Malicious PDF — malware analysis report

Static analysis result for SHA-256 1c9ebe87bb5accac…

MALICIOUS

PDF

80.0 KB Created: 2021-09-14 14:08:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: ede9d67521931e1e485f3193e43256b2 SHA-1: 3eee44fb38575f2b7da0e2bd1afa6beb63d140f8 SHA-256: 1c9ebe87bb5accacc949f5666232f89f265cc89d41e999381d3eeda03077391a
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, many pointing to potentially disposable domains, suggesting a link farm or phishing lure. The PDF structure and heuristic firings indicate it's designed to redirect users to external sites, likely for further exploitation or credential harvesting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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 http://www.omt.ntou.edu.tw/ckfinder/userfiles/files/wubatudutunivogipor.pdf In PDF document text
    • http://blankheich.de/images/uploads/file/45909145439.pdfIn PDF document text
    • http://haenuri.net/ckupload/files/lotudirevigit.pdfIn PDF document text
    • http://xutricolor.com/uploadfile/files/buvijukudisodavew.pdfIn PDF document text
    • http://stardentalcare.org/userfiles/file/xugonotawag.pdfIn PDF document text
    • http://serenetour.com/image/upload/File/lefivi.pdfIn PDF document text
    • http://belgium-ex.com/images/blog/file/pomazakewuguzuruporovubo.pdfIn PDF document text
    • https://cardolf.ro/files/wetuje.pdfIn PDF document text
    • http://inoxbienhoa.com/upload/files/50939683928.pdfIn PDF document text
    • http://xn--2e0b30g3uq7pay7m.com/upload/fckeditor/file/7192224105.pdfIn PDF document text
    • http://studioiulianella.it/userfiles/files/nojevilum.pdfIn PDF document text
    • http://muaah.ca/userfiles/files/77569369130.pdfIn PDF document text
    • http://dok-vo.ru/userfiles/file/pelago.pdfIn PDF document text
    • https://hanakspotrebice.cz/eshop/ckfinder/userfiles/files/1794667200.pdfIn PDF document text
    • https://playgametoday.ru/wp-content/plugins/super-forms/uploads/php/files/e63e146169473f0320eac9ac5fd2af6c/ritob.pdfIn PDF document text
    • http://bona-agra.pl/Upload/file/nupinu.pdfIn PDF document text
    • http://kechengchem.com/upload/files/97590261186.pdfIn PDF document text
    • http://www.w.radeton.cz/ckfinder/userfiles/files/gafojurisaveg.pdfIn PDF document text
    • http://discoveryenglish.org/wp-content/plugins/formcraft/file-upload/server/content/files/1613275586aefb---kurufiresadadibotezapez.pdfIn PDF document text
    • http://sireny.net/share/files/zutuduze.pdfIn PDF document text
    • http://sziszolg.hu/editor_up/10768247667.pdfIn PDF document text
    • http://prabashproperties.com/ckfinder/userfiles/files/wufagewozufebamez.pdfIn PDF document text
    • http://allgeology.ru/ckfinder/userfiles/files/titubugula.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=my+life+and+hard+times+pdfPDF link annotation
    • http://alessandrotria.altervista.org/areap/ckfinder/userfiles/files/17871558291.pdfIn PDF document text
    • 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_off0000d5e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5E0 17068 bytes
SHA-256: d6b6303be548a422def887c176066a74ae5c0e157d8c90ad9efccd73251949f9
font_01_sfnt_off00010236.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10236 10748 bytes
SHA-256: e7a1e33e4d783ba254a3e4904945c17e93696500b11d032afc34a8148300a9c3
font_02_sfnt_off00011ab3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11AB3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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