Malicious PDF — malware analysis report

Static analysis result for SHA-256 cef2aaea8d6eb46b…

MALICIOUS

PDF

91.2 KB Created: 2021-04-15 23:43:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: 41796570251c4d8d0a2319e02f416b6a SHA-1: 253192c6efb78955cf97ba02c051eaa29d61a043 SHA-256: cef2aaea8d6eb46ba26eea3e8a69351d9f83bdc8961435da48831126429d38f5
126 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs, many of which point to disposable domains and are likely part of a link farm designed to redirect users. The ML classifier and ClamAV detection strongly indicate malicious intent, specifically phishing. The primary lure appears to be a search result for 'What dentist accept medicaid for adults', directing users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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://nipisod.ru/strik?utm_term=what+dentist+accept+medicaid+for+adults PDF link annotation
    • http://alcozerox.com/32067116244en1oy.pdfIn PDF document text
    • http://idealslim-italiaoficial.site/pufugomonibswtx6.pdfIn PDF document text
    • http://dodemul.mygamesonline.org/buzexudolumenozax.pdfIn PDF document text
    • http://ledukamu.iblogger.org/53715490870.pdfIn PDF document text
    • http://gadatoreneperil.mygamesonline.org/32337911032.pdfIn PDF document text
    • http://jafedaroz.iblogger.org/bayete_lyrics.pdfIn PDF document text
    • http://creditactive.info/83641119441igz3e.pdfIn PDF document text
    • http://tarekupi.scienceontheweb.net/accelerated_stability_testing.pdfIn PDF document text
    • http://tibelun.22web.org/minecraft_macbook_free.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
    • http://julisumuxolo.rf.gd/apotheken_umschau_februar_2020.pdfIn PDF document text
    • https://d064ede3-316f-4d13-8ec5-014b2136b3bd.filesusr.com/ugd/154db6_777bf65d72144e0c8cd20404a84b2583.pdf?index=trueIn PDF document text
    • http://xuxereda.rf.gd/hongo_entomopatogeno_metarhizium_anisopliae.pdfIn PDF document text
    • http://mimiwuzoxul.epizy.com/sondaje_vesical_en_neonatos.pdfIn PDF document text
    • http://nosirewelavof.epizy.com/nibibevapak.pdfIn PDF document text
    • http://ruxexevomu.rf.gd/12248087693.pdfIn PDF document text
    • http://wexugemo.epizy.com/58633698372.pdfIn PDF document text
    • https://eeff404e-5492-4914-a1d7-e39d1f35e6b2.filesusr.com/ugd/e58d70_d49ae57a0306468a8d8d557cf4345f75.pdf?index=trueIn 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_off000119bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x119BC 5288 bytes
SHA-256: 6eae829c4c1f4bbba7e09f7a21f369a1a3621421a2da8996467c5cbdbb2d964a
font_01_sfnt_off00012b92.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B92 11100 bytes
SHA-256: 992aa28dc64cc44c780a2b561532737629bf03d9b8c8af32d3722c7a8f88ece1
font_02_sfnt_off00015149.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15149 4324 bytes
SHA-256: a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f

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