Malicious PDF — malware analysis report

Static analysis result for SHA-256 6b92630e6964ef57…

MALICIOUS

PDF

82.7 KB Created: 2021-09-14 01:03:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: df6b6d59389afaf492afe03fdf8f100d SHA-1: b840d53884f943f5320477775e6ca6a67f8b1f4e SHA-256: 6b92630e6964ef574d41c0a10b733d8255e40ca44a8f4e1fb7f983d5377e60b1
74 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, indicating an attempt to redirect the user to malicious websites. The ML classifier strongly flagged this PDF as malicious, and the presence of many disposable links on potentially disposable hosting supports this assessment. The embedded JavaScript likely facilitates the redirection or further malicious actions.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

Heuristics 5

  • 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://garglob.ru/uplcv?utm_term=climb+hill+2+mod+apk PDF link annotation
    • https://eventpro-kontraktorpameran.com/uploaded/files/43665970910.pdfIn PDF document text
    • https://www.temsilcisitesi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132e55a4fc06---75083094201.pdfIn PDF document text
    • http://chrislahoda.ca/userfiles/file/jajenazifaruj.pdfIn PDF document text
    • http://ztkammer.at/uploads/file/65757060684.pdfIn PDF document text
    • http://trunglam.vn/uploads/userfiles/file/gobilurovodixunopivolaji.pdfIn PDF document text
    • https://506hlapeta.com/files/file/73236542013.pdfIn PDF document text
    • https://www.playitdirect.ca/ckfinder/uploadfiles/files/gojenipajepakugub.pdfIn PDF document text
    • http://lammermoor.net/imagenes/file/69500980069.pdfIn PDF document text
    • http://ccshecea.org/upload/files/4645813543.pdfIn PDF document text
    • https://mimpiindah88.com/contents/files/peken.pdfIn PDF document text
    • http://xingyeknitting.com/userfiles/files/pixivakefowowupuvejugox.pdfIn PDF document text
    • https://delta-relay.be/userfiles/file/2297689259.pdfIn PDF document text
    • http://fsf-vastroad.com/userfiles/file/midosubikobugisowumag.pdfIn PDF document text
    • http://www.yoko-ono.be/images/userfiles/file/61283310868.pdfIn PDF document text
    • https://autoroman-service.ro/imagini_ws/91173395273.pdfIn PDF document text
    • http://agierresrl.it/userfiles/files/1719179175.pdfIn PDF document text
    • http://hainfelderteich.at/saseguzo.pdfIn PDF document text
    • http://parbatsamajjapan.com/img/files/files/godunobazonejubatoxotenel.pdfIn PDF document text
    • http://stsmcc.org/www/js/ckfinder/userfiles/files/vifosozorogaxakokaju.pdfIn PDF document text
    • http://resortcrimea.com/ckfinder/userfiles/files/pusetojidinas.pdfIn PDF document text
    • http://hantechwelding.com/userfiles/file/2021091105501573499.pdfIn PDF document text
    • https://xosobacninh.vn/webroot/img/files/45293222336.pdfIn PDF document text
    • https://olgunbey.com/upload/ckfinder/files/rukujabanurofe.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_off0000d419.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD419 10440 bytes
SHA-256: 9a2cf627a8f5c5e70f792dcc40c4d33ea8b8b4f7ae613a2e60ef1e20a4dd4fc5
font_01_sfnt_off0000eb82.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB82 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010394.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10394 22716 bytes
SHA-256: c413d7a8d12ec3053dd697e67a5e6fb6f0c6de834b38c83c575bfbec3afff9bf

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