Malicious PDF — malware analysis report

Static analysis result for SHA-256 451d8e10dcf43b19…

MALICIOUS

PDF

81.7 KB Created: 2021-09-10 13:55:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: b1d9095ea4f1fe5bc3a0f1a4bca07970 SHA-1: 8a66ca665ce244514531459c9ccc810823f8d816 SHA-256: 451d8e10dcf43b198bf25f5d5871d3ef30c930bd81186248ac678f19e51fb463
74 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to disposable domains. The ML classifier strongly indicated maliciousness, and the PDF_SEO_DISPOSABLE_LINK_FARM heuristic confirms the presence of a link farm on disposable hosting. The embedded JavaScript likely facilitates the redirection to these malicious sites, potentially for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

Heuristics 5

  • 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.
  • 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 http://hyundaihungthinh.com/uploads/images/files/23787335472.pdf
    • http://auksozvynas.lt/userfiles/file/tukofek.pdf
    • https://actionsporting.com/userfiles/files/zutufokevumubowu.pdf
    • http://onnetsolution.in/userfiles/file/73510617460.pdf
    • https://ourcampuswindow.com/ckfinder/userfiles/files/padefedeje.pdf
    • http://www.teeintact.com/admin/fckeditor/editor/filemanager/connectors/php/img/file/pexukato.pdf
    • http://sun-eko.eu/files/file/sijalisilekirijevomezapu.pdf
    • http://www.neoneophytou.com/ckfinder/userfiles/files/7807888459.pdf
    • http://thuexedanang247.com/uploads/image/files/kevitalitegilupu.pdf
    • http://tradotel-riviera.com/file/86071494754.pdf
    • http://linpus.com/app/webroot/userfiles/files/28825157382.pdf
    • http://www.thediethub.in/wp-content/plugins/formcraft/file-upload/server/content/files/161327087a2e5d---87475603489.pdf
    • http://ylpcl.com/ckfinder/userfiles/files/94518342287.pdf
    • http://pulsrmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134a657be291---dajewug.pdf
    • http://historico.uts.edu.co/portal/app/ckfinder/userfiles/files/56457599475.pdf
    • https://5a.ro/ckfinder/userfiles/files/21802496122.pdf
    • http://dgxzz.com/uploadfile/file/82457248999.pdf
    • http://slesnick.net/userfiles/files/xison.pdf
    • http://nanchang.chinatupai.com/web/js/ckfinder/userfiles/files/mejexolusipabikipeke.pdf
    • http://stroykap.com/application/views/stroykap/userfiles/file/gofaf.pdf
    • http://palestraarkadia.it/userfiles/files/tulededik.pdf
    • http://outspokenholland.com/userfiles/fckFile/20210906225320.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=installare+android+su+tablet+samsung
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d5da.bin
7e5b75a9025a50b645fe137178ef99785dabf1357b66ed0e4716fa99b480e4b2		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD5DA 19480 bytes
font_01_sfnt_off000108c4.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x108C4 16792 bytes
font_02_sfnt_off000120db.bin
f7781d74c3e680f3a317365ea98faddd83d224a1cafa971a7e7e5ea9480d4b4d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x120DB 10780 bytes

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