Malicious PDF — malware analysis report

Static analysis result for SHA-256 de2742c7f3e292ab…

MALICIOUS

PDF

101.7 KB Created: 2021-09-17 07:02:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 21bb261b4c5697359a4bbd5a3d177940 SHA-1: 1cfc3f04bc8af4fb063e608637b8c99e50ede49b SHA-256: de2742c7f3e292ab54e20364daf4af4df99be42f9645571071e252cd046a4888
74 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a large number of external URIs, many of which are part of a link farm on disposable hosting. The ML classifier strongly indicated maliciousness, and the embedded JavaScript likely serves to redirect users to these external sites, potentially for further exploitation or malware delivery. The presence of embedded JavaScript suggests an attempt to execute code within the PDF viewer.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

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 https://drafthe.ru/uplcv?utm_term=games+that+android+and+iphone+can+play
    • http://pb-book.com/user_file/file/ponaruxop.pdf
    • http://fivelscope.net/fckimages/32369380059.pdf
    • http://seanbittinger.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/vabevusugewesakin.pdf
    • https://www.hkha.org/ckfinder/userfiles/files/24167159152.pdf
    • http://kutyasturak.hu/images/files/nozineforebonolid.pdf
    • https://shen-su.eu/gfx/userfiles/files/pukif.pdf
    • http://brette-animation.com/userfiles/file/masojar.pdf
    • http://studioriggio.it/userfiles/files/jituwakexafijapoxitoloj.pdf
    • http://gramercy-grand.ru/files/file/10969850960.pdf
    • https://pinpointfeedtech.com/ckfinder/userfiles/files/gumazubapuju.pdf
    • https://www.theoakshealthcare.com/my_content/js/ckfinder/userfiles/files/badaboligubo.pdf
    • https://artistprasanna.com/userfiles/file/93821601086.pdf
    • https://em.heephong.org/ethnicminorities/cmsadmin/ckfinder/files/zirixe.pdf
    • http://boothbayharborshipyard.com/userfiles/file/fubugezaxatoworibotowu.pdf
    • https://iamluno.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130b25c99a8e---34052961218.pdf
    • http://aurastaffing.es/upload/file/26117457809.pdf
    • http://machinesupplier.cn/data/product/file/2021917_52312_252.pdf
    • http://ladispensadicampagna.it/uploads/assets/file/patiwuru.pdf
    • http://studiotravenzolo.it/userfiles/files/98941445203.pdf
    • http://antansconstructions.com/ckfinder/userfiles/files/rewenadedefefumow.pdf
    • http://unitec-egypt.net/userfiles/file/57110312726.pdf
    • http://aquaclub.hu/userfiles/file/39109962789.pdf
    • https://www.naabelectric.com/userfiles/files/topized.pdf
    • http://knipia.com/userfiles/file/81483226589.pdf
    • https://livnica-metalurg.com/images/pages/file/22347550529.pdf
    • 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_off00012a87.bin
4a3c9d3333ac79fe70453e185e4a7e44a6e732ee2bf8097c2d9c03924d4cff2d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12A87 17348 bytes
font_01_sfnt_off0001577b.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1577B 16792 bytes
font_02_sfnt_off00016f92.bin
d958702b54d3c6f4ae0991a504f17fa805363b75403b15093896874a5170c82f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x16F92 10932 bytes

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