Malicious PDF — malware analysis report

Static analysis result for SHA-256 973c36f8fe628e56…

MALICIOUS

PDF

73.5 KB Created: 2021-02-18 22:12:45 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 4ca63c39a644539677960e5712eb04e5 SHA-1: fcf06e214180fc196f86e480ab51c9dae646d39d SHA-256: 973c36f8fe628e565ab025d77aa038e2075bfc364e2f0349cc5999d962026927
184 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains embedded links that point to known malicious redirector infrastructure, as indicated by the PDF_MALICIOUS_REDIRECTOR_LINK heuristic. The ML classifier also strongly flagged this PDF as malicious. The document body is heavily obfuscated, but the presence of multiple links to disposable hosting suggests an attempt to lure users to malicious content, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://yafferge.ru/strik?utm_term=what+does+private+equity+do In PDF document text
    • https://cdn-cms.f-static.net/uploads/4450041/normal_6025296241643.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4366042/normal_60030070bf09a.pdfIn PDF document text
    • http://xepuvibigin.22web.org/c._a._t_full_form.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4448985/normal_5ffc5f24e2bd4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383916/normal_5fd7b24c12df7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369935/normal_602089bcae190.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4411709/normal_6011603e094fb.pdfIn PDF document text
    • https://cdn.sqhk.co/wobuwaseja/jds8kre/hang_gliding_airplane.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368243/normal_600a7572173a1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380213/normal_5fdc2ad23b41e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4445877/normal_601ae7880a1c7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4477173/normal_600d41cfdc3bd.pdfIn PDF document text
    • https://cdn.sqhk.co/jigitovewuk/fjghhgd/3662572753.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365576/normal_60103986dd4a9.pdfIn PDF document text
    • https://cdn.sqhk.co/gusiloxi/gegciiX/81761561187.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://wonegesaf.epizy.com/ccna_data_center_dumps.pdfIn PDF document text
    • http://pixezoki.rf.gd/landing_page_react_template_free.pdfIn PDF document text
    • http://defozuwonig.rf.gd/aitken_spence_plc_annual_report_2019.pdfIn PDF document text
    • http://duzifif.epizy.com/71980586418.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e177.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE177 5316 bytes
SHA-256: bd8c2e59120374ec9db28463f8741c42c90d33abadc529d187b741ea3f736f5b
font_01_sfnt_off0000f395.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF395 11068 bytes
SHA-256: 165e509a325b5a75a5fb3b2fc946a1040bb6cfe6d5bba483bc6788fcb982a4e9

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