Malicious PDF — malware analysis report

Static analysis result for SHA-256 363baac8b5543493…

MALICIOUS

PDF

70.7 KB Created: 2021-02-07 16:32:28 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-04-25
MD5: aa44b31d564248a0efe953e3721c7757 SHA-1: f3b8a0aadfad6fffcfeee59fee694a639a90dae9 SHA-256: 363baac8b5543493e26d93600fa184cacf9dad79f0268bdc01134cf33fcaf0ca
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, and is flagged by ML classifiers and ClamAV as malicious. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a high likelihood of it being used for phishing or malware distribution by linking to many external sites. The document body, though heavily obfuscated, contains keywords related to 'crossword app answers nuts', suggesting a lure to disguise malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://maypoin.ru/wb?keyword=crossword%20app%20answers%20nuts PDF link annotation
    • http://bhd-management.space/reporting_cronbach_s_alpha_in_tablenn6a9.pdfIn PDF document text
    • https://cdn.sqhk.co/xadowififux/jqgjXU1/digenuniguretivapuwito.pdfIn PDF document text
    • http://duplicwcnj.space/descargar_fullmetal_alchemist_brotherhood_megaor5mp.pdfIn PDF document text
    • https://cdn.sqhk.co/mopewedote/jhk08Li/horse_runs_over_woman_houston.pdfIn PDF document text
    • http://zabavnyi-slon.ru/70344515443h0b4x.pdfIn PDF document text
    • https://cdn.sqhk.co/kifuzopeko/fXuZjbf/1515486243.pdfIn PDF document text
    • https://cdn.sqhk.co/vunelebu/BDhjy30/nascar_monster_energy_race_today_what_channel.pdfIn PDF document text
    • http://fuckfrsky.com/omegle_tv_appe02qq.pdfIn PDF document text
    • https://cdn.sqhk.co/kigaratak/gjihchb/82456000147.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4392470/normal_5fd295a320941.pdfIn PDF document text
    • https://cdn.sqhk.co/nokotadi/g6L8jai/98707977001.pdfIn PDF document text
    • https://cdn.sqhk.co/vugomupuzisa/eByheje/43510137506.pdfIn PDF document text
    • http://tranquils.space/lijigirofewegaga91p3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4472204/normal_601bdd58e8718.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://semisoriguregix.epizy.com/tigozazezoturefumiwa.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_off0000d954.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD954 4916 bytes
SHA-256: 345f226447970213c7ef145dc398009cba239a418b8398b05377df88a0a51579
font_01_sfnt_off0000ea27.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA27 10560 bytes
SHA-256: eb2eeaaa1deeb05807d8f86747ed8cd0897b7737fa8214cbdb8045ba9d2bcc0f

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