Malicious PDF — malware analysis report

Static analysis result for SHA-256 84ec211a5d1a225b…

MALICIOUS

PDF

76.7 KB Created: 2021-03-05 12:55:10 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: c0eb109a81b9b354e22b8c9a9b8090ae SHA-1: f1a7d1f64b139a463d218eda648108b10b427ef1 SHA-256: 84ec211a5d1a225b9329d417e6e09fcd7125b008c1aef63cdde7af0a543284b1
126 Risk Score

Malware Insights

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

The file is identified as a malicious PDF by multiple heuristics and a machine learning classifier. It contains numerous embedded URLs, many of which are part of a link farm hosted on disposable domains, suggesting a phishing or malware distribution scheme. The presence of external URIs and the 'link farm' heuristic indicate an attempt to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://pelibifir.ru/strik?utm_term=ponniyin+selvan+tamil+pdf+free+download PDF link annotation
    • https://kigazodiraju.weebly.com/uploads/1/3/4/6/134678535/cb0df35b.pdfIn PDF document text
    • http://dronextactical.xyz/calories_dunkin_donuts_bagel7mo70.pdfIn PDF document text
    • https://cdn.sqhk.co/xederebat/6l0SRLb/dibawugaxopupokud.pdfIn PDF document text
    • https://sozawozoxo.weebly.com/uploads/1/3/4/5/134509422/4328575ca68cb.pdfIn PDF document text
    • https://cdn.sqhk.co/mewixamok/igw1LoC/vuwiveninabajojitadoki.pdfIn PDF document text
    • https://cdn.sqhk.co/likafupat/hdihgjV/13051387524.pdfIn PDF document text
    • http://akvatehnika74.ru/tukedb22p6.pdfIn PDF document text
    • http://com-signto2.xyz/20736028853mlfes.pdfIn PDF document text
    • http://stickerrus.ru/google_sound_amplifier_appq7v43.pdfIn PDF document text
    • https://cdn.sqhk.co/bupitagalir/cKonvid/mozavenigulezoliwemu.pdfIn PDF document text
    • http://mozovurezet.iblogger.org/bumotusiterapamizidu.pdfIn PDF document text
    • https://cdn.sqhk.co/nawakema/hjx1hgp/vesetifojozakorekematawe.pdfIn PDF document text
    • http://didexuzixuwafa.iblogger.org/grammar_english_spanish_oxford.pdfIn PDF document text
    • https://rumikupim.weebly.com/uploads/1/3/5/3/135310872/vusop.pdfIn PDF document text
    • http://dronextactical.xyz/560478344246drvc.pdfIn PDF document text
    • http://playmarket-online.com/99268484490x6hie.pdfIn PDF document text
    • https://cdn.sqhk.co/nofatazor/0ij19ij/53628973907.pdfIn PDF document text
    • http://goodik.fun/98684070613ohdva.pdfIn PDF document text
    • http://letuxegesilem.iblogger.org/share_sale_agreement_template_australia.pdfIn PDF document text
    • http://raisinshub.club/nelewawedozutyemzr.pdfIn PDF document text
    • http://revershjtb.site/zagg_rugged_book_helpy64e9.pdfIn PDF document text
    • https://cdn.sqhk.co/netimawifes/ihHzf7k/26125443303.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000db26.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB26 5440 bytes
SHA-256: 781891fd7a49909d164554df27eedb5221396bc3e73f3c339fad2a0f6cb13bd3
font_01_sfnt_off0000edb1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDB1 9932 bytes
SHA-256: 3af929a3c5bac6931565bbfe6332ce627dda252591bb3c4568354dfbb743ebc9
font_02_sfnt_off00011010.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11010 16172 bytes
SHA-256: 461a1578f80084b2f2ca998a6e716936969cc9b33b2976d66eaaa57f6abee57a

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