Malicious PDF — malware analysis report

Static analysis result for SHA-256 350ae7370d6654ef…

MALICIOUS

PDF

82.4 KB Created: 2021-09-11 20:55:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: f88668e70432755d57bb2fdd4ff0d96b SHA-1: de7ad2ed7cc6ad1bfdb52e2b353589325aa2fa3c SHA-256: 350ae7370d6654efc5a4ed1b0cf133a247cbf7c66b5a44f07c18df0bfcb62769
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, a common technique for exploiting PDF vulnerabilities or redirecting users. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a large number of external links, suggesting a phishing or content-scraping lure. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution via the numerous external URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9911

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://livres-arts.com/ckfinder/userfiles/files/sutimeka.pdf In PDF document text
    • http://www.luminicaambiental.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c9d1b44306---11026117259.pdfIn PDF document text
    • http://swiss-ex.com/images/blog/file/10466980286.pdfIn PDF document text
    • https://ekransamara.ru/files/35217006856.pdfIn PDF document text
    • http://lonniestireandauto.com/nbloom/fckuploads/file/subenomufukabusa.pdfIn PDF document text
    • http://partnercable.hu/files/goguvade.pdfIn PDF document text
    • https://penmypoem.com/new/admin/uploadfiles/file/32963302349.pdfIn PDF document text
    • https://enerjimakine.com/tsrm1/img/userfiles/file/97255371056.pdfIn PDF document text
    • http://krzeptowski.pl/file/32078451467.pdfIn PDF document text
    • https://pu-sk.com/app/templates/js/ckfinder/userfiles/files/79270734707.pdfIn PDF document text
    • http://hakasasi.id/userfiles/file/17925982980.pdfIn PDF document text
    • https://wangwangcamp.com/uploads/files/202109011559008740.pdfIn PDF document text
    • http://bharatdarshan.net/rgroup/ckfinder/userfiles/files/vilikizaxeku.pdfIn PDF document text
    • http://cuacongtudongbinhduong.com/upload/files/59968250379.pdfIn PDF document text
    • http://ibtaker.ps/userfiles/file/65052644871.pdfIn PDF document text
    • http://cualuoiskydoor.com/webroot/img/files/20544402132.pdfIn PDF document text
    • https://cuichi177.com/uploads/files/202109110859352303.pdfIn PDF document text
    • http://barudan.hk/UploadFile/file/20210902205212041.pdfIn PDF document text
    • http://teewer.mn/ckfinder/userfiles/files/givubozar.pdfIn PDF document text
    • https://www.loscam.com/lib_common/ckeditor/ckfinder/userfiles/files/kusedowanazujukuke.pdfIn PDF document text
    • http://www.impactit.in/ckfinder/userfiles/files/94499182554.pdfIn PDF document text
    • http://kehlux.lu/userfiles/files/kesokubekapojupapinipu.pdfIn PDF document text
    • http://concilianavarra.com/userfiles/files/gadakazematixixokarezebaj.pdfIn PDF document text
    • http://efrex.cz/files/file/46143913599.pdfIn PDF document text
    • http://writtenmail.com/upload_images/file/bexabezuj.pdfIn PDF document text
    • https://glamweddingdesign.com/userfiles/file/35952159575.pdfIn PDF document text
    • http://www.britocunhaadvocacia.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/1612fcabcd91cb---18538136371.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=spiderman+ultimate+mod+apkPDF 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_off0000d9d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9D3 18944 bytes
SHA-256: 71dda70861eb0a53fcc21420ac37bb7a5b68a4c208cdb4d2e2d2f7d6a5c03431
font_01_sfnt_off00010b38.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B38 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001234f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1234F 10652 bytes
SHA-256: 7082d2c4c0938ee95330e58955b110ae4fd09d92359b49db6d3c8796a577dfb0