Malicious PDF — malware analysis report

Static analysis result for SHA-256 f817aeeac1a0ad9c…

MALICIOUS

PDF

72.4 KB Created: 2021-09-26 12:12:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: c975e91a70ef68bea859d03073fc20eb SHA-1: d3ef08575ab52f846b92e4bcde91901fa8f093e2 SHA-256: f817aeeac1a0ad9ca6c8986f306a32c5500cc715fb2f02947ba5c5467ea0e653
126 Risk Score

Malware Insights

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

The PDF was flagged by multiple heuristics and a machine learning classifier as malicious. It contains numerous links pointing to a link farm hosted on disposable domains, indicating a phishing or malware distribution attempt. The presence of many distinct hosts and links per host suggests an effort to obscure the final destination or evade detection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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://repetitorebi.ge/userfiles/files/56879616594.pdf In PDF document text
    • http://www.britocunhaadvocacia.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/161422c05a5e79---76407345609.pdfIn PDF document text
    • http://veterinariomauracotti.it/userfiles/files/12088141399.pdfIn PDF document text
    • http://www.dialog-seversk.ru/jsplugins/ckfinder/userfiles/files/lonoriliken.pdfIn PDF document text
    • http://kayapalinakliyat.com/file/78052861714.pdfIn PDF document text
    • https://heritagelogs.com/wp-content/plugins/super-forms/uploads/php/files/ohar34ikh88qc8ed8umv8e5fep/gelelaleguguvemij.pdfIn PDF document text
    • http://appinaris.net/ckfinder/userfiles/publics/files/8099731257.pdfIn PDF document text
    • http://soskuwait.com/outscapes/admin/ckeditor/uploads/ck/files/9959688011.pdfIn PDF document text
    • http://adhunikjewellers.com/ckfinder/userfiles/files/30125762906.pdfIn PDF document text
    • http://longruiglass.com/ckfinder/userfiles/files/20210917_143643.pdfIn PDF document text
    • http://nikolalepojevic5.com/multimedia/file/79988637727.pdfIn PDF document text
    • https://drishtinetcom.in/FCKeditor/file/lukuzusitadupukov.pdfIn PDF document text
    • http://riccaassociati.eu/userfiles/files/90856680268.pdfIn PDF document text
    • http://biemmecommerciale.eu/userfiles/files/16679573211.pdfIn PDF document text
    • https://akamercedes.com/images/uploads/files/kibajuwegipewigiredijij.pdfIn PDF document text
    • http://autobedrijvenindex.nl/images/uploads/wilarajajowamifubokokeji.pdfIn PDF document text
    • http://hmsendo.pl/uploads/editor/file/6605435994.pdfIn PDF document text
    • https://clinicamanila.com/ckfinder/userfiles/files/kuroka.pdfIn PDF document text
    • https://patc.fr/imagesfile/1386108660.pdfIn PDF document text
    • http://manpukuorder.com/uploads/files/gufusivunivagubuwigevi.pdfIn PDF document text
    • http://makaroma.fr/upload/file/53378496949.pdfIn PDF document text
    • http://www.como-grup.ro/fisiere/file/lokesi.pdfIn PDF document text
    • http://dade666.com/userfiles/202109file/2021091723494770554.pdfIn PDF document text
    • http://www.driftime.ee/wp-content/plugins/formcraft/file-upload/server/content/files/1613b2b6b5cdce---11995892593.pdfIn PDF document text
    • http://vandientuchinhhang.com/upload/files/fedorudosarizorewo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=wrestling+revolution+3d+2k17+mod+downloadPDF 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_off0000b607.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB607 11320 bytes
SHA-256: 10a3bbaeeb97cca65136382e728bbe3baa7e499bd7ed2a2511e3cac1b3cce791
font_01_sfnt_off0000d0b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD0B2 16772 bytes
SHA-256: 7160d2875ce57611600854b6f0cec6fef0139d75a94bdde28cc12a645661b4a2
font_02_sfnt_off0000fb36.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB36 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1