Malicious PDF — malware analysis report

Static analysis result for SHA-256 7bdf95a512860e82…

MALICIOUS

PDF

69.1 KB Created: 2021-03-21 00:03:11 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-28
MD5: 2b5bc754c0e1d7ea0fb049aec409a347 SHA-1: 9e83a0550b9a41aca5599aeb2e67255876ceb403 SHA-256: 7bdf95a512860e825cf396ed2c21caf714ddff4ebfcd619061b8919ccbea4877
126 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains a large number of embedded URIs, many of which point to disposable hosting or link farms, suggesting an attempt to distribute malicious content or phish for credentials. The document body is heavily obfuscated and contains metadata from wkhtmltopdf, indicating it was likely generated programmatically to host these links.

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://xezojetit.ru/wix?keyword=god+is+big+enough+rubber+bracelet PDF link annotation
    • http://argo-tourism.com/heart_project_ideas_for_school11uj8.pdfIn PDF document text
    • https://cdn.sqhk.co/padixemugex/wwbggUS/cooking_games_ice_cream_banana.pdfIn PDF document text
    • https://cdn.sqhk.co/watagovu/cJTD6gh/six_guns_gang_showdown_mod_apk_data_download.pdfIn PDF document text
    • https://cdn.sqhk.co/zupodejadofe/igmjbxJ/koxorijozipuriw.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4424672/normal_60466aed78970.pdfIn PDF document text
    • https://cdn.sqhk.co/dewufidabo/icVXhgw/rolalusapixinekenil.pdfIn PDF document text
    • http://policyhelpcenter.com/ludusafuzofokumeferafejuf87n4.pdfIn PDF document text
    • https://cdn.sqhk.co/runudori/ihhDggN/43756035034.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4482191/normal_6025b3b6e7702.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4414352/normal_605099b14564f.pdfIn PDF document text
    • https://cdn.sqhk.co/dofowaduz/jdDidia/zubopat.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4448743/normal_601b85402496d.pdfIn PDF document text
    • http://info-pages.ru/sesavalegisisalomutosevz8nd8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366327/normal_6031d45e82090.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://wotimadugol.epizy.com/the_real_book_of_real_estate_audiobook.pdfIn PDF document text
    • http://zekaroja.epizy.com/pubg_mobile_wallpapers_free.pdfIn PDF document text
    • http://fefasowuri.rf.gd/china_visa_online_form.pdfIn PDF document text
    • http://tisoparumunezud.epizy.com/funubinev.pdfIn PDF document text
    • http://vefelazubogimew.rf.gd/49734972677.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_off0000cf34.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF34 5372 bytes
SHA-256: 9e02e5b4d0b75ce1d530af659abb44516d3c09a6c8f59873fcda00edf98f20cd
font_01_sfnt_off0000e171.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE171 11232 bytes
SHA-256: bf84ed9cbeb3227e6c19c55697d4bb03c1db8fdcf5b340b592e09fe5534e912b

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