Malicious PDF — malware analysis report

Static analysis result for SHA-256 fec2a04dc7ee2906…

MALICIOUS

PDF

79.2 KB Created: 2021-09-14 12:43:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 924320c1c503db9e79153fd490a35cdd SHA-1: 94df6d080bb69c6f3ad7addcf73db87f7907c34a SHA-256: fec2a04dc7ee290641842ab7a98e748df06e6cfb45fe9cfc1a5d93fadc2fcf7e
106 Risk Score

Malware Insights

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

The PDF contains a link farm hosted on disposable domains, a common tactic to obscure malicious URLs. The 'SE_PASSWORD_ARCHIVE_LURE' heuristic indicates the document likely instructs the user to open a password-protected archive, a method used to evade gateway scanning. The ML classifier strongly flagged this PDF as malicious, suggesting a high likelihood of malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 5

  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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://castilloexterior.org/ckfinder/userfiles/files/84978180150.pdf In PDF document text
    • http://c-six.it/userfiles/files/mepojekejiwifo.pdfIn PDF document text
    • https://refundsrefunds.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613900fdcbd2e---ruwoxenip.pdfIn PDF document text
    • http://automsystem.com/UploadFile/file/20210910082503244.pdfIn PDF document text
    • https://www.pferde-fuer-unsere-kinder.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613e09ecc00fb---peruk.pdfIn PDF document text
    • http://fishingas.com/userfiles/file/37440891767.pdfIn PDF document text
    • https://dolupin.com/calisma2/files/uploads/tovubidadite.pdfIn PDF document text
    • http://smlstripedbass.com/home/rock/public_html/ckfinder/userfiles/files/rolasejobiwimerudowixo.pdfIn PDF document text
    • https://fajanav.com/aym_image/files/vibunateke.pdfIn PDF document text
    • https://hoongnau.com/upload/files/zetufakepokesugiki.pdfIn PDF document text
    • http://chizclean.ru/files/fck/file/67103503845.pdfIn PDF document text
    • http://burchiellati.com/file_fck/file/90353439034.pdfIn PDF document text
    • http://cariboohose.com/userfiles/file/povisumifireju.pdfIn PDF document text
    • http://baigeleather.com/userfiles/file/37533988981.pdfIn PDF document text
    • http://express-service-auto.fr/ckeditor/ckfinder/userfiles/files/fulobizerisotixagijusu.pdfIn PDF document text
    • http://suvagcentr.ru/userfiles/files/fojubasagavutavewodi.pdfIn PDF document text
    • http://geotersrl.it/file/81825465823.pdfIn PDF document text
    • http://hrdiborice.cz/erucom1/files/files/wirixugavajuvoxepejereguw.pdfIn PDF document text
    • https://vegas-shop.net/uploads/files/77942445749.pdfIn PDF document text
    • http://barcelonahotel.vn/UpLoadFile/file/babitoxubanil.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=encrypted+apps+for+androidPDF link annotation
    • 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_off0000d1cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD1CC 17280 bytes
SHA-256: 06ad49d4afaaf9fec1c759a5095268d288d7299af4f6956546ec46afbbc6a866
font_01_sfnt_off0000febc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEBC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000116d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x116D3 10664 bytes
SHA-256: 62b3adc222f8667f3f99feb8767c5efde242a6f6748941e1141c7c6c4d52a676

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