Malicious PDF — malware analysis report

Static analysis result for SHA-256 de93337897fc3efb…

MALICIOUS

PDF

98.9 KB Created: 2021-03-29 15:44:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 7c8469dd113cd231fa75cb61eb6d6c50 SHA-1: 7d92af1f54291bf8c789ffb7be30d2ed09225844 SHA-256: de93337897fc3efb76df0d582f6f81f0e1ee2bfe5f06ba9838ae0c4107ba3af9
156 Risk Score

Malware Insights

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

The PDF file contains a mass of external links, identified by the PDF_SEO_LINK_FARM heuristic, pointing to various PDF documents. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution. While no scripts were explicitly extracted, the structure suggests the document is designed to redirect users to potentially harmful content hosted on numerous domains.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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=types+of+antibiotic+resistance+pdf
    • https://cdn.sqhk.co/bitomasijelo/h0uMfYT/permanent_magnet_sheet_metal.pdf
    • https://cdn.sqhk.co/lozuzupadis/xAqtbii/15842476670.pdf
    • https://cdn.sqhk.co/banuluwopote/fNicO1K/affirmed_home_care_reviews.pdf
    • https://cdn.sqhk.co/pixukinoma/aRhiGij/what_do_crackles_in_your_lungs_mean.pdf
    • https://cdn.sqhk.co/vuvesanap/djh0dsY/fortnite_mini_games_creative_maps.pdf
    • https://cdn.sqhk.co/sepunaro/heppjgM/spider_solitaire_game_download_for_pc_windows_7.pdf
    • http://adanakebap.org/podebaxat71bh6.pdf
    • https://cdn-cms.f-static.net/uploads/4415929/normal_603edce206dc0.pdf
    • https://cdn.sqhk.co/lawikuto/DKjeljb/taradob.pdf
    • https://cdn.sqhk.co/kukisigafumi/gi5fngc/4724521916.pdf
    • https://dakokegeter.weebly.com/uploads/1/3/4/7/134723120/rapiwekiberu.pdf
    • http://help-copyrightviolationhelpcenter.com/83125285445hbu5g.pdf
    • https://cdn.sqhk.co/kekumumaxow/hJOagcs/red_passion_flower_care_tips.pdf
    • https://cdn.sqhk.co/natokaze/jahhlma/dafigomibofi.pdf
    • https://cdn.sqhk.co/jabosuve/PEmiggj/battute_da_buzzer.pdf
    • https://cdn-cms.f-static.net/uploads/4495551/normal_601585c1772ed.pdf
    • https://cdn.sqhk.co/tekunipifob/ibNjfI6/bedroom_furniture_sets_full.pdf
    • http://kanshoper.site/what_do_the_greek_letters_mean_in_sororitiesl077a.pdf
    • https://cdn.sqhk.co/sawibevas/jf5qSje/happy_birthday_sheet_music_flute.pdf
    • https://zijedizadof.weebly.com/uploads/1/3/4/6/134692085/zuluzutabefejil-tugibozebigi.pdf
    • https://cdn-cms.f-static.net/uploads/4409403/normal_5fd6636d2054c.pdf
    • https://cdn.sqhk.co/vapezuwe/7bOLUig/tilanud.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • 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_off000142e9.bin
a7595f0171fa178ef398f7d6fed9a1594adbdd4ef5e0586b49ca66d870100326		 pdf-font-stream PDF embedded font (sfnt) at offset 0x142E9 5308 bytes
font_01_sfnt_off0001550b.bin
2be34c3bfeee2bbc26e9cba2d7b73672b7c2c56bef730c2511ae24ece4ef9a05		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1550B 12192 bytes

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