Malicious PDF — malware analysis report

Static analysis result for SHA-256 a465d3bcc9c22cb6…

MALICIOUS

PDF

73.4 KB Created: 2021-09-11 22:52:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: de0cf9f932e62f4fcb352c435ad42255 SHA-1: 59df84b27586faae0216e700de1ec0ea4b0c51ed SHA-256: a465d3bcc9c22cb609e8c14e45a16cb775f85570f4aac57d96f8fcb66e4c31b0
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The file is identified as a malicious PDF by multiple heuristics and a machine learning classifier. It contains numerous external URIs and is flagged as a link farm on disposable hosting, suggesting a phishing or malware distribution attempt. The presence of embedded URLs and the nature of the heuristics indicate that the PDF likely attempts to redirect users to malicious websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://pistant.ru/uplcv?utm_term=apk+similar+to+mobdro PDF link annotation
    • http://zjgyuanhong.com/v15/Upload/file/2021911113488678.pdfIn PDF document text
    • http://ngocphuocjsc.com/public/default/ckeditor/files/dazugazipelulov.pdfIn PDF document text
    • http://sourceit.ke/FCKeditor/editor/filemanager/connectors/php/connector.php?Command=FileUpload&Type=File&CurrentFolder=%2Ffile/33800530666.pdfIn PDF document text
    • http://elijasprojekts.lv/files/file/67185999400.pdfIn PDF document text
    • http://splogservice.ru/content/files/jojaf.pdfIn PDF document text
    • https://ruxthai-guesthouse-chiangmai.com/ckfinder/userfiles/files/ponemopejepafipobopu.pdfIn PDF document text
    • http://grabnerestriche.at/35935247377.pdfIn PDF document text
    • https://clarkfamilybuilders.com/home/clark/public_html/ckfinder/userfiles/files/96605426967.pdfIn PDF document text
    • http://chickendaylacrescenta.com/uploads/files/93935738657.pdfIn PDF document text
    • http://www.nationaalgolfcongres.nl/wp-content/plugins/formcraft/file-upload/server/content/files/161331289b8677---26125359176.pdfIn PDF document text
    • http://ntvietnga.com/upload/files/37153633414.pdfIn PDF document text
    • http://nj-rshb.com/v15/Upload/file/202196955362478.pdfIn PDF document text
    • https://www.hermanosvalerorecio.com/ckfinder/userfiles/files/jibaweridij.pdfIn PDF document text
    • http://moscowfashion.net/content/xuploadimages/file/25314754560.pdfIn PDF document text
    • https://larrialdiak.es/files/galeria/files/55112271166.pdfIn PDF document text
    • http://scoutpate.com/userfiles/file/93942840703.pdfIn PDF document text
    • https://baxsporthorses.nl/userfiles/file/13721096929.pdfIn PDF document text
    • http://kiapelhrimov.cz/UserFiles/File/4474897226.pdfIn PDF document text
    • http://agro-pasz.pl/ckfinder/userfiles/files/18694041121.pdfIn PDF document text
    • http://ed-union05.ru/files/file/39836344032.pdfIn PDF document text
    • https://etadelloro.it/images/file/bibun.pdfIn PDF document text
    • http://www.trisad.kz/ckfinder/userfiles/files/xoreruw.pdfIn PDF document text
    • https://copab.tn/216mag.svn/uploads/files/44590692378.pdfIn PDF document text
    • http://www.ezmoving.com/file/dewaken.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000bd02.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBD02 10528 bytes
SHA-256: 31049b1fce423ce17c70e8835645230aed899d4dc0fd462c55f0b4ccc8c9558e
font_01_sfnt_off0000d4c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4C9 16632 bytes
SHA-256: a236232402a7dc5232842eb5fdd0f442d9cd3eabd506b888cbd5c239e8ba6d78
font_02_sfnt_off0000ffd6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFD6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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