Malicious PDF — malware analysis report

Static analysis result for SHA-256 d18aaf88ee2fa62a…

MALICIOUS

PDF

67.3 KB Created: 2021-02-27 17:05:56 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 3b59708e2402c5c08857ba57ed121d71 SHA-1: b5172784fa45fdfab23173c502eb50e58d4e818a SHA-256: d18aaf88ee2fa62a6eaa1713011c89e6640ebdf3b37e54b4df782cea70ffa65a
126 Risk Score

Malware Insights

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

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many pointing to disposable hosting, suggesting a phishing or link-farming scheme. The document body, though heavily obfuscated, contains metadata related to '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-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://midufefew.ru/wix?keyword=persuasive+language+lets+focus+on+ethos+worksheet+answers PDF link annotation
    • https://cdn.sqhk.co/perikowep/4iigcjN/15820909971.pdfIn PDF document text
    • http://poxumanavofeboz.scienceontheweb.net/what_are_the_fuel_system_main_components.pdfIn PDF document text
    • http://mixutadumekaje.mypressonline.com/best_book_to_learn_python_coding.pdfIn PDF document text
    • http://freshmind.net/the_signal_and_the_noise_downloadznsm3.pdfIn PDF document text
    • http://kavelizopepi.mywebcommunity.org/xinafadavokiji.pdfIn PDF document text
    • http://fejekadiwoxobiz.getenjoyment.net/how_to_adjust_poundage_on_a_pse_compound_bow.pdfIn PDF document text
    • http://shopmzm.site/wild_magic_sorcerer_5eialjk.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4371248/normal_5fec5a6936503.pdfIn PDF document text
    • http://lololoj.sportsontheweb.net/whirlpool_conquest_refrigerator_parts_diagram.pdfIn PDF document text
    • http://doburepos.iblogger.org/information_about_school_foundation_day.pdfIn PDF document text
    • http://pokemonrivals.online/fezoluzeditiridanidawk5g37.pdfIn PDF document text
    • https://cdn.sqhk.co/febutatesu/iaFgd4f/10188091915.pdfIn PDF document text
    • https://cdn.sqhk.co/rujiwujik/hdgMqzy/6876572899.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://giredixilin.epizy.com/dovododajazaxo.pdfIn PDF document text
    • http://nabenejajoko.myartsonline.com/ejercicios_de_operaciones_combinadas_con_fracciones_2o_eso.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_off0000c743.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC743 5360 bytes
SHA-256: 72b0cc68df09f77ef6f74d5c9aef912581af09111afdb0d58d4157c4511334da
font_01_sfnt_off0000d992.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD992 10940 bytes
SHA-256: a57a449b4bcbaecbb455bd365dacdce9dfbff255edbf6574660aaaeb6ab1c97c

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