Malicious PDF — malware analysis report

Static analysis result for SHA-256 806f6b65563f022f…

MALICIOUS

PDF

80.8 KB Created: 2021-10-09 12:13:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 7aa342c21f361b641643e8ca303c5662 SHA-1: 1e95b36ab5d9ecff5a5266b0ae5b584a91f86eed SHA-256: 806f6b65563f022f7af3c83d713ebb9a797cb62232c6a07e681956e08d880c36
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which are hosted on disposable domains. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly suggests a malicious intent to redirect users to potentially harmful content. The ML classifier and ClamAV detection further support the malicious nature of this file.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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://inwebjor.ru/uplcv?utm_term=opportunity+cost+as+an+economic+tool+project+class+11+pdf PDF link annotation
    • http://oshcongregation.com/userfiles/file/59603212956.pdfIn PDF document text
    • http://kolkandkolkdesign.com/site/data/ws/files/ludiz.pdfIn PDF document text
    • https://kmedebiyatgunleri.com/ckfinder/userfiles/files/vetufitotixunomirup.pdfIn PDF document text
    • http://cansuyu.org/resimler/files/74618766811.pdfIn PDF document text
    • http://ticaproduce.com/ckfinder/userfiles/files/veboxuvo.pdfIn PDF document text
    • https://www.vigo.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16134c66cc2148---folusovesunowax.pdfIn PDF document text
    • http://chrisdepanneservices.com/Sites/cds/files/61943626915.pdfIn PDF document text
    • https://gcr.goldcrownresort.com/magazine_files/files/96882127666.pdfIn PDF document text
    • http://lignumweb.com/site/webroot/uploads/files/64168847416.pdfIn PDF document text
    • https://1000families.eu/userfiles/file/moril.pdfIn PDF document text
    • http://sourceit.ke/FCKeditor/editor/filemanager/connectors/php/connector.php?Command=FileUpload&Type=File&CurrentFolder=%2Ffile/femipegixiwujizosolenop.pdfIn PDF document text
    • https://shoppingplanet.ro/ckfinder/userfiles/files/29312657541.pdfIn PDF document text
    • http://flixgolf.com/ckeditor/ckfinder/userfiles/files/wodira.pdfIn PDF document text
    • http://gidaero.com/upload/fckeditor/file/69082655836.pdfIn PDF document text
    • http://appartementslisa.it/an3_Uploads/file/12256437264.pdfIn PDF document text
    • https://bomando.bomsolar.com/uploadfiles/files/45424198133.pdfIn PDF document text
    • http://exactblue.com/wp-content/plugins/formcraft/file-upload/server/content/files/16160ced433c8f---lifujivosapotitu.pdfIn PDF document text
    • http://sosonomo.com/ckfinder/userfiles/files/96231344558.pdfIn PDF document text
    • http://capitaloffice.pl/fotki/file/25720646330.pdfIn PDF document text
    • http://jeansresource.com/js/ckfinder/userfiles/files/25290969972.pdfIn PDF document text
    • https://onlinendttraining.net/files/90010084680.pdfIn PDF document text
    • http://utcsp.rustyramone.com/uploads/files/guvitojinukalowar.pdfIn PDF document text
    • http://namlinhchivietnam.net/userfiles/image/file/47571393414.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_off0000d3a9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD3A9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ebc0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBC0 11200 bytes
SHA-256: ec4dfb7954969794a2ecd6eb28fc1c9a928240e4eb41777be93b3a1eb8284709
font_02_sfnt_off00010600.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10600 18248 bytes
SHA-256: db6960d0ebb11a116ffe6a6abebd9dbc78e2575d4c54af255a0503d3e985169a

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