Malicious PDF — malware analysis report

Static analysis result for SHA-256 3e749507d6e01edc…

MALICIOUS

PDF

83.9 KB Created: 2021-09-11 04:34:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 4c3a84f218fd4a6eebb55bd98143417b SHA-1: ac200d62223c4d95d862a1372b6a71fee2e11d27 SHA-256: 3e749507d6e01edc6ce9ba296ff4a33a37f9378ae406832377fbce816acd54eb
66 Risk Score

Malware Insights

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

The PDF file was flagged by an ML classifier as malicious. Static analysis revealed it functions as a link farm, containing 30 embedded links across 24 distinct domains, many of which are disposable. The primary external URI observed is 'https://synerhu.ru/uplcv?utm_term=plex+crashing+firestick', suggesting a potential phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

Heuristics 4

  • 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 https://synerhu.ru/uplcv?utm_term=plex+crashing+firestick PDF link annotation
    • http://physocare.com/Images_upload/files/60553195684.pdfIn PDF document text
    • http://pagyesa.org/userfiles/file/20210903195952.pdfIn PDF document text
    • https://sportyou.fr/ckfinder/userfiles/files/18986994153.pdfIn PDF document text
    • http://energosol.pl/images_cms/file/xupasodakesubazepagopi.pdfIn PDF document text
    • https://100tmt.com/uploadimage/files/20210910003634.pdfIn PDF document text
    • http://letsfinal.com/userfiles/file/41635548911.pdfIn PDF document text
    • http://rhondadejean.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/xavipenutugezikesudam.pdfIn PDF document text
    • http://akgwealthplanner.com/crm/files/70042732575.pdfIn PDF document text
    • https://cylinder96.ru/admin/ckfinder/userfiles/files/lobiwotezusurewe.pdfIn PDF document text
    • http://trivio.it/userfiles/files/sitaza.pdfIn PDF document text
    • http://askaudit.ru/price/pedojikugomuvox.pdfIn PDF document text
    • http://edituj.cz/res/file/fimogarujoxukupetu.pdfIn PDF document text
    • http://thailaundry.com/imgUpload/files/jaredexelis.pdfIn PDF document text
    • http://yesilderecine.com/admin/editor_resim/file/kefaje.pdfIn PDF document text
    • http://fabrykakonwersji.pl/wp-content/plugins/super-forms/uploads/php/files/4154d78fa7085558c68db3c97c179883/75232852559.pdfIn PDF document text
    • http://shqinze.net/admin/upimg/file///pizaxopirivilefawepima.pdfIn PDF document text
    • http://abw10thstreetne.com/uploads/files/letekewem.pdfIn PDF document text
    • https://minipowerpack.net/upload/files/9323244841.pdfIn PDF document text
    • https://organicfertilizerproduction.com/d/files/36263811224.pdfIn PDF document text
    • http://kristiankutschera.de/userfiles/file/1888351427.pdfIn PDF document text
    • http://admio.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16138254f89bc8---32761621017.pdfIn PDF document text
    • http://englandmatchshirts.com/assets/file/vopidisivave.pdfIn PDF document text
    • http://lakshimi-kaatsu.com/user_data/packages/default/imgfiles/44064509072.pdfIn PDF document text
    • http://eng.sut.ac.th/tce/2016/administrator/ckfinder/userfiles/files/zepod.pdfIn PDF document text
    • 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_off0000e5d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5D7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fde9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDE9 16936 bytes
SHA-256: cafb0790d36302ac5dc39c6f902fc56a1343f1ba42e1d546825ecdc07892689f
font_02_sfnt_off000129a9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x129A9 10688 bytes
SHA-256: a78143a4cb98f228743b49fc67e93e5ab3f237436c6c636807055f5ce3060458

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