Malicious PDF — malware analysis report

Static analysis result for SHA-256 2776c4b956c4a08e…

MALICIOUS

PDF

75.1 KB Created: 2021-09-16 17:57:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: c029898751d697b4ee25151303539a2f SHA-1: fc4e3f3e76aabe21efc41e39025572b0d83eb1bc SHA-256: 2776c4b956c4a08e7591d6b91c445aef9d1fe00e2b5ce25b678c40d3f7be5632
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is a common technique for executing malicious code within documents. The presence of numerous external URLs, many hosted on disposable domains, suggests a phishing or malware distribution scheme. The ML classifier and ClamAV detection strongly indicate malicious intent, likely involving the delivery of a second-stage payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://smidgel.ru/uplcv?utm_term=jarvis+wallpaper+mac PDF link annotation
    • http://freetds.net/userfiles/file/torumarubepakumesetijafu.pdfIn PDF document text
    • http://paintmaster.hu/js/ckfinder/userfiles/files/zemasokap.pdfIn PDF document text
    • http://tabbanbros.com/admin/fckeditor/editor/filemanager/connectors/upload/file/19126956131.pdfIn PDF document text
    • https://www.allduniv.ac.in/ckfinder/userfiles/files/7448092408.pdfIn PDF document text
    • https://suhrsmad.dk/wp-content/plugins/formcraft/file-upload/server/content/files/161393cf95b1ec---fukam.pdfIn PDF document text
    • http://saopauloairporttransfers.com/ckfinder/userfiles/files/83203360853.pdfIn PDF document text
    • http://twozonechickenlasvegas.com/uploads/files/22623715515.pdfIn PDF document text
    • https://www.alapan.org/fckimages/file/rujikaniwijasupulifijuxu.pdfIn PDF document text
    • http://digitalpolicycouncil.org/imagenes/file/vopevebinoxovogawisefi.pdfIn PDF document text
    • http://charivne.info/images/file/suwevubavaxazisino.pdfIn PDF document text
    • https://thokhoavietnam.com/upload/files/rotufugapunemibokuf.pdfIn PDF document text
    • http://ketoanantamhcm.com/uploads/files/56342491518.pdfIn PDF document text
    • https://spa-salon.ru/ckfinder/userfiles/files/zujugaxaveg.pdfIn PDF document text
    • http://gioiacompany.net/images/upload/file/rorutibiwol.pdfIn PDF document text
    • https://lamaisonducoeur.ca/upload/editor/file/bikovopemabumivax.pdfIn PDF document text
    • http://tolltisztitas.eu/userfiles/files/pimojugexuneve.pdfIn PDF document text
    • http://assessmentinsight.com/ckfinder/userfiles/files/sokolerezozebovipag.pdfIn PDF document text
    • https://ever.dacola.com/upload/files/84783611544.pdfIn PDF document text
    • http://vitanova-cattery.com/upload/file/70777381616.pdfIn PDF document text
    • https://gangnampools.com/contents/files/23967448240.pdfIn PDF document text
    • http://teaterskolen-efteruddannelsen.dk/ckfinder/userfiles/files/lorafabevuganarasorulanow.pdfIn PDF document text
    • https://www.lamuccacompany.com/wp-content/plugins/super-forms/uploads/php/files/f939ccfa0c7edd6d80109d35c5462980/fulilutu.pdfIn PDF document text
    • http://sheilahancock.net/blogfck/file/72062079848.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_off0000c221.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC221 10356 bytes
SHA-256: c360ef2e78786df32ad5b133ddba62a372ca1508a5188aad488083408346f744
font_01_sfnt_off0000d990.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD990 17856 bytes
SHA-256: 986e34b5f5f67e1ea25e4b51d3d9d9c812fef1015301d632834efa2ee8003806
font_02_sfnt_off0001074f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1074F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1