Malicious PDF — malware analysis report

Static analysis result for SHA-256 5f24770d1051fcbf…

MALICIOUS

PDF

70.4 KB Created: 2021-02-14 04:10:31 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: a51a8e893b28a395e1b71bbc9d894799 SHA-1: ab2af2d63666e7c6711284af5d81c6977a96fd38 SHA-256: 5f24770d1051fcbf0c321d150c3e7a766f9b6a9a28805adffa64c2d8d29cde56
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which are hosted on disposable domains and appear to be part of a link farm, suggesting a phishing or malware distribution scheme. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of a malicious document designed to redirect users to potentially harmful content.

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
  • 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://leonvi.ru/wix?keyword=august+2014+algebra+1+regents+answers PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4416660/normal_6004a9c7a2cf2.pdfIn PDF document text
    • https://cdn.sqhk.co/tosuwukiwate/LgeOg8f/3287962155.pdfIn PDF document text
    • http://axecheat8.xyz/870920597415loms.pdfIn PDF document text
    • https://tigibivimibi.weebly.com/uploads/1/3/4/3/134344299/774255.pdfIn PDF document text
    • http://allieshouseofhope.com/dwts_season_29_cast_rumors39d2q.pdfIn PDF document text
    • http://c-advance.space/bajajixu5vqv.pdfIn PDF document text
    • http://lnstagramsecurity.net/buffalo_weather_report_7_dayv1ysi.pdfIn PDF document text
    • http://znakomstva18x.site/6104545828253jlx.pdfIn PDF document text
    • https://vedaputenada.weebly.com/uploads/1/3/5/3/135318287/tukorigesirewozute.pdfIn PDF document text
    • https://cdn.sqhk.co/boguzivipel/hfEhdfQ/vakuloboxekabaru.pdfIn PDF document text
    • https://cdn.sqhk.co/xegapanasa/g6gjcyA/88548039119.pdfIn PDF document text
    • https://taxupati.weebly.com/uploads/1/3/4/8/134891344/tuxaxisalanog.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4415543/normal_5fdbcdb6a637b.pdfIn PDF document text
    • http://limecash.xyz/conscious_sedation_guidelines_for_nurses53kjj.pdfIn PDF document text
    • http://nicepics.xyz/crossfire_wallpapers_hdijx5l.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4476436/normal_60272f02e13d4.pdfIn PDF document text
    • https://zaduguwage.weebly.com/uploads/1/3/0/8/130874015/miduxitaviw.pdfIn PDF document text
    • http://nakanilo.club/physics_today_2017x31md.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off0000d41c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD41C 5488 bytes
SHA-256: e659c58957e845b8ed35a21737cc45c722d7445017e502c4b9e0953d20f14d20
font_01_sfnt_off0000e6f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6F8 11668 bytes
SHA-256: 88ae7a4461e3f974121f5395548d5f619d03329a32b2576ed2462225760ad5fe

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