Malicious PDF — malware analysis report

Static analysis result for SHA-256 a5463eb3a8e60b05…

MALICIOUS

PDF

72.8 KB Created: 2021-09-18 03:26:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: b2dc83328cdaaea9b7ddef5a45b40925 SHA-1: 7e9140acd95fcdc533806bc416ca73a8d0779b8e SHA-256: a5463eb3a8e60b0598834e67afda675f298c618c419259876de480a096ed2539
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is a PDF containing embedded JavaScript, which is a common technique for executing malicious code. It also features a large number of external URIs, many of which point to disposable domains, indicating a link farm or redirection scheme. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

Heuristics 7

  • 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.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • 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://viadagio.be/userfiles/file/zurodonurawujugilone.pdf In PDF document text
    • http://files.ibiza-ferien.de/file/78429335927.pdfIn PDF document text
    • http://ferrocom-spb.ru/userfiles/files/robavemewofila.pdfIn PDF document text
    • http://chinawin-consult.com/userfiles/66929582892.pdfIn PDF document text
    • http://ancheng-medical.com/uploadfile/files/lufager.pdfIn PDF document text
    • http://ndt-tl.ru/upload/file/nivavidonupow.pdfIn PDF document text
    • http://kaizousha.com/js/upload/files/wisopasum.pdfIn PDF document text
    • http://tythb.cn/uploadfile/files/52436281108.pdfIn PDF document text
    • https://eternalbliss.net/file/80391159046.pdfIn PDF document text
    • https://dolupin.com/calisma2/files/uploads/lorazoxudo.pdfIn PDF document text
    • http://ankurgroups.com/userfiles/file/dutanubam.pdfIn PDF document text
    • http://oppedisanorobertosrl.com/userfiles/files/46640152292.pdfIn PDF document text
    • http://master-sign.ru/ckfinder/userfiles/files/66071528935.pdfIn PDF document text
    • https://cheeselicious.net/UserFiles/file/74834356698.pdfIn PDF document text
    • http://affordableadobe.com/ckfinder/userfiles/files/69104390617.pdfIn PDF document text
    • http://fxlcd.com/upload/file/vafewabaxakijefe.pdfIn PDF document text
    • http://shanghaiqingchen.com/upload/files/bozisaxunisejunebofubi.pdfIn PDF document text
    • http://xhzhengli.com/upload/seloxifixix.pdfIn PDF document text
    • https://rajakeempat.com/contents/files/felevanepunivit.pdfIn PDF document text
    • http://gusanhightec.com/userData/board/file/51747485134.pdfIn PDF document text
    • http://adhdadvisory.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b9cad9824b---492521733.pdfIn PDF document text
    • http://ticketsperiodico.com/galeria/files/56642412855.pdfIn PDF document text
    • http://maksimetall.ru/files/sazedugitifo.pdfIn PDF document text
    • https://jordan.si/dokumenti/file/gekoguzugawup.pdfIn PDF document text
    • http://inoxbienhoa.com/upload/files/tapukapovib.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=padosan+full+movie+1968+hd+1080p+online+watchPDF 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_off0000b663.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB663 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ce75.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE75 16776 bytes
SHA-256: b7547977e386165bfc87ec270dc63e23a657c145bd16bf175f9b609d21f23ade
font_02_sfnt_off0000f987.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF987 11756 bytes
SHA-256: 39843d574eb36c924b22ca2c7b81c383d7ed24db8ad8a98a3521824129a6a937