Malicious PDF — malware analysis report

Static analysis result for SHA-256 26b230a7d3ae79f6…

MALICIOUS

PDF

71.2 KB Created: 2021-09-09 00:25:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 1c5870c0d0aaab1df88b93eed553a85d SHA-1: 14c5387675d43aa6153395dd77ff59a8e95943dc SHA-256: 26b230a7d3ae79f6b46219bb6b5b812a8bf44a1cb7926f5dce82e480a28e6da9
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates the document contains numerous links to potentially disposable hosting sites, suggesting a phishing or malware distribution scheme. While no scripts were directly extracted, the presence of embedded URLs and the nature of the heuristics point towards an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://studio-orlandini.com/userfiles/files/bosibudoj.pdf In PDF document text
    • http://havefuntogether.com/image/upload/File/10977226575.pdfIn PDF document text
    • http://jenan.com/ckfinder/userfiles/files/finolirijuzezazujivitasul.pdfIn PDF document text
    • http://tradotel-riviera.com/file/26332883685.pdfIn PDF document text
    • https://allianztc.ro/files/file/teluluzipalozuva.pdfIn PDF document text
    • http://chrisdepanneservices.com/Sites/cds/files/sunizavufi.pdfIn PDF document text
    • http://ty-universe.com/image/files/20210901_164705.pdfIn PDF document text
    • http://gyndoktors.de/ckfinder/userfiles/files/1810014087.pdfIn PDF document text
    • http://aviatechinform.ru/sadm_files/56546737409.pdfIn PDF document text
    • http://langeline.com/ckeditor/upload/files/dulefopol.pdfIn PDF document text
    • https://hsdinstruments.nl/uploads/files/3902085900.pdfIn PDF document text
    • http://nandishoverseas.com/UserFiles/File/62054839507.pdfIn PDF document text
    • http://www.sg-callenberg.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613495084a0fe---67163833888.pdfIn PDF document text
    • https://dorfadvertising.com/ckfinder/userfiles/files/30581285813.pdfIn PDF document text
    • http://tw-tms.com/uploadpic/xw/files/95944566501.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16132f118e3341---77433031824.pdfIn PDF document text
    • http://jaluzipro.ru/public/userfiles/file/46343933727.pdfIn PDF document text
    • http://camelliafb.com/uploads/files/202109042020159905.pdfIn PDF document text
    • http://bellina.pl/userfiles/file/lodipomogulej.pdfIn PDF document text
    • http://palyavalaszto.hu/teszt/upload/file/89700408486.pdfIn PDF document text
    • https://mimpishio1bet.com/contents/files/16917704478.pdfIn PDF document text
    • http://dennehylaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/vewepajosixafovasesiloro.pdfIn PDF document text
    • http://halanmilk.com/upload/files/68572039202.pdfIn PDF document text
    • http://dsacare.com/admin/uploads/file/15627654650.pdfIn PDF document text
    • https://viceda.com/userfiles/file/35796645445.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=johnny+english+strikes+again+watch+onlinePDF 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_off0000b3da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB3DA 16664 bytes
SHA-256: e3accce11b319985daab0704a63b5c9ef508bd8c67695e4e0b292c060f6793ab
font_01_sfnt_off0000dde5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDE5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f5fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5FC 10792 bytes
SHA-256: fddae0f79a5f4fe00a0e48895453b342ea8b16c56fe6488bff7dfff230e7ea1b