Malicious PDF — malware analysis report

Static analysis result for SHA-256 a6faaf8390e056c2…

MALICIOUS

PDF

81.2 KB Created: 2021-09-20 08:55:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 3f6db1cd1327c379b2df63cc3ba52368 SHA-1: 324d3940710ea154c3d5f3c2e5974d4f0e96ee02 SHA-256: a6faaf8390e056c2a19ee78bac6df5aaa2c3433d5c781cf63be50ce916e6bf46
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is identified as malicious by ClamAV and an ML classifier, and contains embedded JavaScript. It also includes numerous external URIs, with one specifically pointing to a URL that appears to be a redirector. The PDF structure and embedded JavaScript suggest an attempt to redirect the user to potentially malicious external sites, likely for phishing or further payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 6

  • 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.
  • 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://crysiq.ru/uplcv?utm_term=best+app+to+control+android+from+pc PDF link annotation
    • http://boki.hu/editor_up/nitetejewe.pdfIn PDF document text
    • http://watthaistuttgart.de/userfiles/file/48825375531.pdfIn PDF document text
    • https://www.landalastadservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134a728b9ed8---lazuvuxenelawuto.pdfIn PDF document text
    • http://architettorobertafasola.eu/userfiles/files/zubufepeja.pdfIn PDF document text
    • http://tourhong.com/FileData/ckfinder/files/20210917_009FB671EAD1B123.pdfIn PDF document text
    • https://lajovisena.com/gallery/file/24103249166.pdfIn PDF document text
    • https://ladulceseguros.ar/noticias/fckeditor/file/bunebezejipevavilor.pdfIn PDF document text
    • http://ocean-ex.com/images/blog/file/34005239074.pdfIn PDF document text
    • https://vietucmould.com/img-vietuc/files/81537118471.pdfIn PDF document text
    • https://rizecanreklam.com/images/file/mepejavube.pdfIn PDF document text
    • http://tnslib.tools/userfiles/files/29155624157.pdfIn PDF document text
    • https://nonbodepsg.com/uploads/files/93822753369.pdfIn PDF document text
    • http://arrhythmiaclinic.com/userfiles/file/20210916045700.pdfIn PDF document text
    • http://alpinist.store/sribati/editor/uploadfiles/69697414695.pdfIn PDF document text
    • https://ubitanduk.com/contents/files/diwikutofisobuzorix.pdfIn PDF document text
    • https://softwebstar.com/shop/userfiles/file/mikuledijuwak.pdfIn PDF document text
    • http://www.onegelha.com/wp-content/plugins/super-forms/uploads/php/files/944019fd28776f74099b0bef3e74af96/84048580800.pdfIn PDF document text
    • http://www.mananthavadynorbertines.org/www/js/ckfinder/userfiles/files/84544849538.pdfIn PDF document text
    • http://suncitygroup.ir/basefile/suncitygroupir/files/mokakorifapa.pdfIn PDF document text
    • https://path.mn/userfiles/files/balezuwejokowixi.pdfIn PDF document text
    • http://gsprojekt.eu/userfiles/files/xugubuzomovo.pdfIn PDF document text
    • http://itemclinicchina.com/ckupload/files/81287571645.pdfIn PDF document text
    • https://bomberosdenavarra.com/userfiles_nexo/files/rafipazutik.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_off0000d913.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD913 17380 bytes
SHA-256: e98fbd4077e4c2f49b9a57c7e39670284bca99eb55cd0ede1f5af38b73d958ad
font_01_sfnt_off000105fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105FA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011e11.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E11 10832 bytes
SHA-256: dcee3f79610c9b2599ef369646d56f9007680384f7d7a9789e042df65a99e880

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