Malicious PDF — malware analysis report

Static analysis result for SHA-256 b28816fd38018f18…

MALICIOUS

PDF

76.7 KB Created: 2021-09-28 06:50:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-20
MD5: f6fa0b10a3c64f7a9caee45883f6e820 SHA-1: 0be04b2cb3225888b87d93510df6658285c299ce SHA-256: b28816fd38018f186157bbdf3c68339c1443ce6b8a9e7dfe4eb6c72f209e1b83
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs pointing to a link farm hosted on disposable domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further payloads. The presence of embedded JavaScript suggests it is used to facilitate the redirection or obfuscate the malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://infrive.ru/uplcv?utm_term=nfc+taginfo+app PDF link annotation
    • http://peaceinsrilanka.lk/ckfinder/userfiles/files/66738757251.pdfIn PDF document text
    • http://agisma.ru/files/pages/files/27605809334.pdfIn PDF document text
    • https://hoangvan.vn/wp-content/uploads/files/tirimusawideb.pdfIn PDF document text
    • http://designbyjoseph.com/uploads/File/dilikitovodegafo.pdfIn PDF document text
    • http://www.arborvitae.cz/ckfinder/userfiles/files/310292491.pdfIn PDF document text
    • http://healingtown.org/userData/board/file/56862995903.pdfIn PDF document text
    • http://china-engine.net/ckfinder/userfiles/files/tebuta.pdfIn PDF document text
    • http://www.morrisjones.co.uk/EditorImages/file/mujimefebemiwibiriv.pdfIn PDF document text
    • http://buydecor.ru/uploads/files/28719049176.pdfIn PDF document text
    • http://www.artefuoricentro.it/js/lib/ckfinder/userfiles/files/dejunexapetal.pdfIn PDF document text
    • http://thietbibepnhahang.net/media/files/18602979455.pdfIn PDF document text
    • http://bpsstudio.hu/uploads/momagakujibef.pdfIn PDF document text
    • http://husplaza.hu/editor_up/63424806832.pdfIn PDF document text
    • http://anquocrealty.com/uploads/image/files/vitegerarisipad.pdfIn PDF document text
    • http://flashdisplay.net/UploadFiles/FCKeditor/20210909043316.pdfIn PDF document text
    • https://alident.centralcms.cloud/galeria/files/9596117650.pdfIn PDF document text
    • http://chengzechem.com/upload/files/41340211291.pdfIn PDF document text
    • https://smwebtechnology.com/arishayurveda.com/userfiles/file/14059959129.pdfIn PDF document text
    • https://bodzlomu.com/userfiles/file/palexixixo.pdfIn PDF document text
    • https://karpzbeldowa.pl/uploads/userfiles/files/sulobepetewabebodoburus.pdfIn PDF document text
    • http://szkolaprywatnaleszno.pl/userfiles/file/xukeraxosoda.pdfIn PDF document text
    • http://reiki-roots.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1612f64510c0a3---28284038699.pdfIn PDF document text
    • http://bakefruit.com/uploads/files/202109231905295930.pdfIn PDF document text
    • https://www.peeryhotel.com/wp-content/plugins/super-forms/uploads/php/files/5493155ea8c900ea50f802fa61a08b26/taletoxusodagokasevo.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_off0000c2b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC2B6 10188 bytes
SHA-256: 2d6cbfd690e1afdd881a0ff0d4065d3a3710a144ae21387a66cadfa4fc8192c2
font_01_sfnt_off0000d9ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9AB 19060 bytes
SHA-256: 340c35431cefe57e645d7d6d9a694309ef4a14f514312dbcaf37bfc1170977ad
font_02_sfnt_off00010b9a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B9A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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