Malicious PDF — malware analysis report

Static analysis result for SHA-256 66ce06f5c8425e81…

MALICIOUS

PDF

82.3 KB Created: 2021-09-09 15:25:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 515ee018fbf0cb25eee0002438014370 SHA-1: 86ad64ab45d94ddc86d56a2927be4673a769081c SHA-256: 66ce06f5c8425e81980efa3434bebb7ba21734374cb443df78f162a62fc1fb7b
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a high number of external URIs, many of which are hosted on disposable domains, indicating a link farm or phishing attempt. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to redirect users to malicious sites or download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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 http://olivetheater.com/userData/board/file/70766882131.pdf In PDF document text
    • http://yung-shun.com/userfiles/file/62886229891.pdfIn PDF document text
    • https://tomas-music.com/contents/files/62286012971.pdfIn PDF document text
    • https://concurs-euclid.ro/upload/fck/99263108724.pdfIn PDF document text
    • https://ksboutlet.com/file/files/sakegefazugojoxa.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137670ade09a---21640689406.pdfIn PDF document text
    • http://fpole.ru/sadm_files/pavunezalufesuj.pdfIn PDF document text
    • http://kramor.bg/userfiles/file/xirujimu.pdfIn PDF document text
    • http://ristoranteibucanieri.it/userfiles/files/zofozijewevuz.pdfIn PDF document text
    • https://jamisonfurnace.ca/userfiles/files/73963636592.pdfIn PDF document text
    • http://ozhelalikram.de/resimler/files/78975247667.pdfIn PDF document text
    • http://abworder.com/uploads/files/91053078007.pdfIn PDF document text
    • https://nasco-ye.com/uploads/file/37880280451.pdfIn PDF document text
    • https://hotararicedo.ro/files/files/39854265720.pdfIn PDF document text
    • https://majorsagilekvaros.hu/uploads/file/88384538873.pdfIn PDF document text
    • https://www.fyna.com.au/application/third_party/ckfinder/userfiles/files/77116714531.pdfIn PDF document text
    • http://billedbutikken.dk/articlefiles/file/89534982661.pdfIn PDF document text
    • https://moraure.net/js/ckfinder/userfiles/files/99232687828.pdfIn PDF document text
    • http://business-plan-capalpha.eu/mbp/upload/images/images/upload/ckfinder/netokesesinuresis.pdfIn PDF document text
    • http://parkergeneralcontractors.net/userfiles/file/bebilabeza.pdfIn PDF document text
    • http://totoumi.jp/upload/file/30810635713.pdfIn PDF document text
    • http://artpolinakuzina.ru/pict/file/litix.pdfIn PDF document text
    • http://adbrf.com/files/fckeditor/file/10678313646132fa5b97ae6.pdfIn PDF document text
    • http://lor-rostov.su/userfiles/files/fuvodawakon.pdfIn PDF document text
    • http://v-lukomorie.com/uploader/files/zitikabesewosukaruzesele.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=pokemon+drastic+downloadPDF 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_off0000dc7d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC7D 10708 bytes
SHA-256: 036cbcc07c43cc2ba8f71f5c136d6b66fa6221320528d32c583a0df8dc77b6c9
font_01_sfnt_off0000f522.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF522 17996 bytes
SHA-256: f4285e15d856a036e1f3c0d2b91c694d8b722267e75f9ec57c30edfe75326817
font_02_sfnt_off000123ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x123CE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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