Malicious PDF — malware analysis report

Static analysis result for SHA-256 82d0b0e6c057a765…

MALICIOUS

PDF

71.3 KB Created: 2021-09-20 20:50:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: e82556c064bcaeb531dd3a07b9922389 SHA-1: ab4b8e32e0486688fad82872eafcada0485a5dc0 SHA-256: 82d0b0e6c057a7658e5c6c00bdfe570578824967167bc2a624612918834b60a6
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which are part of a link farm hosted on disposable domains, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. Although no scripts were extracted, the structure and embedded links point towards a malicious document designed to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://coretry.ru/uplcv?utm_term=injustice+2+mod+apk+unlimited+gems
    • http://thewellmanteam.com/userfiles/files/74665900537.pdf
    • http://ghibms.com/userfiles/files/40956332729.pdf
    • https://maintogelonline.info/contents/files/rowapifijevotujipora.pdf
    • https://ytdrive.com/CKEdit/upload/files/padabubikafege.pdf
    • http://leinerpakgelatine.com/survey/userfiles/files/73241565652.pdf
    • http://moriefrusca.com/userfiles/files/31693009446.pdf
    • http://nissanotogovap.vn/uploads/images/files/fukabakukadeza.pdf
    • http://bjzjygj.com/fckeditor/editor/filemanager/connectors/php/userfiles/file/rulikiwupajudilegujuxe.pdf
    • http://space-edge.com/upload/files/36348938658.pdf
    • https://oglethorpeclub.org/~oglethor/UserFiles/file/zikedanukarilekuj.pdf
    • http://ziguratex.com/helpdesk/app/webroot/img/userfiles/files/4472958970.pdf
    • https://mosoptagro.ru/wp-content/plugins/super-forms/uploads/php/files/1b7d27337a63b63805c28f48bab4b41b/41307175232.pdf
    • https://fertilizerproductionprocess.com/d/files/19625272511.pdf
    • https://khangle.vn/uploads/images/files/pabefozuvimiwevejakesi.pdf
    • https://abogadosaccidentealicante.centralcms.cloud/galeria/files/30584805802.pdf
    • http://aquitaine.annuaire-regional.com/ckfinder/userfiles/files/zanedodazerufiwo.pdf
    • http://studio-orlandini.com/userfiles/files/pisosipewolifowudogota.pdf
    • http://szakkepzosiklos.hu/upload/file/lofafi.pdf
    • https://dangeloremodeling.com/nbloom/fckuploads/file/xuxezepizazilipepitatox.pdf
    • http://bxbrdh.marketsearching.com/upload/files/29264504473.pdf
    • http://fcv-bo.org/data/fcv-bo/userfiles/file/jeboxenenozu.pdf
    • https://suprizpin.com/calisma2/files/uploads/52561959915.pdf
    • https://yp05.com/_UploadFile/Images/file/51748938131.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_off0000b2be.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB2BE 16792 bytes
font_01_sfnt_off0000cad5.bin
6bed82af13604c42b1286ba8be6a37475fca963aff5516d1919d6c101c632c6a		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCAD5 11152 bytes
font_02_sfnt_off0000e4bb.bin
5e9d9f3cf6316de50e4ad05fb98f0bee5ba575640a8c347be1f5f0d59ac69ee4		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE4BB 16908 bytes

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