Malicious PDF — malware analysis report

Static analysis result for SHA-256 16b13a4b84fe89d2…

MALICIOUS

PDF

77.2 KB Created: 2021-09-12 05:24:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 990a6b7a4aaea5f2c758ca66aed3abb7 SHA-1: 47636277019c55c05854d85a0c13e5fdb79fc447 SHA-256: 16b13a4b84fe89d2164efdd22bab4172e4cadb582932298dbb41e91528a90347
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The ML classifier and ClamAV detection strongly indicate malicious intent. The PDF contains numerous embedded URLs, many pointing to suspicious domains, and is flagged as a link farm designed for SEO manipulation. While no scripts were explicitly extracted, the PDF structure and heuristic firings suggest it's intended to redirect users to potentially harmful external sites, aligning with phishing or malware distribution tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://aloeverajuice.cz/files/file/27393586708.pdf In PDF document text
    • https://santchavarabed.in/ckfinder/userfiles/files/burunidolifabanizuvu.pdfIn PDF document text
    • https://tutorlookup.com/ckeditor/ckfinder/userfiles/files/72287152866.pdfIn PDF document text
    • https://marljivo.hr/UserFiles/files/77753251048.pdfIn PDF document text
    • https://matfreklam.com/calisma2/files/uploads/1609935229.pdfIn PDF document text
    • http://studiolegalezullo.eu/userfiles/files/pogofifusonojawibuxadiwiz.pdfIn PDF document text
    • http://zeguvietnam.com/uploads/ckfinder/files/364512617.pdfIn PDF document text
    • https://fundoohairstyles.com/hairstyler/images/file/57809925494.pdfIn PDF document text
    • http://dtyxbpzx.com/filespath/files/20210912073120.pdfIn PDF document text
    • http://kingsfci.com/userfiles/file/87649154752.pdfIn PDF document text
    • http://pk.mo/userfiles/file/62709406446.pdfIn PDF document text
    • https://am-system.eu/ckfinder/userfiles/files/sidimikizufixa.pdfIn PDF document text
    • https://doanandieuduong295doson.vn/namthuan/images/news/files/warutegobususirixopipova.pdfIn PDF document text
    • https://www.northamericatalk.com/wp-content/plugins/formcraft/file-upload/server/content/files/161354de99d0e4---novapax.pdfIn PDF document text
    • https://penmypoem.com/new/admin/uploadfiles/file/49757555304.pdfIn PDF document text
    • http://maximaviajes.com/FCKfiles/file/57834954858.pdfIn PDF document text
    • http://bielle-srl.com/userfiles/files/ranugi.pdfIn PDF document text
    • http://brodart01.com/wp-content/plugins/super-forms/uploads/php/files/a3gcakfv9u6nqrale3g2127iqu/benipir.pdfIn PDF document text
    • http://giteduguedesboires.com/userfiles/file/16780484142.pdfIn PDF document text
    • https://tutorlookup.com/ckeditor/ckfinder/userfiles/files/desofiginuwiteta.pdfIn PDF document text
    • https://coffotea.com/uploads/files/202109110150127815.pdfIn PDF document text
    • https://yingzhaoliuart.com/upload/file/labunobekuv.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=website+to+download+kdramaPDF 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_off0000ca51.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA51 10720 bytes
SHA-256: 6c703512bfd819ea58eae990df0d0fc8c005614c7619187a591bac33210e95ec
font_01_sfnt_off0000e2f9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2F9 17048 bytes
SHA-256: 32af62f57a1feeac8b451030bac5669fe73e8c7010725b5dce061426bd74593b
font_02_sfnt_off00010f2d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F2D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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