Malicious PDF — malware analysis report

Static analysis result for SHA-256 b916fcc469339bfb…

MALICIOUS

PDF

75.4 KB Created: 2021-04-06 18:06:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-10
MD5: 21d6c0fcd3250cc669d147c431c4edf4 SHA-1: ad9594da4d4ab1fbbc53c6bc3bcb0e5c45ea087f SHA-256: b916fcc469339bfb669b7d8e9602c36887e06e1549ee87bbf0397274572bd0ef
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to disposable domains, indicating a link farm designed to redirect users. Heuristics like 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'ML_NYX_PDF_MALICIOUS' strongly suggest a malicious intent, likely phishing or malware distribution. The ClamAV detection further confirms its malicious nature, classifying it as 'Pdf.Phishing.Trojan'. No scripts were extracted, but the primary attack pattern is the distribution of malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://kuzutuzo.ru/award?keyword=credit+suisse+logo+pdf PDF link annotation
    • https://cdn.sqhk.co/baxorurifina/thix1hg/jimmy_john_s_gourmet_sandwiches_near_me.pdfIn PDF document text
    • http://zodatowafe.getenjoyment.net/3d_animation_software_for_free_download_full_version.pdfIn PDF document text
    • http://bit-ipo.ru/conic_sections_problems_and_answersknztc.pdfIn PDF document text
    • http://svoydvalend.xyz/20718563936wf2ro.pdfIn PDF document text
    • http://juwupexutaval.mywebcommunity.org/79547627197.pdfIn PDF document text
    • https://rirulejirosajis.weebly.com/uploads/1/3/4/3/134320684/ginogeguli_verowolexe_wivese_newipipidef.pdfIn PDF document text
    • http://worldworkbook.com/13477463789wwcw1.pdfIn PDF document text
    • http://boforotaje.mywebcommunity.org/how_much_does_a_500ml_plastic_water_bottle_weight.pdfIn PDF document text
    • https://nulokumex.weebly.com/uploads/1/3/3/9/133999188/xoxijotumabe.pdfIn PDF document text
    • https://cdn.sqhk.co/tekunipifob/1igwnjg/head_action_soccer_world_cup_2014.pdfIn PDF document text
    • http://store50off.info/16717917426d0yrr.pdfIn PDF document text
    • https://rimuzomidaz.weebly.com/uploads/1/3/4/3/134353295/jukif.pdfIn PDF document text
    • https://fenazimo.weebly.com/uploads/1/3/4/4/134437137/dilaned.pdfIn PDF document text
    • https://kogoporerosuf.weebly.com/uploads/1/3/5/3/135322240/2500499.pdfIn PDF document text
    • http://abwaab.su/math_kangaroo_canada_2016_answersiebis.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://696f1bd8-06c3-47a7-a8f7-e83e17ec8d18.filesusr.com/ugd/5ad03d_132d5cc4115544759f99f600223b8e9f.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/wonumafubij/how_to_use_denture_adhesive_powder.pdfIn PDF document text
    • https://s3.amazonaws.com/ruzaganog/91488852938.pdfIn PDF document text
    • https://s3.amazonaws.com/jiwotarotavuz/europass_cv_template_greek.pdfIn PDF document text
    • http://palexibibiw.atwebpages.com/6563353796.pdfIn PDF document text
    • https://19f621d4-ab03-49b5-bf1d-c78de40104d4.filesusr.com/ugd/bc84a3_dcb49c798e5740fb92d1e8a05674f3c1.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/xowasosuf/63910202477.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_off0000e7c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7C0 4904 bytes
SHA-256: a50a615436ce4d35dedd35876e3ab297b79e648e2cbe0e625a3303a7ba159172
font_01_sfnt_off0000f881.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF881 11788 bytes
SHA-256: 322048f7f91d162409d9afde665f125dcf274c6b9b9d05b9b60407773272e357

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