Malicious PDF — malware analysis report

Static analysis result for SHA-256 69990c9556b7d8c5…

MALICIOUS

PDF

70.3 KB Created: 2021-09-25 19:47:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: ad20570bb953e693ff88403ad7904183 SHA-1: de634a272cb65a8193c36c33dadbb087adad7e85 SHA-256: 69990c9556b7d8c551afcfae8b5abfbc8e88b61ae305bcd44580cd1d0e5aebb9
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier, indicating malicious intent. It contains numerous external URIs, with a significant number pointing to disposable hosting, suggesting it functions as a link farm. The presence of embedded URLs and the overall structure strongly suggest a phishing or malware distribution attempt, likely initiated via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://allytemp.ru/uplcv?utm_term=redmi+note+8+is+good+for+pubg PDF link annotation
    • http://jiuxingchaoshi.com/uploads/file/181654068852.pdfIn PDF document text
    • https://www.singaporemedicalclinic.com/ckfinder/userfiles/files/10056085282.pdfIn PDF document text
    • http://ardeche.proximeo.com/ckfinder/userfiles/files/7782295236.pdfIn PDF document text
    • http://theloanwala.com/userfiles/file/bezetos.pdfIn PDF document text
    • http://ceresasrl.it/userfiles/files/zofipene.pdfIn PDF document text
    • http://rheinmotel.com/userfiles/file/xosilolidu.pdfIn PDF document text
    • https://foodexgida.com/uploads/files/vajedugavarabojewap.pdfIn PDF document text
    • http://abwcoliseum.com/uploads/files/81615846541.pdfIn PDF document text
    • https://www.quatainvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613a467ba82f8---lilibesuwotelinixanezex.pdfIn PDF document text
    • http://iseveranscopy.com/upload/editor/file/18512671942.pdfIn PDF document text
    • http://thaifilmind.com/UserFiles/file/45393296455.pdfIn PDF document text
    • https://ddriu.hu/wp-content/plugins/super-forms/uploads/php/files/7f79bd18633bb44f5c7d19917a15e6a7/35264495507.pdfIn PDF document text
    • https://transdeliveris.lt/userfiles/file/14459409888.pdfIn PDF document text
    • http://www.thaiboat.net/image/upload/File/69024047755.pdfIn PDF document text
    • http://iscelenie.info/files/file/sikuzijutetapumefuf.pdfIn PDF document text
    • http://innobiztour.com/FileData/ckfinder/files/20210919_FDF748E5C0D345D9.pdfIn PDF document text
    • https://jnnjhansi.com/userfiles/file/zetulitutito.pdfIn PDF document text
    • https://nasco-ye.com/uploads/file/60272095507.pdfIn PDF document text
    • https://tauthuy.vn/upload/files/83104183665.pdfIn PDF document text
    • https://www.soroptimist.be/oldsite/intranet/ckeditor/ckfinder/userfiles/images/files/73585253240.pdfIn PDF document text
    • http://dobryremont.pl/ebobas/portal/app/webroot/img/tmp/file/16324329720731.pdfIn PDF document text
    • http://re-media.ru/foto/ck/files/48695196460.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_off0000ade6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xADE6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c5f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC5F8 17316 bytes
SHA-256: cb3922fa862dccd529196f759546281b42c8a40ea3c72fca6ac7bf5070473ae3
font_02_sfnt_off0000f26e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF26E 11128 bytes
SHA-256: 4d3abc79b4667ca4164fa7a3a1c76f37c4ea1ccea2d0739ebcfd60c19fcaf5b0

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