Malicious PDF — malware analysis report

Static analysis result for SHA-256 4dfbfcb437e0a524…

MALICIOUS

PDF

82.2 KB Created: 2021-09-09 01:53:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-23
MD5: 76b4d356fb2253aa21b923657755e66f SHA-1: 6ab21e7a040376c80327b35f1fc6bf8847240923 SHA-256: 4dfbfcb437e0a524a76cc6ff4e6c83e57790a5001bbf1c7cadd0d07ea4b51c5c
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://solamsys.com/userData/board/file/99629978459.pdf In PDF document text
    • https://stauber.lt/images/files/7448578406.pdfIn PDF document text
    • https://pmrmhss.com/userfiles/file/33266870860.pdfIn PDF document text
    • http://sipsak.nl/userfiles/file/givojov.pdfIn PDF document text
    • http://studiosiciliani.eu/userfiles/files/48780290890.pdfIn PDF document text
    • http://huonglonghotel.com/uploads/image/files/92780179878.pdfIn PDF document text
    • http://wdnederland.nl/file/61826886999.pdfIn PDF document text
    • http://orzo.cz/uploaded/files/72173045703.pdfIn PDF document text
    • http://vectorma.ru/uploads/assets/file/tizexalawiduz.pdfIn PDF document text
    • http://hiro-seiko.com/upload/files/19184598034.pdfIn PDF document text
    • https://cyklo-wellness-penzion-palice.cz/content/16782642985.pdfIn PDF document text
    • http://samuiluxurytravel.com/Uploads/file/wobekalezejigeposasin.pdfIn PDF document text
    • https://rhythmcprandfirstaid.com/wp-content/plugins/super-forms/uploads/php/files/f72b3274bf937f7a783921a6ccf7eef9/wabutezuzi.pdfIn PDF document text
    • http://garmaclima.com/uploads/ckfinder/files/baraxejivudatav.pdfIn PDF document text
    • http://gartenstadt-apotheke.com/userfiles/file/81029512896.pdfIn PDF document text
    • http://royalrep.com/userfiles/files/ligelajoxakivarew.pdfIn PDF document text
    • http://auto-spec.ca/fck/file/83165356800.pdfIn PDF document text
    • http://myphamasia.net/upload/files/86669829175.pdfIn PDF document text
    • http://chronocertif.com/userfiles/file/52211980819.pdfIn PDF document text
    • https://consultemergingmarkets.cubsindia.com/files/wotopabotakumekulodugawu.pdfIn PDF document text
    • http://agedwedfjtj.pretty-match.com/upload/files/54911560638.pdfIn PDF document text
    • http://www.acefence.com/wp-content/plugins/formcraft/file-upload/server/content/files/161340ae5b5193---42310350733.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=android+tv+box+mxq+pro+4k+manualPDF 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_off0000dbee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBEE 18060 bytes
SHA-256: babec367636bd990453dfacd7cdb93a8431074ff265ea6025b3db3cd8441cebd
font_01_sfnt_off00010a56.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A56 10960 bytes
SHA-256: 7752624100334a7a140ba2333a2882f2cc75f9534c3fb95fd9fe72bfd8131dfb
font_02_sfnt_off00012348.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12348 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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