Malicious PDF — malware analysis report

Static analysis result for SHA-256 af9bee4bc53ce670…

MALICIOUS

PDF

113.6 KB Created: 2021-09-18 02:54:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 2bc2a38b0708b7df02a6111ae93afe0c SHA-1: 3c6d7429e57d9db7717ceee4b8e3eec88bb25361 SHA-256: af9bee4bc53ce670cb3a615d55f1a3f4fdb1fb5c03e2180ab3a333b84bd5ba78
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external URLs, many of which are hosted on disposable domains and appear to be part of a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. While no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with malicious document lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

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://synerhu.ru/uplcv?utm_term=enfoque+estructuralista+de+la+administracion+pdf
    • http://thibidi.vinadesign.info/uploads/images/files/29217684916.pdf
    • http://emilymillerlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/74827178725.pdf
    • http://evpltravel.com/xv_image/file/55060250635.pdf
    • https://www.assofmt.org/ckfinder/userfiles/files/bojewulig.pdf
    • http://belean.pl/userfiles/file/puzogisanuxeva.pdf
    • http://hndgyl.com/v15/Upload/file/202191101525089.pdf
    • http://vanguardhungary.hu/userfiles/file/safawukotaxalitutubeguk.pdf
    • https://edinburghpools.com/contents/files/bapezokegitixizunes.pdf
    • http://rotarycochinharbour.org/ci/userfiles/files/91756031798.pdf
    • http://seanmore.com/userData/board/file/dupokoputu.pdf
    • http://cobe-ing.it/userfiles/files/73891254732.pdf
    • http://greenmodels.ru/uploads/files/mofusavimuwofuni.pdf
    • http://iseveranscopy.com/upload/editor/file/kesomutogulidiruxukudoxo.pdf
    • https://best-of-geldanlagen.de/userfiles/file/zatuwazazidadakuxil.pdf
    • https://gccpay.net/wp-content/plugins/super-forms/uploads/php/files/fe26312010ed5b1d74ad3307b1091064/gixirori.pdf
    • https://led7.ru/file/86577238630.pdf
    • http://www.ashtralmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614013766f7f9---nawaz.pdf
    • http://csc-0898.com/userfiles/file/20210901144851_i0vbkz.pdf
    • http://baheth24aqari.com/ckfinder/userfiles/files/kobaxumilira.pdf
    • http://elskenecologie.nl/files/7769436759.pdf
    • http://karlsbach.de/userfiles/files/17568456412.pdf
    • http://mcdanielz.eu/files/file/88216357572.pdf
    • http://ilink.pl/userfiles/file/89512186234.pdf
    • http://unionasset.net/file_upload/spaw_upload/file/20210906063248.pdf
    • http://hasomedia.com/userfiles/file/pewavezutixogid.pdf
    • http://studiosantomauro.it/userfiles/files/87742972528.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_off0001557d.bin
565e59e976299956a3af544ee9f3fcc3c02dc280011f91981c12c023feb6c0cf		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1557D 11008 bytes
font_01_sfnt_off00016ed4.bin
b5ab595005cb9ea4653a95ab7b5227155c9bde0a0cd2bcdd0f60e8d7f3b91975		 pdf-font-stream PDF embedded font (sfnt) at offset 0x16ED4 19400 bytes
font_02_sfnt_off0001a017.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1A017 16792 bytes

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