Malicious PDF — malware analysis report

Static analysis result for SHA-256 13689d9fb2c5d1db…

MALICIOUS

PDF

68.0 KB Created: 2021-09-25 09:43:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: d1286c42c47f984001981861ea8778fb SHA-1: 74998811f0868bd3bff2261c9ac5293bbd165ef6 SHA-256: 13689d9fb2c5d1db68e695e799077d091104c1d23a8bf04bf79b2b2ecc879a69
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is a PDF that contains numerous embedded URLs, many of which point to potentially disposable domains. The 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic indicates a pattern of link farming on disposable hosting, suggesting a malicious intent to obscure the true destination or distribute varied payloads. The ML classifier and ClamAV detection strongly indicate malicious content, likely phishing or a downloader.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

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://jeevadhara.org/work/london/userfiles/file/82678909725.pdf In PDF document text
    • http://formel1vermietung.de/userfiles/file/57001549519.pdfIn PDF document text
    • http://ingore.cn/upload/files/dudalipokomipubag.pdfIn PDF document text
    • https://sport-jicin.cz/dokumenty/vazemovupekepejo.pdfIn PDF document text
    • https://eventaipei.com/upload/files/23976722552.pdfIn PDF document text
    • http://hemeringen.de/ckeditor_ablage/userfiles/files/33310347448.pdfIn PDF document text
    • http://cathugo-yachts.de/res/wysiwyg/file/51477225815.pdfIn PDF document text
    • http://www.mmd.ntou.edu.tw/ckfinder/userfiles/files/fimukufamepi.pdfIn PDF document text
    • http://bestpokeya.com/uploads/files/gefipotafuzowujawaj.pdfIn PDF document text
    • http://salocchi.it/userfiles/files/99577772483.pdfIn PDF document text
    • https://22importexport.com/eimages/file/napabofaba.pdfIn PDF document text
    • https://atlaskvartir.ua/data/uploads/files/kofudipotediwave.pdfIn PDF document text
    • https://www.sexualaufklaerung-schule.ch/ck/ckfinder/userfiles/files/rurosuwesawipuvo.pdfIn PDF document text
    • https://mimpiindah88.com/contents/files/jikevazoxi.pdfIn PDF document text
    • http://gesgo.de/userfiles/file/78714686402.pdfIn PDF document text
    • http://nhactheducthammy.com/upload/files/8765376808.pdfIn PDF document text
    • http://kwik-it.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16135aed10cd0e---47333111611.pdfIn PDF document text
    • http://inbeeldt.nl/userfiles/file/52934570471.pdfIn PDF document text
    • http://encino.ilovepokebar.com/uploads/files/6359805368.pdfIn PDF document text
    • http://fishngrill.iorderfoods.com/uploads/files/fipejizojozu.pdfIn PDF document text
    • http://dush-kz.ru/uploads/fck/file/52958234236.pdfIn PDF document text
    • http://mtsp.by/userfiles/files/riforufefutiz.pdfIn PDF document text
    • https://halkapsikoloji.com/userfiles/file/romevilazo.pdfIn PDF document text
    • https://binhvi.com/upload/files/79059807521.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=how+to+draw+a+cheetahPDF 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_off0000ae27.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAE27 10136 bytes
SHA-256: efd8460ee60f90606b0315b7b3c7c060c66e10a27d859143cf60be857cb4bd04
font_01_sfnt_off0000c4ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC4EF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000dd01.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD01 15008 bytes
SHA-256: 0768135bc59900e545e7311130ffeed720119b033704ba363cf39a302e93d267

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