Malicious PDF — malware analysis report

Static analysis result for SHA-256 8cda4abb3df902f9…

MALICIOUS

PDF

67.2 KB Created: 2021-10-01 01:45:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 2e547a4ff150e25a36b881f689eef3ca SHA-1: f6e635a3bee718791e948a5671ece41b9e8a3bd3 SHA-256: 8cda4abb3df902f90b4508f9be4e3ca71ebe9a23ec318172abb4e52c12250508
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file flagged by ClamAV as Pdf.Phishing.Trojan and a machine learning classifier as malicious. It contains embedded JavaScript and numerous external URIs, many of which point to PDF files hosted on potentially disposable domains, suggesting a link farm or phishing lure. The presence of embedded JavaScript indicates an attempt to execute malicious code within the PDF viewer, likely to redirect the user to malicious sites or download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 6

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://mlbcsimleague.com/ckfinder/userfiles/files/40478415501.pdf In PDF document text
    • https://olterus.net/contents/files/65446074199.pdfIn PDF document text
    • https://creativetalentnetwork.com/ckfinder/userfiles/files/63203682775.pdfIn PDF document text
    • http://cl-metalparts.com/d/files/gadojesedan.pdfIn PDF document text
    • https://gym-rectif.fr/ckfinder/userfiles/files/vigobefoluwobatojiwowoja.pdfIn PDF document text
    • http://grandinhr.eu/images/user/file/barinedisuso.pdfIn PDF document text
    • https://tckontrola.hr/files/97118570724.pdfIn PDF document text
    • https://seeandhearbetter.ie/img/shop/contents/vanolowojudeligapulesema.pdfIn PDF document text
    • http://lemma-studio.pl/userfiles/file/61037961649.pdfIn PDF document text
    • http://mariamozharova.ru/uploads/files/20919645157.pdfIn PDF document text
    • http://placidlakes.com/larpm/uploads/file/86667878931.pdfIn PDF document text
    • http://hotspot-usa.com/js/upload/files/71871637392.pdfIn PDF document text
    • http://justsayhi365.com/uploads/file/tunebefewaxonula.pdfIn PDF document text
    • https://petribax.nl/userfiles/file/goligowerosufesad.pdfIn PDF document text
    • http://keifo.ru/ckfinder/userfiles/files/60410242464.pdfIn PDF document text
    • http://koala-al.com/d/files/xegirinujepuwejerofadiw.pdfIn PDF document text
    • https://www.taxikladis.gr/wp-content/plugins/formcraft/file-upload/server/content/files/161378e6063f76---77545831219.pdfIn PDF document text
    • http://americandeliorder.com/uploads/files/24661650636.pdfIn PDF document text
    • https://yodobashi-church.com/51409025664.pdfIn PDF document text
    • http://slipa.site/0429/upload/files/70615805696.pdfIn PDF document text
    • https://cottingham-group.com/cufiles/files/57691681240.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=all+games+in+ppssppPDF 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_off0000abb5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xABB5 14796 bytes
SHA-256: fe9817bfdcc8be597cde82d1a39b014e1bf57ccbca06a16f57b1f070b14552fe
font_01_sfnt_off0000d088.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD088 10260 bytes
SHA-256: 0465f2a5245f519ba9508b89654c28db91fa82c95ad80c71afacb40e85d4ce7f
font_02_sfnt_off0000e789.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE789 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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