Malicious PDF — malware analysis report

Static analysis result for SHA-256 e59861f337d59be9…

MALICIOUS

PDF

74.7 KB Created: 2021-09-17 04:55:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 3655143fda04aebbd2c6d3fb5cabe16e SHA-1: f22e639fd32feccdd769f895b532f8094b36e3fc SHA-256: e59861f337d59be9f89bc417a6b93d43591cc89a9d4d0072b01c4fedc1a8a071
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, a common technique for executing malicious code within documents. The ML classifier and ClamAV detection strongly indicate malicious intent. The embedded JavaScript likely redirects the user to one of the numerous external URLs, which are part of a link farm, potentially for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

Heuristics 6

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://allytemp.ru/uplcv?utm_term=ros+new+cheat PDF link annotation
    • http://maiodi.com/userfiles/files/jojuduzu.pdfIn PDF document text
    • http://radio-salsa.com/php/rs/filesupload/file/84162222664.pdfIn PDF document text
    • http://www2.grupoksl.com.br/js/ckfinder/userfiles/files/fepilafagesatu.pdfIn PDF document text
    • http://maytinhdalat.vn/images/uploads/files/88314486219.pdfIn PDF document text
    • http://hoangduy.vn/vn/files/91271988272.pdfIn PDF document text
    • http://massiimo.com/piceditor/file/18656715686.pdfIn PDF document text
    • https://baptistfriends.org/media/31679179338.pdfIn PDF document text
    • https://podereilmontaleo.it/writable/public/userfiles/file/17327407116.pdfIn PDF document text
    • https://yukkumpulgroup1.com/contents/files/lekaduvusukasibojimegus.pdfIn PDF document text
    • https://labelmarket.eu/data/file/maraxepuzazonapejiwe.pdfIn PDF document text
    • https://cantarefides.ro/admin/userfiles/file/dozetinobebodafikagan.pdfIn PDF document text
    • https://petribax.nl/userfiles/file/96540936599.pdfIn PDF document text
    • http://viettelhaiphong.me/data/dulieu/files/8614456334.pdfIn PDF document text
    • https://ta-taiwan.com/app/webroot/userfiles/files/vanezesejeko.pdfIn PDF document text
    • http://pspectr.ru/userfiles/file/87165632663.pdfIn PDF document text
    • http://aibasylhet.edu.bd/app/webroot/ckfinder/userfiles/files/86241584239.pdfIn PDF document text
    • http://studio70.eu/userfiles/files/66139466480.pdfIn PDF document text
    • https://sportsht.com/userfiles/file/40454167090.pdfIn PDF document text
    • http://rrarental.org/upload/file/rafeguxapo.pdfIn PDF document text
    • https://domilot.com/uploader/files/68529714373.pdfIn PDF document text
    • http://kubkao-kubpla.com/userfiles/files/vofevi.pdfIn PDF document text
    • http://123podkrovie.sk/editor_uploads/files/kolafukimibiwiwifavo.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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c337.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC337 16788 bytes
SHA-256: f64e1ba5274440009946a03b009a00c5f7cc0a4eb04ca50d3b045872aaaa8597
font_01_sfnt_off0000ee7b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE7B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010692.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10692 10220 bytes
SHA-256: 3471638035fb646ed7c192b1206bd8e70818fb1b5db2f32a64893ec464503087

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