Malicious PDF — malware analysis report

Static analysis result for SHA-256 e3dea4253acc1053…

MALICIOUS

PDF

80.8 KB Created: 2021-09-20 14:43:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: c27d5a772a67731f605547814a766311 SHA-1: 99c61670d2a652c55e46c87db37cbf466e0b61d1 SHA-256: e3dea4253acc1053085ab32c7782bc8a49df55042bc886eba8505e635ecb4404
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains numerous embedded URLs, many of which point to potentially untrusted domains, suggesting a phishing or malware distribution scheme. While no scripts were explicitly extracted, the PDF structure and heuristic firings point towards techniques used to redirect users to external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://www.sidertest.it/wp-content/plugins/formcraft/file-upload/server/content/files/161421bd0444ee---turoved.pdf In PDF document text
    • http://tokyoracing.hu/userfiles/file/fojupawutenolixa.pdfIn PDF document text
    • https://sausalito.com/wysiwygfiles/file/bejikejeziluselavo.pdfIn PDF document text
    • http://staractivecollection.com/resimler/site/files/51078196800.pdfIn PDF document text
    • http://nj-rshb.com/v15/Upload/file/20219841227777.pdfIn PDF document text
    • http://tjchenxing.com/filespath/files/20210903035231.pdfIn PDF document text
    • http://lovesushiscv.com/uploads/files/mazezikasatovo.pdfIn PDF document text
    • https://macauroommate.com/ckfinder/userfiles/files/53668700524.pdfIn PDF document text
    • http://himalayakebab.irafbrothers.com/shipinc/userfiles/files/zuvuju.pdfIn PDF document text
    • http://quangcaosms.org/media/ftp/file/zukabax.pdfIn PDF document text
    • http://lineshare.net/upload/files/20210911060135.pdfIn PDF document text
    • https://hebatkeren88.com/contents/files/11937463635.pdfIn PDF document text
    • https://unitytradefze.com/ckfinder/userfiles/files/15792130747.pdfIn PDF document text
    • https://crossfitbeeshark.ro/app/webroot/files/userfiles/files/jevixiguxera.pdfIn PDF document text
    • http://tongkhomica.com/upload/files/nasovirilekopigexite.pdfIn PDF document text
    • https://ncfouting.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b53094cbb4---jaburewakepegupotazijex.pdfIn PDF document text
    • https://autopsrus.aerovents.com/ckfinder/userfiles/files/66467474516.pdfIn PDF document text
    • https://lnpro.in/ckfinder/userfiles/files/fojulepi.pdfIn PDF document text
    • http://moristas.com/userfiles/files/mitan.pdfIn PDF document text
    • http://hart-metale.pl/gimnazjum/userfiles/file/87790217387.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=world+cup+live+streamPDF link annotation
    • 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_off0000d875.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD875 10728 bytes
SHA-256: 6f72fdd8a6bf287fa17f724b6416c69d85da80a642dda8c7d274e88e4e488b02
font_01_sfnt_off0000f128.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF128 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001093a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1093A 17476 bytes
SHA-256: d51235bacf85b871f64a0f53a50544d91aa0675460349d67dfc7b0e73f595b06

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