Malicious PDF — malware analysis report

Static analysis result for SHA-256 5f9073e2385b1110…

MALICIOUS

PDF

73.0 KB Created: 2021-09-26 01:52:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: b2ba145360ee6d66bb592bd0c85a958f SHA-1: f0fe7521cddb5b1dc5c84271cdb73c47bdca12b5 SHA-256: 5f9073e2385b111063a69a7dc410bc277dbfe0509fba36a4a0f9488e8aa1571b
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is identified as malicious by ClamAV and an ML classifier, and exhibits characteristics of a link farm. It contains a high number of embedded URLs pointing to various domains, suggesting a phishing or malware distribution campaign. The PDF structure and embedded links are indicative of a spearphishing attachment, likely intended to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

Heuristics 5

  • 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.
  • 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://oniceh.ru/uplcv?utm_term=robert+collier+pdf PDF link annotation
    • http://mastrodibaglio.it/userfiles/files/30454377050.pdfIn PDF document text
    • http://mstreatmentadvances.com/userfiles/files/junobudugojujadinuk.pdfIn PDF document text
    • http://lev-steklo.ru/userfiles/file/guguxene.pdfIn PDF document text
    • http://lifestyleufa.ru/wp-content/plugins/super-forms/uploads/php/files/dc20eef88efb4c58a7398dcf9d358216/12119836346.pdfIn PDF document text
    • http://www.dkmodels.net/ckfinder/userfiles/files/zogezajunugenititiz.pdfIn PDF document text
    • http://westpakusa.com/phpsites/vertical_living/uploads/file/leduwezafapezijiwujumuva.pdfIn PDF document text
    • http://thelonerangerfanclub.com/ckfinder/userfiles/files/buzenosovafasew.pdfIn PDF document text
    • http://mlsy.cz/images/file/files/kawako.pdfIn PDF document text
    • https://miltonmattox.com/userfiles/file/47312175574.pdfIn PDF document text
    • https://editora-arara-azul.com.br/site/admin/ckfinder/userfiles/files/99041413564.pdfIn PDF document text
    • http://koovappadyscb.com/ckfinder/userfiles/files/zonefafifegubatajamo.pdfIn PDF document text
    • http://webursitet.org/Files/file/fewekinufadonebomasazo.pdfIn PDF document text
    • http://comicpapyrus.com/wp-content/plugins/super-forms/uploads/php/files/7e66c84a100aefa59f8a2d1486b52b2e/xuvubexogozutimadamilas.pdfIn PDF document text
    • https://sindonis.com/userfiles/file/96703477329.pdfIn PDF document text
    • http://edituj.cz/res/file/56739592245.pdfIn PDF document text
    • http://moestuinwebshop.nl/userfiles/file/90458626560.pdfIn PDF document text
    • http://msslink.ru/userfiles/files/54830297138.pdfIn PDF document text
    • http://turbotechnik24.de/userfiles/file/54745036762.pdfIn PDF document text
    • http://uniquecharacters.com/upload/files/20297601665.pdfIn PDF document text
    • http://automsystem.com/UploadFile/file/20210923070003732.pdfIn PDF document text
    • http://ximangsongthao.com.vn/app/webroot/uploads/files/11054446103.pdfIn PDF document text
    • http://0851gay.org/userfiles/202109file/2021092519080970554.pdfIn PDF document text
    • https://swiz.eu/files/editor/rovekimazazaxexo.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_off0000ba49.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBA49 17468 bytes
SHA-256: 20be39817dc12c6bef387e4e6c9c5b6c1bf46996fc951ad6ddcdc1eb21a0e1ac
font_01_sfnt_off0000e702.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE702 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000ff19.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF19 10364 bytes
SHA-256: a52b9e2a01325a38eb19d2ea5944c3a3915e0a20af4b624ab617819c4fc4a017