Malicious PDF — malware analysis report

Static analysis result for SHA-256 c51adf77bf5a9a04…

MALICIOUS

PDF

70.3 KB Created: 2021-09-29 05:07:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 688472f25c8e3b18a338061fd4f97f8a SHA-1: c66fa0b16ef7f2ccec1b484ba4732d7a5daa135e SHA-256: c51adf77bf5a9a04bdb84d7a05fb538b8bfd2459d8dc5c7804d01dbf8d318b96
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier indicating maliciousness. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic indicates the document is part of a link farm, and numerous unknown URLs were extracted, suggesting a distribution or phishing campaign. While no scripts were directly extracted, the nature of the PDF and the associated heuristics point towards a malicious intent to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://mondoaudio.it/img/uploaded/file/zenisaratodekidapisononop.pdf
    • https://alpinismbihor.ro/app/webroot/files/userfiles/files/94193957114.pdf
    • https://growyourmoney.in/userfiles/files/67091675891.pdf
    • http://iamsong.vn/uploads/files/gosaxadevaxarowajojoku.pdf
    • http://flexinform.com/hirlevel/file/mamebilarapizuzamowi.pdf
    • http://dsacare.com/admin/uploads/file/76117712586.pdf
    • http://spielundlicht.de/content_provider/documents/files/geluduxaga.pdf
    • http://odessawa.com/userfiles/file/97678187624.pdf
    • http://rapet.hu/files/jeludowikekijitiderozi.pdf
    • http://lamgi.pl/ckfinder/userfiles/files/mifel.pdf
    • https://ducthai.vn/userfiles/file/80332347882.pdf
    • http://joyearland.com/ckfinder/userfiles/files/pexoxevapif.pdf
    • http://15441707.com/data/board/file/20210912135319.pdf
    • http://alpes-maritimes.proximeo.com/ckfinder/userfiles/files/76018664737.pdf
    • https://absoluteanytime.com/media_file/files/files/56960772676.pdf
    • http://mesotects.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613bb9aa767a8---gizetivefitinedanad.pdf
    • http://johndanton.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/61730767586.pdf
    • http://hawaiianhunareiki.it/file/55467567223.pdf
    • https://alasclub.gr/neuro/ckfinder/userfiles/files/zoxukolemoles.pdf
    • https://dunakanyarfesto.hu/ckfinder/userfiles/files/mobitetasexotijabop.pdf
    • http://box8websites.com/ckfinder/userfiles/files/muvogaxajirazakenedazan.pdf
    • https://lsp.od.ua/wp-content/plugins/super-forms/uploads/php/files/9t58qsv8ckvj3djl11sm5lvgd2/zaxovogubizikenowolewef.pdf
    • http://decaldankinh.net/upload/files/53713445478.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=talking+tom+hack+app
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000afe9.bin
3838b06e5bd515112c50ff268a929a5b6dde236d4cc74f9ede33e2ab31959de9		 pdf-font-stream PDF embedded font (sfnt) at offset 0xAFE9 17484 bytes
font_01_sfnt_off0000dc47.bin
65a9f72698daef3f02eb471769231cc52013fbba30133312c1549b055cbacadf		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDC47 10476 bytes
font_02_sfnt_off0000f3e5.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF3E5 16792 bytes

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