Malicious PDF — malware analysis report

Static analysis result for SHA-256 21ba3bf8b585ab8a…

MALICIOUS

PDF

81.4 KB Created: 2021-09-17 03:25:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-04
MD5: ac27374e467cef5c15a5ea47734969fb SHA-1: 42c706559e05b462c2c7c7aef2545243ad77ed12 SHA-256: 21ba3bf8b585ab8a41b556253c1ba82bd6213ccacf57a16985e2b296869aab99
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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 https://smidgel.ru/uplcv?utm_term=can+you+retrieve+deleted+videos+from+your+phone PDF link annotation
    • http://metabolitplus.ru/files/file/37955035826.pdfIn PDF document text
    • http://xn--9p4b29dncp2cc6y.net/upload/fckeditor/file/vonek.pdfIn PDF document text
    • http://devison-matras.ru/upload/file/vadonoxejebuzabulotagonug.pdfIn PDF document text
    • http://ubestsports.com/imager/files/20210917065315.pdfIn PDF document text
    • http://xn--80affcyoc0ac1f6a.xn--p1ai/admin/modules/ckeditor/ckfinder/userfiles/files/56679038054.pdfIn PDF document text
    • https://www.hotel-restaurant-plainfaing.fr/ckfinder/userfiles/files/89525164912.pdfIn PDF document text
    • http://gamebonda.com/ckupload/files/5193345811.pdfIn PDF document text
    • https://crcnueva.naturasoftware.com/uploads/images/files/47135893704.pdfIn PDF document text
    • http://bmfjhjk.friend-match.com/upload/files/rowokapu.pdfIn PDF document text
    • https://gulfb2b.com/userfiles/file/43681512988.pdfIn PDF document text
    • http://bezpiecznamlodosc.org/files/file/7725235893.pdfIn PDF document text
    • https://clinicaabrahaoosta.com.br/ckfinder/userfiles/files/puvifowafivaxemafuz.pdfIn PDF document text
    • http://cgt-fo-csc.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16130672722822---74121168634.pdfIn PDF document text
    • http://agenziaimmobiliarecannavo.eu/userfiles/files/16417910498.pdfIn PDF document text
    • http://christopherdallo.com/file/bokuretolejunopepuwepis.pdfIn PDF document text
    • https://leuphuotcamap.com/uploads/image/files/depududuferozejiboman.pdfIn PDF document text
    • http://lnianemarzenie.pl/userfiles/file/72858021254.pdfIn PDF document text
    • https://budgetparking.ca/admin/uploads/file/gatomevolopamu.pdfIn PDF document text
    • http://www.combatsim.eu/wp-content/plugins/formcraft/file-upload/server/content/files/16143ae942c287---25338063538.pdfIn PDF document text
    • http://hoteldarim.ir/basefile/hoteldarimir/files/posafejavo.pdfIn PDF document text
    • http://balone.net/_upload/file///24388967327.pdfIn PDF document text
    • https://underworldgear.com/upload/users/files/89282542019.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_off0000d876.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD876 17916 bytes
SHA-256: 2e83df909bcb9d320bbb727ea24d083d55eb440394d1e3aeb553694bebe23152
font_01_sfnt_off00010650.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10650 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011e67.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E67 11076 bytes
SHA-256: 9ca16c65445f8fd2a35656092734b8629e005adeca8dfa48160106e678982f54

Open this report in the interactive analyzer, or submit your own file for analysis.