Malicious PDF — malware analysis report

Static analysis result for SHA-256 1d5930983aa53a7a…

MALICIOUS

PDF

78.7 KB Created: 2021-03-18 08:57:14 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0752da980a6f1888a7e8f78dfb3cde36 SHA-1: d699ba5c515d3fd3b2b72abb822087a816095af8 SHA-256: 1d5930983aa53a7a24dfa5c661372c8093a9290608026bea76b859919f5a5d1e
126 Risk Score

Malware Insights

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

The PDF document was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many pointing to disposable domains and potentially malicious content, indicating a link farm or phishing lure. The document body, though heavily obfuscated, contains references to wkhtmltopdf and a date, suggesting it was generated programmatically to host these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://leonvi.ru/award?keyword=the+traditional+bowyer+s+bible+volume+3+pdf
    • http://xaredazisom.mywebcommunity.org/chuyn_file_b_li_font.pdf
    • http://afterdealer.pro/2_look_oll6fqtv.pdf
    • http://gepopusoka.mypressonline.com/qualified_audit_report_of_any_company.pdf
    • http://gonzo-3d.com/2002_ford_explorer_sport_trac_transmission_fluid_capacityieh20.pdf
    • http://vumajuzatijerak.getenjoyment.net/dekixujugerudujide.pdf
    • http://lavkavkusa.store/here_comes_the_sun_baritone_ukulele_chords47gvu.pdf
    • https://pawonojureva.weebly.com/uploads/1/3/4/5/134522231/putanavutevoj.pdf
    • http://tixaman.scienceontheweb.net/using_moles_to_count_atoms_worksheet_answer_key.pdf
    • http://geosen.net/77941359038ttk6b.pdf
    • http://snegny.com/54820508271b47mi.pdf
    • http://vash-komfort5.ru/what_is_a_geographical_map26ogi.pdf
    • https://lopuvekire.weebly.com/uploads/1/3/0/8/130813144/1038300.pdf
    • http://ing-jobs-opportunities.com/lucky_block_minecraft_ps4r39h1.pdf
    • http://erethiztzj.space/mahalaxmi_calendar_sep_2019hoajt.pdf
    • http://edarudost.online/innovative_strategies_in_teaching_sciencew7lbl.pdf
    • https://ledasunutine.weebly.com/uploads/1/3/0/8/130814672/9107593.pdf
    • http://ch-redirect.icu/rokobukapesca5fs.pdf
    • https://watilokid.weebly.com/uploads/1/3/1/8/131856522/9105321.pdf
    • https://wapexuji.weebly.com/uploads/1/3/5/3/135329723/fotilalenogomulir.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://s3.amazonaws.com/legesiliv/sense_sensibility_and_snowmen_summary.pdf
    • https://s3.amazonaws.com/fejififimaketo/hodder_gcse_biology_textbook_answers.pdf
    • http://bolirazebaf.myartsonline.com/47927372049.pdf
    • https://s3.amazonaws.com/xujitezu/7562825269.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e42e.bin
638fdc247ddc0c9c1b514a6b3985abf7a622a4f31fabf842919228839361c103		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE42E 5668 bytes
font_01_sfnt_off0000f755.bin
a095289e8c5142e4ed1e148f263aba025aecda5a63019306c557303cfb1573ed		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF755 11796 bytes
font_02_sfnt_off00011e7c.bin
1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11E7C 4324 bytes

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