Malicious PDF — malware analysis report

Static analysis result for SHA-256 cd514eda0d50c5b1…

MALICIOUS

PDF

83.4 KB Created: 2021-09-10 07:48:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 195417b9507435bd1b670c343ce0e9ad SHA-1: 8a96b9509bddc0aa2f7943442d93b571dae6617e SHA-256: cd514eda0d50c5b18bf10d4827cab8578af5205b9a568719a8e43e065f371192
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous embedded links, with a high heuristic firing indicating it's a link farm on disposable hosting. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. Although no scripts were explicitly extracted, the PDF structure and embedded links are indicative of a malicious document designed to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://mjacz.cz/soubory/files/xetagemosezovaw.pdf In PDF document text
    • https://hotnews.md/upload/userfiles/files/divemevokul.pdfIn PDF document text
    • http://chingyi.tw/userfiles/files/41453656747.pdfIn PDF document text
    • http://joyear.com/ckfinder/userfiles/files/50130943317.pdfIn PDF document text
    • https://mokshadhamnepal.org/userfiles/files/zujivovurilo.pdfIn PDF document text
    • https://tecnibat.net/uploads/archivos/tubixabevamazubifoto.pdfIn PDF document text
    • https://xebecdesign.com/xebec/userfiles/file/fogibawabonunapivudove.pdfIn PDF document text
    • http://systemsbiology.at/uploads/assets/file/59242575846.pdfIn PDF document text
    • https://www.intermediastudios.com.mx/wp-content/plugins/super-forms/uploads/php/files/601d473b175fab63200b64bb6279c89e/59005985229.pdfIn PDF document text
    • http://veiligheidssloten.nl/ckfinder/userfiles/files/savebasule.pdfIn PDF document text
    • http://soles2walk.cz/data/file/89373796899.pdfIn PDF document text
    • http://hoachathoanggia.com/userfiles/file/jatebaletuzavusuxuwamog.pdfIn PDF document text
    • http://mitcostruttori.it/userfiles/files/tawut.pdfIn PDF document text
    • http://3suntech.com/UploadFile/file/20210903081937651.pdfIn PDF document text
    • http://saraiaser.nl/userfiles/file/kalokobuseb.pdfIn PDF document text
    • http://ballarioarchitetti.eu/userfiles/files/54597340341.pdfIn PDF document text
    • http://www.agrosystem.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/161355f7167063---35277387591.pdfIn PDF document text
    • http://ergo-logo-bamberg.de/userfiles/file/kaxajoj.pdfIn PDF document text
    • https://eguiders.com/uploads/8649057802.pdfIn PDF document text
    • http://vektor-bezpeki.com/userfiles/files/mexetol.pdfIn PDF document text
    • https://weeb.nu/userfiles/file/retatos.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=alien+shooter+free+mod+apk+unlimited+moneyPDF 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_off0000d8b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8B5 20176 bytes
SHA-256: 1ede836eb7c1b76bd0302a25585f553f5ba63a345f474369d35f57d7f5f94657
font_01_sfnt_off00010e48.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E48 11052 bytes
SHA-256: efa3d27bbf6dd20de2516a5f2aebf857be2ae254bb3eb48035f11e2cfec47efd
font_02_sfnt_off000127dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x127DC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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