Malicious PDF — malware analysis report

Static analysis result for SHA-256 a1a35438fed87909…

MALICIOUS

PDF

81.6 KB Created: 2021-03-16 20:01:30 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: f9d31d848e6af0d7761e037e4a04c7ae SHA-1: a563f26d8e2c48edcfb30ac88b9899f3d07396c2 SHA-256: a1a35438fed87909d92dc781668c376d117ea406d520123f210079f156cbaff8
96 Risk Score

Malware Insights

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

The PDF contains an embedded URL that leads to a suspicious domain, and the ML classifier strongly indicates maliciousness. The document body, though heavily obfuscated, contains text related to water heaters, suggesting a lure to a phishing or malware distribution site. No scripts were extracted, but the presence of external URIs and the ML detection point towards a phishing or downloader attack pattern.

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://baarspo.ru/strik?utm_term=how+long+does+a+ruud+water+heater+last PDF link annotation
    • https://cdn.sqhk.co/risejesob/dzmghMu/plague_inc_tips_nano_virus_normal.pdfIn PDF document text
    • http://xatakafigudu.getenjoyment.net/jt_alert_2.11.5_download.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4480744/normal_60368b8772307.pdfIn PDF document text
    • http://memimusisat.getenjoyment.net/10671358644.pdfIn PDF document text
    • https://cdn.sqhk.co/rosisole/ihigcgf/pitop.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4474465/normal_6012905ae126b.pdfIn PDF document text
    • http://zememor.sportsontheweb.net/nisamunedusideke.pdfIn PDF document text
    • https://cdn.sqhk.co/tawunipufop/MhiTHIO/draw_so_cute_baby_shark.pdfIn PDF document text
    • http://xulazawelinuze.scienceontheweb.net/adversus_nationes.pdfIn PDF document text
    • http://rigudozefogo.mypressonline.com/delimojigifo.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/gazivemon/38467278481.pdfIn PDF document text
    • https://s3.amazonaws.com/ninazarila/pidanuzopusodefew.pdfIn PDF document text
    • http://bavatesivo.myartsonline.com/jodegidi.pdfIn PDF document text
    • https://s3.amazonaws.com/xabalaru/guzenupinifagivonoti.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5634563d-6fc6-4e0c-a550-7557265072a9/bigorijafiwugodo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0af5ddbc-2d8b-4008-9441-f89cbdf4e57e/dbpower_ip_camera_manual.pdfIn PDF document text
    • https://s3.amazonaws.com/lakujusitejojet/final_fantasy_xv_mobile_strategy_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/bojafazes/magnetic_induction_experiment_lab_report.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f505.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF505 4976 bytes
SHA-256: 46411420f1dfff599ec738b17e35e98b10d4d62ea9b5089773b0ec3c20e3470f
font_01_sfnt_off000105f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105F5 10924 bytes
SHA-256: 0a65ed0183e876ff863b1cbb70677042c192b515ccde3cdce0a61ec675a4af18
font_02_sfnt_off00012b3a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B3A 4324 bytes
SHA-256: 4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3

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