Malicious PDF — malware analysis report

Static analysis result for SHA-256 c1725e5e97180ba4…

MALICIOUS

PDF

77.1 KB Created: 2021-09-24 07:27:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: ee4d052b9db06abc944de4b2c93359f5 SHA-1: 74bb1d8e6cfda9b212c8c4f8737b8b79279aba4c SHA-256: c1725e5e97180ba4c00baf17a3c97c3411b125a4a6e9a1cba2de10f488715348
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by multiple heuristics, including ClamAV and an ML classifier, indicating malicious content. It contains numerous embedded URLs pointing to various domains, suggesting a link farm designed to redirect users to potentially harmful sites. The presence of PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports the interpretation of this file as a malicious link farm.

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 https://cructi.ru/uplcv?utm_term=liberty+city+in+gta+san+andreas PDF link annotation
    • https://sportnazona.bg/f/uploads/files/21944551631.pdfIn PDF document text
    • https://gmt-tw.com/app/webroot/userfiles/files/rizipulirezazukiwudej.pdfIn PDF document text
    • https://hunglivet.com/uploads/files/202109052049433232.pdfIn PDF document text
    • http://stoewebdesign.no/userfiles/file/pikuvivawuvodopozosetere.pdfIn PDF document text
    • http://kamerton.nl/clientfiles/96174210772.pdfIn PDF document text
    • http://eamenfaraz.com/cache/fck_files/file/zigukorunizosisawanakine.pdfIn PDF document text
    • http://www.giuseppe.ru/ckfinder/userfiles/files/manelolinu.pdfIn PDF document text
    • http://creationart.hu/files/file/64288601567.pdfIn PDF document text
    • http://stardentalcare.org/userfiles/file/36699708831.pdfIn PDF document text
    • https://spencershaulageltd.co.uk/wp-content/plugins/super-forms/uploads/php/files/b410c6cbbf2597c16af9abe5a04d0549/gesamoxetogudenuwarufoma.pdfIn PDF document text
    • http://immobilieninvestors.net/userfiles/file/66520510994.pdfIn PDF document text
    • https://pmfegypt.com/userfiles/files/10922718467.pdfIn PDF document text
    • http://crm333.com/documentos/file/kaxugonetemes.pdfIn PDF document text
    • http://telefoonindex.nl/images/uploads/86590529013.pdfIn PDF document text
    • http://group-anons.ru/userfiles/files/9635202781.pdfIn PDF document text
    • https://eyetracking.pl/userfiles/file/mefolimolozoser.pdfIn PDF document text
    • http://magicfood-cn.com/files/20210923192018.pdfIn PDF document text
    • http://sushistoryus.com/uploads/files/43888799437.pdfIn PDF document text
    • https://kcss.hu/korosi/userfiles/file/pezemorife.pdfIn PDF document text
    • http://way-of-spirit.ru/upload/file/31184485192.pdfIn PDF document text
    • http://eqletstalk.com/uploads/files/202109240737142971.pdfIn PDF document text
    • http://tl-maskinfabrik.dk/userfiles/file/76362459123.pdfIn PDF document text
    • http://hotel-ambassador-nice.com/upload/files/70731188736.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_off0000cb41.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB41 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e353.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE353 16856 bytes
SHA-256: b8db4cbf651544b9220e5a246f3e0fa67e1f1a126ca513132d67cba331d2bd61
font_02_sfnt_off00010edb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10EDB 10588 bytes
SHA-256: 4e93a2cd618716b3473591d69b5cd8db7928ce8a621c619779a788bf694519a2

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