Malicious PDF — malware analysis report

Static analysis result for SHA-256 02ffce47dc0672b2…

MALICIOUS

PDF

74.1 KB Created: 2021-09-14 14:11:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: c99629480f03afd6519b9b3b0a2d4536 SHA-1: 053ab1b35e5dce5e8eacf4126d8bf437fcd3221b SHA-256: 02ffce47dc0672b27887a2f4f9f8aab1bb02e427f8e9ea6c59db922e65d8b936
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected by ClamAV as Pdf.Phishing.Trojan and an ML classifier assigned a high probability of maliciousness. The PDF contains a large number of embedded links pointing to various domains, many of which appear to be disposable, indicating a link farm or phishing lure. While no scripts were explicitly extracted, the PDF structure and the nature of the embedded links strongly suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://dichvumayphoto.vn/webroot/img/files/13489034071.pdf In PDF document text
    • https://pastelbuilders.com/userfiles/file/39026489785.pdfIn PDF document text
    • http://caphegiabao.com/upload/fck/file/82781607442.pdfIn PDF document text
    • http://hsaltsj.com/uploads/files/83315009952.pdfIn PDF document text
    • https://thehideawayresortpattaya.com/userfiles/files/91591110844.pdfIn PDF document text
    • http://status.cz/UserFiles/File/36301068289.pdfIn PDF document text
    • http://etalentlink.com/uploadfile/file///2021090406215032.pdfIn PDF document text
    • http://cokhihoangvinh.com/uploads/userfiles/file/48110231409.pdfIn PDF document text
    • http://wiskind.com/filespath/files/20210913213302.pdfIn PDF document text
    • https://kingbakerypans.com/userfiles/file/84144006543.pdfIn PDF document text
    • http://makinsushi.com/uploads/files/32284934828.pdfIn PDF document text
    • http://metallpress.ru/files/xopadinize.pdfIn PDF document text
    • https://luiginoiobbi.com/userfiles/file/nopewukokafif.pdfIn PDF document text
    • http://ksiclubcom.ksiclub.org/svnprojects/DHD/Source/images/files/24298625989.pdfIn PDF document text
    • http://inica.org/files/file///72837425426.pdfIn PDF document text
    • https://miamiuniquelimo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135c508866f8---tifebezired.pdfIn PDF document text
    • http://travelsi.ru/ckfinder/userfiles/files/66616452032.pdfIn PDF document text
    • https://kes-stv.ru/wp-content/plugins/super-forms/uploads/php/files/25308596c6787625bbb70280747c5c99/gawibarufurij.pdfIn PDF document text
    • http://skpizzasubs.com/uploads/files/dukarelojesezofizenu.pdfIn PDF document text
    • http://bonezi.morefriendship.com/upload/files/80409227151.pdfIn PDF document text
    • https://lanegarrett.net/userfiles/file/71864803836.pdfIn PDF document text
    • https://zzhqhi.com/d/files/98752721228.pdfIn PDF document text
    • http://cukiernia-waltar.pl/qcms/userfiles/file/tulegagezi.pdfIn PDF document text
    • http://studiofagiani.eu/userfiles/files/11503734033.pdfIn PDF document text
    • http://pharmorgsyn.com/upload/files/27880032061.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=healthy+fats+listPDF 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_off0000c259.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC259 16300 bytes
SHA-256: e1eb1a994163da7a562b70a247dc4b8773fb2a7d7ac67c5c54e06012a7172683
font_01_sfnt_off0000ec30.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC30 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010447.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10447 10092 bytes
SHA-256: 1a3acc39b4a0fa1fd8b21e37b6209fb500af249f27bd35dd563e347551b5c39a