7cc71659
96 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, with the primary one being 'https://resalured.ru/strik?utm_term=amazon+echo+studio+user+manual', suggesting a lure to a phishing site. While no scripts were explicitly extracted, the PDF structure and heuristic firings indicate malicious intent, likely related to initial access via spearphishing.

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://resalured.ru/strik?utm_term=amazon+echo+studio+user+manual
    • http://reduslim-italy.site/xuvawisepimadawafesuxilex1zl0.pdf
    • http://lolkek.xyz/define_parliamentary_form_government2ss9u.pdf
    • http://xunopapazugatar.medianewsonline.com/gunorogejizigo.pdf
    • https://cdn.sqhk.co/bularalunop/jcFjbpI/96652049418.pdf
    • https://cdn.sqhk.co/xovujiroveg/fhhijai/automated_testing_android_apps.pdf
    • https://cdn.sqhk.co/kiwapipu/bhcyjeU/59206151077.pdf
    • https://cdn.sqhk.co/nasubivapu/aifShf6/vozadajozix.pdf
    • https://cdn.sqhk.co/dalegoti/qhdhdp3/nasesefijodatuxik.pdf
    • http://farozemirig.scienceontheweb.net/20378934216.pdf
    • https://cdn.sqhk.co/gasawivu/hcNggji/15214015070.pdf
    • https://cdn.sqhk.co/jitolado/ajeQ6jg/ice_cream_truck_rental_for_parties_near_me.pdf
    • http://tumbochka.space/wuxugapitedabe9w2ch.pdf
    • https://cdn.sqhk.co/lagusive/divigJs/gemofufovevepujekog.pdf
    • https://cdn.sqhk.co/pabukerofo/hie5cjg/war_robots_download_pc_windows.pdf
    • https://cdn.sqhk.co/lomasamube/iTiivK2/dc_united_new_york_city_fc_sofascore.pdf
    • https://cdn.sqhk.co/metexemoraga/DhghiBS/53549022701.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • 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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ff2a.bin
62f1feab8fbc9510303596cd5ab4c247f85a26f65a4c9a0627ded4f025d8324b		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFF2A 5216 bytes
font_01_sfnt_off000110bb.bin
b23dcd79ffac9ac2726376164a89dd9ff5c6d5cae0d160ff6fa343d6b5ac7cbb		 pdf-font-stream PDF embedded font (sfnt) at offset 0x110BB 10804 bytes

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