Malicious PDF — malware analysis report

Static analysis result for SHA-256 1a28e673cbfc2c61…

MALICIOUS

PDF

82.7 KB Created: 2021-09-18 19:44:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: cc5ba443b175feba2aec454c3e9a20f1 SHA-1: 39fccbfe6dbcea1051bc5dc32afd3c891035067e SHA-256: 1a28e673cbfc2c61a36593274f233afc8af0b39129b42995b2c211aeaa26e4e2
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The PDF contains numerous embedded URLs pointing to various domains, suggesting a link farm or redirection mechanism. The presence of PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports the idea that the document is part of a scheme to manipulate search engine results or host malicious content across multiple domains.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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 http://cudicio.it/images/file/23147450209.pdf In PDF document text
    • http://iact2001.com/userData/board/file/92398213806.pdfIn PDF document text
    • http://tabbanbros.com/admin/fckeditor/editor/filemanager/connectors/upload/file/govaze.pdfIn PDF document text
    • https://ewdel.cz/ckfinder/userfiles/files/bakasufowanepumig.pdfIn PDF document text
    • http://wagnerpc.com/userfiles/files/97117871952.pdfIn PDF document text
    • http://zonwering-belgie.nl/ckfinder/userfiles/files/lasibipaj.pdfIn PDF document text
    • http://www.scenekunstskolen-efteruddannelsen.dk/ckfinder/userfiles/files/kelozax.pdfIn PDF document text
    • http://oilmachineydy.com/d/files/82708965761.pdfIn PDF document text
    • http://www.altrus.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1613645ec498f7---17649530242.pdfIn PDF document text
    • https://groupburuemas1.com/contents/files/35402621344.pdfIn PDF document text
    • http://studiobonvino.com/userfiles/files/jewereginot.pdfIn PDF document text
    • https://euronet.stonavka.cz/webpagebuilder/ckfinder/userfiles/files/61804884484.pdfIn PDF document text
    • https://letajicikoberce.cz/userfiles/file/pituda.pdfIn PDF document text
    • https://factorysales.com/userfiles/files/rigiduzopuladadafuvux.pdfIn PDF document text
    • https://www.advids.co/wp-content/plugins/formcraft/file-upload/server/content/files/161315f1f8071e---10458453142.pdfIn PDF document text
    • http://ms-krmelin.cz/app/webroot/files/files/ganifizefoje.pdfIn PDF document text
    • https://yourwebcenter.com/files/file/nibogixorasorilelowadake.pdfIn PDF document text
    • http://marmaraisg.com/images_upload/files/52458003705.pdfIn PDF document text
    • http://hsi-international.com/ckfinder/userfiles/files/18978722.pdfIn PDF document text
    • https://cncunse.com/d/files/83985662953.pdfIn PDF document text
    • https://qigoodteam.com/uploads/files/202109022056251143.pdfIn PDF document text
    • https://togeltop.net/contents/files/zepikivazen.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=pawandeep+rajan+winnerPDF 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_off0000dad2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAD2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f2e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2E4 19868 bytes
SHA-256: a69ab85b495d184629ce96560ba96c51ed37297e0761a4a1288ec1e14fe107cd
font_02_sfnt_off00012692.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12692 10172 bytes
SHA-256: 74156bd9f20153075cdd5ccee6a7d40ae62b0184a116850b768e1a747a6ff998

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