Malicious PDF — malware analysis report

Static analysis result for SHA-256 8729a660c42c4b0e…

MALICIOUS

PDF

80.9 KB Created: 2021-09-20 05:08:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: bf4864e326dea74cfcf0b2dcfe870862 SHA-1: 5860cd8e6d5b75913d7011383ffe937cca0e8b0e SHA-256: 8729a660c42c4b0eeb30b9b5f92a6a7c93fb51d99ea551a4057bafa631148a7f
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by multiple heuristics, including a high-confidence ML classifier and ClamAV detection as 'Pdf.Phishing.Trojan'. The presence of numerous embedded URLs, many pointing to disposable domains, strongly suggests a phishing or malware distribution attempt. The document body is heavily obfuscated, preventing a clear understanding of its specific lure, but the overall structure and URL patterns indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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 https://ketchas.ru/uplcv?utm_term=haircuts+that+make+face+look+thinner PDF link annotation
    • http://refinerlink.com/userfiles/file/digazeburagaraxip.pdfIn PDF document text
    • http://artpolinakuzina.ru/pict/file/35655354575.pdfIn PDF document text
    • https://vanrun-it.nl/userfiles/files/solexobonip.pdfIn PDF document text
    • http://ecole-belair.com/ecole/file/68804531947.pdfIn PDF document text
    • http://affectif.ro/data/Image/file/38391680816.pdfIn PDF document text
    • https://stotex.rs/files/wuxenewegejomid.pdfIn PDF document text
    • http://intimatehotelpattaya.com/image/upload/File/84879314892.pdfIn PDF document text
    • http://handsonmontessoripk.com/userfiles/files/gosanevarerosa.pdfIn PDF document text
    • https://nothingbutsafetyglasses.com/userfiles/file/neniti.pdfIn PDF document text
    • http://henca.com/files/details/file/gadofamutajurorovenadoped.pdfIn PDF document text
    • http://unibox.lv/files/text/63666994332.pdfIn PDF document text
    • https://umartravel.com/files/45713743361.pdfIn PDF document text
    • https://www.dooleysnaturalgas.com/ckfinder/userfiles/files/vojotetuvopuxifotuneseto.pdfIn PDF document text
    • http://www.rolstoellift.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614451c4a3625---55229902484.pdfIn PDF document text
    • http://banner-ever.com/ckImg/files/58775759233.pdfIn PDF document text
    • https://best-of-geldanlagen.de/userfiles/file/23975703835.pdfIn PDF document text
    • https://krantiservice.com/ckfinder/userfiles/files/ganitomoxexoredevugazes.pdfIn PDF document text
    • http://pferdefreunde-brueckenhof.de/sites/default/files/userfiles/file/puginabovij.pdfIn PDF document text
    • http://lagunaapartman.hu/images/user/file/62936479962.pdfIn PDF document text
    • http://www.ondebiz.com/userfiles/file/23612543279.pdfIn PDF document text
    • http://neoclassicalmansions.com/uplds/file/12483036055.pdfIn PDF document text
    • http://techmechengineers.com/uploads/vosuwalubatotonujodajafa.pdfIn PDF document text
    • https://wasael.com/userfiles/file/difunivumaxejeb.pdfIn PDF document text
    • http://jayeonrak.com/upfile_editor/2021/files/55128327782.pdfIn PDF document text
    • https://carthink.org/wp-content/plugins/formcraft/file-upload/server/content/files/1613f847ecee36---lokomaselogopesamaguzu.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_off0000d984.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD984 10784 bytes
SHA-256: 8faa687de53db6b6d473d178ee37ddaf1fcfaa0a7f568160cdcc027fa4581290
font_01_sfnt_off0000f228.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF228 16852 bytes
SHA-256: cc5ececdba836beada8fa9451fb27eea05a9bf03a5f640632301f8e440312ad9
font_02_sfnt_off00011dcd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11DCD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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