Malicious PDF — malware analysis report

Static analysis result for SHA-256 b4967858cc9b86e0…

MALICIOUS

PDF

82.3 KB Created: 2021-02-25 06:04:19 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: f57d58588f0f0f78523c92cfa1ff2a58 SHA-1: 68a7bea6bf30053db6b407a090df8a0b7af9570a SHA-256: b4967858cc9b86e05f0a5eb272be7ef004e347a9cf274d8134b49065b71fec60
126 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates the PDF hosts numerous links pointing to disposable domains, suggesting a phishing or malware distribution scheme. One of the embedded URLs, 'https://seumenha.ru/123?utm_term=sword+art+online+alicization+rising+steel+tier+list+2020', is likely part of this lure.

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://seumenha.ru/123?utm_term=sword+art+online+alicization+rising+steel+tier+list+2020 PDF link annotation
    • http://circulshtangcalip.website/35015238382kll6v.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408190/normal_6028931698ed8.pdfIn PDF document text
    • http://xufamorazogubov.sportsontheweb.net/remington_700_sps_tactical_stock_upgrade.pdfIn PDF document text
    • http://tosefabebiribow.scienceontheweb.net/notakigubetebuluvo.pdfIn PDF document text
    • http://marketop.club/beburanuxogabowwnu0.pdfIn PDF document text
    • http://vowujebotoza.mywebcommunity.org/57152492427.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366398/normal_600a679b3377d.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4416332/normal_5fff3207150dc.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4480886/normal_6033e8acad253.pdfIn PDF document text
    • http://jekeluxuto.mywebcommunity.org/41301688316.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4374686/normal_5ff8ce41033b5.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/ragejufa/brigette_hyacinth_the_future_of_leadership.pdfIn PDF document text
    • https://s3.amazonaws.com/gajabedafot/free_online_collage_maker_templates.pdfIn PDF document text
    • http://zevusup.atwebpages.com/how_to_calculate_compound_interest_over_time_in_excel.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_off0000f679.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF679 5412 bytes
SHA-256: 2356200740570134bf972238822780df154f30a7aafe1304f343327848f0fdcc
font_01_sfnt_off000108f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108F7 10624 bytes
SHA-256: e88394364e184b6de889b916c3fb3b953fab246865bd3cf259fcdd2accdf8481
font_02_sfnt_off00012d47.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D47 4324 bytes
SHA-256: 0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333

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