Malicious PDF — malware analysis report

Static analysis result for SHA-256 fc7de8b1d8287a13…

MALICIOUS

PDF

77.2 KB Created: 2021-09-19 06:12:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 645ff77ef4341a43c3c5f85e45601b09 SHA-1: cd721c54f4ac80f925a02673ced24191608bcd28 SHA-256: fc7de8b1d8287a1311abc3c50b0cd269b2fc56e8944abb76ee350c0fe35e028a
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by multiple heuristics, including a ClamAV detection and an ML classifier. It contains numerous external URLs, many of which are hosted on disposable domains, suggesting a link farm or phishing lure. The PDF structure and embedded URIs indicate an attempt to redirect users to potentially harmful websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9908

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://queure.ru/uplcv?utm_term=apa+7th+edition+book+citation+in+text
    • http://thuaphatlailongthanh.com/upload/contentFile/minhchau/file/murenomamivutes.pdf
    • http://azizavacanze.com/userfiles/files/kixed.pdf
    • http://parkety-patemal.sk/files/file/50813372468.pdf
    • http://ayurveda-shiatsu-qigong-nice.com/upload/files/19055248017.pdf
    • https://growyourmoney.in/userfiles/files/rekev.pdf
    • http://www.naturapreserved.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613bb6bd6d4c5---59233518691.pdf
    • http://pop-around.com/file_media/file_image/file/39246505408.pdf
    • http://www.fan-consultants.com.tw/ezadmin/ckfinder/userfiles/files/18876438696.pdf
    • https://shiprapublication.com/uniformkontakt/userfiles/image/files/jemofuzenuzakubaze.pdf
    • http://daydeothe.vn/rich_editor/file/28622281161.pdf
    • https://creativitagh.com/pevron/www/img/file/29242494442.pdf
    • http://puzynowska-kancelaria.com/userfiles/file/fedeveruwixux.pdf
    • http://ud2-140.com/files/77053064544.pdf
    • http://centronegozi.com/public/pogibepen.pdf
    • http://zoop-tech.com/ckfinder/userfiles/files/fomibubuperavuxologesuwo.pdf
    • http://mountmedpharmacy.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1614227eec95de---93787553591.pdf
    • http://abc-tel.ru/data/File/metakiridubisupuvi.pdf
    • https://almentispharma.com/ckfinder/userfiles/files/menodusezovuwow.pdf
    • http://i-p-p-c.com/ckfinder/userfiles/files/vixowasigega.pdf
    • http://host.keraladreamhomes.com/~viswabrahmathach/admin/fckeditor/editor/filemanager/connectors/php/userfiles/file/34886025780.pdf
    • https://ketex.com/trcgp/ckfinder/userfiles/files/22378409873.pdf
    • http://internet-trade.eu/UserFiles/file/pevivedapibiwabotimifaj.pdf
    • http://protok.pro/upload/files/50527687976.pdf
    • https://ferest.ro/imagini_ws/35726436266.pdf
    • http://skupka54.ru/upload/m/bifevi.pdf
    • http://dongbanja.com/userData/ebizro_board/file/6330599394.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_off0000ca4b.bin
667a18ac961e9a17f66dfa57afd858e4dab9ca6842b15426fef4338a38e7752b		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCA4B 10660 bytes
font_01_sfnt_off0000e290.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE290 16792 bytes
font_02_sfnt_off0000faa2.bin
af1fca82e5b43aec4beabc6f8ac4a19100f0066c641756821691e4b0305f68c2		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFAA2 17108 bytes

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