Malicious PDF — malware analysis report

Static analysis result for SHA-256 fffa3b397801cf0f…

MALICIOUS

PDF

67.4 KB Created: 2021-09-29 10:19:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 79600b54b91eaec9e6fbc157b8feae64 SHA-1: 5523157cafb57a396d7fcb602a13c510effe610d SHA-256: fffa3b397801cf0f139776a251d9975a0251337cc45c8d713a138c65c21e78cd
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The PDF contains numerous embedded URLs, many pointing to suspicious domains, suggesting a phishing or malware distribution attempt. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' further supports this by indicating the PDF is part of a link farm on disposable hosting.

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 http://theponghop.com/upload/files/murijowitatilobosife.pdf In PDF document text
    • https://unaizahic.com/Files/files/pagosuwalabupajoko.pdfIn PDF document text
    • http://itineraire-consulting.com/ckfinder/userfiles/files/mopifebawapewazosiv.pdfIn PDF document text
    • https://www.golaw.net/wp-content/plugins/formcraft/file-upload/server/content/files/1613edf15b49d3---41712644760.pdfIn PDF document text
    • http://cjmfgx.morefriendship.com/upload/files/lewabofakixotiso.pdfIn PDF document text
    • http://freeware-software-download.de/uploads/editor/file/javifuvuzinodaviboji.pdfIn PDF document text
    • https://www.informacion-indoorclub.com/boletines/img/file/2319629752.pdfIn PDF document text
    • http://azseal.net/uploads/userfiles/file/59154863760.pdfIn PDF document text
    • http://novo-foto.ru/ckfinder/userfiles/files/55804384332.pdfIn PDF document text
    • http://teleserviciomalaga.com/ckfinder/userfiles/files/36627266454.pdfIn PDF document text
    • https://attack.lt/images/files/19718721062.pdfIn PDF document text
    • https://signos.larrialdiak.es/files/galeria/files/buwifenij.pdfIn PDF document text
    • https://puertoestereo.com/wp-content/plugins/super-forms/uploads/php/files/hf5hkdv1hjasa69mgpfq7e82pt/jutuvagojonexero.pdfIn PDF document text
    • http://zensushidanapoint.com/uploads/files/tudapokuxivapadadaziza.pdfIn PDF document text
    • http://bagiez.de/userfiles/file/wirusijoveludipekizav.pdfIn PDF document text
    • https://implant-drill.com/userfiles/file/vikigojanafi.pdfIn PDF document text
    • https://printsolutions.printsolutions.bg/uploads/wysiwyg/files/98253892431.pdfIn PDF document text
    • https://mai-avto.ru/upload_files/file/luref.pdfIn PDF document text
    • https://tutorlookup.com/ckeditor/ckfinder/userfiles/files/sapasipatipupupesaxuw.pdfIn PDF document text
    • http://fixafilm.se/userfiles/file/munibojovanowekevupa.pdfIn PDF document text
    • http://erainbowrealty.com/userfiles/file/lopizunaruzesedizuz.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=virtualization+on+androidPDF 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_off0000ac8e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAC8E 14836 bytes
SHA-256: 106b97595b1aeeb12df921529b2ad16ef7af32765965f34997ff08f974942fb4
font_01_sfnt_off0000d22c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD22C 10068 bytes
SHA-256: f5f841f307e0ffdcbca3135c36da8605b442a1fb2b807d390ce8cc8bd173a97e
font_02_sfnt_off0000e8b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8B1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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