Malicious PDF — malware analysis report

Static analysis result for SHA-256 9326d5c6b44831a4…

MALICIOUS

PDF

78.8 KB Created: 2021-09-22 12:06:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: c3710a29f744b1905d963dbcedebd7f2 SHA-1: e8c8ecee0493b433ff11993223dee62bb33bcb82 SHA-256: 9326d5c6b44831a46881c83834dee9de3fde30be78f92468008730a5d93f2b8f
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs pointing to a link farm, indicating an attempt to redirect users to potentially harmful sites. While no scripts were explicitly extracted, the nature of the PDF and its embedded links strongly suggests it's designed to facilitate malicious redirection, likely as part of a phishing campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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 http://kimsanghun.com/upload/userfiles/file/20219151547429827.pdf In PDF document text
    • https://www.die-umzugsfabrik.com/wp-content/plugins/formcraft/file-upload/server/content/files/161422ace5d6fe---gatovatagop.pdfIn PDF document text
    • http://ckpak.com/fckeditor/userfiles/file/kunonitijezojujizedodis.pdfIn PDF document text
    • http://www.britocunhaadvocacia.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/1612f0981a1a09---segexinu.pdfIn PDF document text
    • http://www.awakohchang.com/image/upload/File/ulot.pdfIn PDF document text
    • http://goghepcacloai.com/media/ftp/file/76167499854.pdfIn PDF document text
    • http://chinahongji.com/d/files/bunuf.pdfIn PDF document text
    • http://se-ty.ru/uploads/userfiles/file/tavukiwujasapifiwofegujov.pdfIn PDF document text
    • https://atarentacarburdur.com/userfiles/file/13834182289.pdfIn PDF document text
    • https://cissud.it/uploads/ck_editor/files/nabarepafopuvidotitofopob.pdfIn PDF document text
    • https://optical-axis.com/uploads/files/202109201328569935.pdfIn PDF document text
    • https://myphi.biz/nbloom/fckuploads/file/tajanozuzeru.pdfIn PDF document text
    • http://onlytech-tunisie.com/userfiles/file/visitakiwuvuf.pdfIn PDF document text
    • http://keystoparadise.com/userfiles/files/43756442095.pdfIn PDF document text
    • http://urparitet.ru/admin/ckfinder/userfiles/files/piwonozodalifup.pdfIn PDF document text
    • http://drapa-technika.cz/UserFiles/File/26092876873.pdfIn PDF document text
    • http://laulumaja.fi/ckfinder/userfiles/files/88646514350.pdfIn PDF document text
    • http://utuin.net/files/fckeditor/file/11720380895.pdfIn PDF document text
    • https://www.medicalart.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1613151ab003d7---95095232971.pdfIn PDF document text
    • http://jjw-led.com/userfiles/file/42810866591.pdfIn PDF document text
    • https://endobible.com/userfiles/file/mejofovug.pdfIn PDF document text
    • http://stefanourso.com/public/userfiles/file/jivexufusinebodisobefuj.pdfIn PDF document text
    • http://studiocinti.eu/userfiles/files/geduwazaxesevu.pdfIn PDF document text
    • https://heuresromantiques.com/upload/files/lajiladamivad.pdfIn PDF document text
    • https://nakatarikaszel.pl/app/webroot/userfiles/file/72476491637.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=how+to+record+call+in+redmi+note+9PDF 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_off0000cec2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCEC2 17700 bytes
SHA-256: 48b5ee2949c916d8f6df0a5237c78018b2cb8dc4f25cb8ef0a03a49003da369b
font_01_sfnt_off0000fccb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCCB 10608 bytes
SHA-256: 0024908db0410350db560122745c41e3b98e431a70f36714bcb396702fece01e
font_02_sfnt_off00011508.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11508 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1