Malicious PDF — malware analysis report

Static analysis result for SHA-256 8ceaa08889834070…

MALICIOUS

PDF

86.8 KB Created: 2021-09-13 14:36:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 1505a6c2581b879c99bfcb473f2359b5 SHA-1: 9ae3408492844b6dcec88db3905c7fe5c38faf6e SHA-256: 8ceaa0888983407009e0e0971c2aef900588d8fae602f19c82af636773b037b4
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and is flagged as a link farm on disposable hosting, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. The embedded JavaScript likely facilitates the redirection to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://broadcasthub.com/ci/userfiles/files/3678287908.pdf In PDF document text
    • http://warwick-ems.org/userfiles/file/86973318674.pdfIn PDF document text
    • https://eksiliotomotiv.com/upload/ckfinder/files/nusatoxasesogo.pdfIn PDF document text
    • http://www.marcado.ca/wp-content/plugins/formcraft/file-upload/server/content/files/161334812253fb---75253516692.pdfIn PDF document text
    • https://livewireeventz.com/userfiles/file/66650181698.pdfIn PDF document text
    • http://4rrecycle.com/files/file/6685821838.pdfIn PDF document text
    • https://qwert5.com/psum/admin/userfiles/file/90091885823.pdfIn PDF document text
    • https://fitnessrev.net/wp-content/plugins/super-forms/uploads/php/files/c41bkhr4ga0b47feusptuct96r/26539808350.pdfIn PDF document text
    • http://cu-hinothai.com/ckfinder/userfiles/files/25272972875.pdfIn PDF document text
    • http://ylphs.com/ckfinder/userfiles/files/mewelapubojisizarod.pdfIn PDF document text
    • http://uniondrygoods.com/fckeditor/userfiles/file/walewujavutulazuzoluku.pdfIn PDF document text
    • http://coniperfumes.cl/js/ckfinder/userfiles/files/66333526029.pdfIn PDF document text
    • https://nabijdefossa.nl/upload/files/23260315391.pdfIn PDF document text
    • http://jfe.hk/userfiles/6860912246.pdfIn PDF document text
    • http://musicincw.com/fckeditor/userfiles/image/xokewajunifadekoxowod.pdfIn PDF document text
    • https://fresh-cherries.com/ckfinder/userfiles/files/rutowegasurile.pdfIn PDF document text
    • http://www.mecateengenharia.com.br/ckfinder/userfiles/files/lofusimigapu.pdfIn PDF document text
    • http://thebankcardservice.com/uploads/files/48031937041.pdfIn PDF document text
    • https://chmelo.hu/sites/default/files/file/36648348544.pdfIn PDF document text
    • https://senesi-sklad.cz/userfiles/file/joxogezamoku.pdfIn PDF document text
    • http://apisicul.com/userfiles/files/zaxiwozanimixoluv.pdfIn PDF document text
    • https://dom-titan.rs/files/gibafajifixubi.pdfIn PDF document text
    • http://amirmazandaranihospital.com/ckeditor/files/files/naxetigejunivuwasaxaze.pdfIn PDF document text
    • http://hgbs.de/userfiles/file/mopapusozuvo.pdfIn PDF document text
    • http://enovosti.info/ckfinder/userfiles/files/29339261756.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=echo+show+app+storePDF 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_off0000ede5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDE5 18428 bytes
SHA-256: 1b6013fa0894f9c3f425cac0e36ad5faabeb2fc9dc283eb6a032f4ff6b01ae34
font_01_sfnt_off00011dee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11DEE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013605.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13605 10296 bytes
SHA-256: 2896c73f6100c7eabbed68b5c47f1abebb5a1d3e2cae8ace0fe5c5bd617fc59a