Malicious PDF — malware analysis report

Static analysis result for SHA-256 e08af3ceb471e89f…

MALICIOUS

PDF

73.0 KB Created: 2021-09-12 03:01:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 60624b5dc47a28cb67b8ccf4f459fade SHA-1: 450f4c6f11e3a81ca59ee6079f0b4cf12fae9aa2 SHA-256: e08af3ceb471e89f18f24d379d5ddc247e4c6f85b25c6cc0011fd0f2ccd32198
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. It contains numerous embedded URLs, many of which point to potentially malicious PDF files hosted on disposable domains, suggesting a link farm or redirection scheme. The presence of PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports this, indicating a tactic to obscure the true destination.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://kanizsakran.hu/userfiles/file/85494110085.pdf In PDF document text
    • http://kelvista.lt/images/files/bosituvemeradimeweluf.pdfIn PDF document text
    • https://szaniterplaza.hu/ckfinder/userfiles/files/benidefilezarexu.pdfIn PDF document text
    • http://vntattoosupply.net/uploads/image/files/48272232900.pdfIn PDF document text
    • http://okvin.org/userfiles/file/54164039154.pdfIn PDF document text
    • https://www.autopsrus.com/ckfinder/userfiles/files/lasiset.pdfIn PDF document text
    • http://windowsplusllc.com/ckfinder/userfiles/files/86124935971.pdfIn PDF document text
    • https://cyc-catering.pe/disac/userfiles/file/vafovinuvowowalutifim.pdfIn PDF document text
    • https://alkhairi.co.uk/wp-content/plugins/super-forms/uploads/php/files/9f09e0adfdbbc8a573f0ec8cb7b188c7/10132934044.pdfIn PDF document text
    • http://www.ccengis.be/applications/ckeditor/addons/ckeditor/ckfinder/userfiles/files/rojukaden.pdfIn PDF document text
    • http://americasbestwingspa.iorderfoods.com/uploads/files/91633605668.pdfIn PDF document text
    • http://nrgmedia.hu/files/file/1431324329.pdfIn PDF document text
    • http://sherwoodonionfestival.com/ckfinder/userfiles/files/tabuvupetapejaxu.pdfIn PDF document text
    • http://huichem.com/ckfinder/userfiles/files/100437021.pdfIn PDF document text
    • http://www.marcado.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1613897ec270cb---fomapijolexopavetixenon.pdfIn PDF document text
    • http://dinhviht.com/images/newtech/files/sizulatapunoxaliviz.pdfIn PDF document text
    • https://arnetbilgisayar.com/upload/ckfinder/files/vubijadesazedufefafarid.pdfIn PDF document text
    • http://telecycling.org/files/file/revuxinopixopa.pdfIn PDF document text
    • https://highrise.pl/file/vosoxorasuvajakadej.pdfIn PDF document text
    • http://wowbond.com/upload/Fckeditor/file/63205471602.pdfIn PDF document text
    • http://www.heksan.com.pl/file/mililesobeputavuwavez.pdfIn PDF document text
    • http://akwarella.pl/user_uploads/file/zekupekavefifuvo.pdfIn PDF document text
    • http://eko-inwest.eu/upload/file/zilejinapomarirugapav.pdfIn PDF document text
    • http://itkaufmann.com/images/fckimages/file/29838081687.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=pode+atualizar+o+android+do+celularPDF 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_off0000b97b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB97B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d18d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD18D 17764 bytes
SHA-256: 29fed20063c70833ce7acb015843cff6a06068276b13dd12e1504af075bb1435
font_02_sfnt_off0000fda6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDA6 10356 bytes
SHA-256: 902558d66312f40ff626f5cde9670dc086c62a108a741bc8e53b90aa3a147f5e

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