Malicious PDF — malware analysis report

Static analysis result for SHA-256 4af5d3ad2662e0a0…

MALICIOUS

PDF

80.5 KB Created: 2021-09-22 22:24:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: c48bced3d24721094316742c3b048f0b SHA-1: 770502f2e7028b976cadcf7041b767a25f3e3b25 SHA-256: 4af5d3ad2662e0a0585c3a31d8357c3ccffd40a70435969e04af341ead6201e9
134 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 potentially malicious domains hosting other PDF files. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The presence of embedded JavaScript suggests an attempt to execute malicious code within the PDF viewer.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

Heuristics 6

  • 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.
  • 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://khoahoc.timviec365.com/picturesfiles/59292101438.pdf
    • http://hyosangjo.com/userfiles/file/20210908111406.pdf
    • http://henanshuangxin.com/d/files/29620121400.pdf
    • http://www.colegiometa.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/161356e8d0b7e5---jotebatirasijovom.pdf
    • http://www.cbs-emballages.com/upload/file/tubijosetedofisuzulef.pdf
    • http://lingvastar.z-i-g-z-a-g.com/userfiles/files/79727719571.pdf
    • http://cofetariafraguta.ro/UserFiles/file/faxirimulis.pdf
    • http://kdwatch.net/upload/files/2021090215542267.pdf
    • http://oxigensupplies.com/shipinc/userfiles/files/tukadapuwo.pdf
    • http://chekeeh.ir/basefile/chekeehir/files/65215578960.pdf
    • http://wdnederland.nl/file/48889233907.pdf
    • http://wellogo.in/userfiles/file///desimatujazuwo.pdf
    • https://ptogel2.com/contents/files/resolifenojidifaten.pdf
    • https://anbc31.iscriptscloud.com/app/webroot/files/file/wixujopasulejajopimuraf.pdf
    • http://www.performhabitat.fr/bundles/astadmin/js/ckfinder/userfiles/files/sifipuwasasekupozoxuropu.pdf
    • http://mazraeir.com/images/upload/files/37033483586.pdf
    • http://biaikatolikus.hu/files/file/22657258533.pdf
    • http://longvu.vn/Images_upload/files/wivojozurid.pdf
    • http://stylekd.ru/files/29232613161.pdf
    • http://campfirewtx.org/userfiles/file/73816607247.pdf
    • https://wscnaturalhealings.com/wp-content/plugins/super-forms/uploads/php/files/c57184cd55ec8b7e0353f1c4a10584d5/bupav.pdf
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/16146dbda77bd0---71544613735.pdf
    • http://cbcom.eu/ressource/site-image/files/motiraxizolodagafotoko.pdf
    • http://kperrylaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/wujibofajajavomiwifa.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=how+to+get+free+robux+adopt+me
    • 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_off0000d7b4.bin
4d1cfbce64a0d92d229fe6bba947ed73338c41132663045e0fae2ea1ac80c7b4		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD7B4 10848 bytes
font_01_sfnt_off0000f06f.bin
cb81e102963d3bc2e7773ed7ffda17935cdf5241400ca175d007f05e4f1631d7		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF06F 17012 bytes
font_02_sfnt_off00011c97.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11C97 16792 bytes

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