Malicious PDF — malware analysis report

Static analysis result for SHA-256 c0d05f37128e241f…

MALICIOUS

PDF

76.1 KB Created: 2021-09-10 07:29:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 91ad90efc1bc8d6f9b2f3d8265ba9a1c SHA-1: 97943505ebe4f1958e50db097596e3e83e63df1f SHA-256: c0d05f37128e241f7aba103e901a06772ac76d52c976f83f818295c808fbb05f
66 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains a high number of embedded links pointing to various domains, many of which appear to be disposable, as indicated by the 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic. The ML classifier also flagged this PDF as malicious. The primary attack pattern involves directing users to a link farm, which is a common technique for distributing malware or conducting phishing attacks.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

Heuristics 4

  • 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://casier-a-bouteilles.com/file/lorumepubetifatase.pdf In PDF document text
    • http://sculecuacumulator.ro/app/webroot/files/userfiles/files/rusewesorewexo.pdfIn PDF document text
    • http://files.ibiza-ferien.de/file/19999832670.pdfIn PDF document text
    • http://brodart01.com/wp-content/plugins/super-forms/uploads/php/files/5n921l1t1ceamc27f6m09qel90/mexadofig.pdfIn PDF document text
    • http://tamtamphat.com/upload/files/65446848308.pdfIn PDF document text
    • https://sassanoproperties.com/FCKeditor/file/63236483278.pdfIn PDF document text
    • http://huntland.hu/upload/file/vomupuribotisusuvos.pdfIn PDF document text
    • http://cosyromania.com/media/file/givinikuvevewejeza.pdfIn PDF document text
    • http://xn----dtbsgbucafmmaf.xn--p1ai/servimages/editor/files/52945636201.pdfIn PDF document text
    • http://murzilka.biz/images/uploads/file/nunelitaf.pdfIn PDF document text
    • http://coumert.com/images/file/18859002720.pdfIn PDF document text
    • http://xn--80aaaaadfwa5aftjhxrkcrg8iwc.xn--p1ai/pict/file/24686323441.pdfIn PDF document text
    • https://mediaskills.rs/files/gojukalane.pdfIn PDF document text
    • http://lamexmarket.com/uploads/files/86701031977.pdfIn PDF document text
    • http://www.lentilles-progressives.fr/wp-content/plugins/formcraft/file-upload/server/content/files/161323b68f3d16---65972694515.pdfIn PDF document text
    • http://szilasfood.hu/pic_upload/files/13752474393.pdfIn PDF document text
    • https://partetesal.ir/data/file/fudatapibaluzufawul.pdfIn PDF document text
    • https://ozora.schaffsen.com/contents/file/10957035922.pdfIn PDF document text
    • http://sirinthepgroup.com/userfiles/file/67074127264.pdfIn PDF document text
    • https://pepinieramontana.ro/ckfinder/userfiles/files/75453804320.pdfIn PDF document text
    • https://altaamir.ipixpms.com/Rapport/public/assets/ckfinder/userfiles/files/3561403836.pdfIn PDF document text
    • http://bn-biz.com/userData/board/file/tumimejaje.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=braun+and+clarkePDF 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_off0000c9e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC9E9 10132 bytes
SHA-256: f9825882235c5f4e96fc46d975e2adf78039026fcf409abaf27d87764bc1d65b
font_01_sfnt_off0000e0a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0A4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f8b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8B6 16724 bytes
SHA-256: 62c86266d986957f90c867598136618b58fe7d9a5c1d4dd6502e6fd6f6b36648

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