Malicious PDF — malware analysis report

Static analysis result for SHA-256 a5ca75cbb75d84af…

MALICIOUS

PDF

83.2 KB Created: 2021-09-12 16:12:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-22
MD5: c86f68b76eaae7621ade414b7a273d7a SHA-1: 5e1b7a1e25f7c5ffc78ea560585af1f6ca78bdef SHA-256: a5ca75cbb75d84af05c73f76ce8de5ee43aaaeea296d9f05b6cfe7db1c158e90
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm and contains embedded JavaScript. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 6

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://x-leather.com/radsportfiles/file/55629774798.pdf In PDF document text
    • http://agrocare.hu/ckfinder/userfiles/files/womububapowumidu.pdfIn PDF document text
    • http://hokkaido-love87.com/app/webroot/js/ckfinder/userfiles/files/99460764930.pdfIn PDF document text
    • http://in-dapt.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136c63d1d128---30560158843.pdfIn PDF document text
    • http://goldenmallbiotech.com/upload/files/7301587815.pdfIn PDF document text
    • https://eko-briketes.lv/userfiles/files/53313162431.pdfIn PDF document text
    • http://szyoujin.com/UploadFile/file/20210909163244506.pdfIn PDF document text
    • http://aldo-ins.com/userfiles/file/benigod.pdfIn PDF document text
    • http://amphorabeautyclub.com/campannas/file/zifiz.pdfIn PDF document text
    • http://dent-pro.cz/pic/file/22952635378.pdfIn PDF document text
    • http://nawoo.net/userData/board/file/ginuzatanukexosizase.pdfIn PDF document text
    • https://bisleriuber.genefied.co/ckfinder/userfiles/files/68978185114.pdfIn PDF document text
    • http://ibrahimabuomira.com/ckeditor/ckfinder/userfiles/files/40547439590.pdfIn PDF document text
    • http://fthyhs.com/resource/docContentImg/file/2021-09-09/064c0fd39846bd9a21075101ceec9f24.pdfIn PDF document text
    • http://chanakyaaerospacedefence.com/userfiles/file/13800458283.pdfIn PDF document text
    • http://cisseo.net/userfiles/files/49994418741.pdfIn PDF document text
    • http://upoart.com/ckfinder/userfiles/files/mudajimixawag.pdfIn PDF document text
    • http://leylasuren.com/images/userfiles/imagefile/6549738779.pdfIn PDF document text
    • http://emeraldcovepartners.com/_data/images/file/zasup.pdfIn PDF document text
    • http://casaledellasignora.it/userfiles/files/19833597485.pdfIn PDF document text
    • https://snpwachq.com/files/js/ckfinder/userfiles/files/48806186744.pdfIn PDF document text
    • https://cornerstonelaw.eu/userfiles/file/24497075586.pdfIn PDF document text
    • http://sieckultury.pl/wp-content/plugins/super-forms/uploads/php/files/1716f822b5b8e5c8554a2ccdfbf6aacd/58820563524.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=things+that+begin+with+the+letter+dPDF 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_off0000ddbb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDBB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f5cd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5CD 18880 bytes
SHA-256: 28dc60b7912e3134e33741e5ac35429b4126c86f1bc444e7c58333ce30e723f1
font_02_sfnt_off00012710.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12710 10596 bytes
SHA-256: ffb602fd98d916775f25da13a71a591a6b283eedf474cbba6b1e9ef82dc3f18e

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