Malicious PDF — malware analysis report

Static analysis result for SHA-256 c33e656d0694727f…

MALICIOUS

PDF

76.5 KB Created: 2021-03-14 11:46:27 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 76b6da582e77d011647a9b7606607783 SHA-1: 7e79cb8e89d087537c5b53f2961aee7f4460366d SHA-256: c33e656d0694727f364b7aa118f4c950ea49b9bb572b6fb35547e4acd64c9832
126 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many pointing to disposable domains, suggesting a link farm designed to redirect users to malicious content. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a deliberate attempt to create a deceptive link structure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://leonvi.ru/123?utm_term=antietam+battle+guides
    • http://cashfree.store/vesarimopapukutafa9nz2m.pdf
    • http://discount50.pro/418473012517gz71.pdf
    • http://sevezor.scienceontheweb.net/34625066147.pdf
    • http://marketitaly.info/bhu_bsc_agriculture_syllabus94dpf.pdf
    • http://formblckr1.xyz/7338933510rrtcq.pdf
    • http://avtoshtorki.shop/94110509524f8wy3.pdf
    • http://gadetebes.sportsontheweb.net/gowexiwatalage.pdf
    • http://rirenanevigi.22web.org/passive_voice_reporting_verbs_explanation.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/e6484b4d-b933-4522-bf9d-7ffce0699c5b/is_disney_plus_available_on_samsung_smart_tv.pdf
    • http://tiguvazigavis.epizy.com/communication_barriers_and_how_to_overcome_them.pdf
    • https://uploads.strikinglycdn.com/files/e2fab3ab-b85e-4ad7-b9fc-7cfa1a020603/82080046587.pdf
    • http://nalumilejoburo.rf.gd/zaroluxolitanewapepataz.pdf
    • https://s3.amazonaws.com/nefunupu/6126863755.pdf
    • https://s3.amazonaws.com/vuraradaso/buretevav.pdf
    • http://pafokodufes.epizy.com/effect_of_air_pollution_on_human_health.pdf
    • https://uploads.strikinglycdn.com/files/9ef118c0-2981-49a8-b125-dd0794f843ff/how_long_is_maxcare_warranty.pdf
    • http://robopawize.epizy.com/76400944296.pdf
    • https://s3.amazonaws.com/xamibebulosaxug/derepelowujamekamajex.pdf
    • https://s3.amazonaws.com/wumodukubaru/top_10_angry_birds_games_for_android.pdf
    • http://xupikilagi.rf.gd/what_is_curriculum_in_education_essay.pdf
    • https://s3.amazonaws.com/napisakaluja/munifawiwenexozumeb.pdf
    • http://sefozutobikawu.epizy.com/reasoning_ability_books_free_download.pdf
    • http://ruwopepifip.rf.gd/niwafafol.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000eeb3.bin
ac3b0b230fe575cd3af14c5f944660bf4508a5e4053e7d2d842e23b7edf115cb		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEEB3 5176 bytes
font_01_sfnt_off0001003b.bin
3a435bfddb90191b5ec5e6e621d34fd3e7981c0ffa138d62d455f66fd46c6de3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1003B 10732 bytes

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