Malicious PDF — malware analysis report

Static analysis result for SHA-256 c8909e2806180efc…

MALICIOUS

PDF

79.6 KB Created: 2021-09-13 05:19:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 93082a64fcce7eddfc4e56b9e6dc4e43 SHA-1: 5553c38603f3f51fff155512158d685445ae8167 SHA-256: c8909e2806180efcde623db331fc0cd8b004bb7f7ec308ca75f70a2b6a6d75fc
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains an embedded JavaScript stream and numerous external URIs, many of which are hosted on potentially disposable domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The embedded JavaScript is a common technique for executing malicious code within PDFs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://kungfuclasshongkong.com/louis/taichi/ckfinder/userfiles/files/3257319298.pdf In PDF document text
    • http://veterinariomauracotti.it/userfiles/files/wanowodafekevafo.pdfIn PDF document text
    • https://sonntag-immobilien.lu/userfiles/files/tajojavus.pdfIn PDF document text
    • http://jysfh.com/upload_fck/file/2021-9-9/20210909202548360329.pdfIn PDF document text
    • https://www.conkite.com/wp-content/plugins/super-forms/uploads/php/files/fc3a39e3144604ee01efd98d0d13f68d/834628531.pdfIn PDF document text
    • http://delfosventures.com/userfiles/files/vekerativasugagi.pdfIn PDF document text
    • http://gocoachfox.com/userfiles/file/66564207560.pdfIn PDF document text
    • https://dom4m.de/userfiles/files/33397721607.pdfIn PDF document text
    • https://kurishupally.org/userfiles/file/93605468255.pdfIn PDF document text
    • https://recrut.com/files/files/96491877018.pdfIn PDF document text
    • http://www.pirac.org/wp-content/plugins/super-forms/uploads/php/files/9c894257eeae208ec3109c52240dcb6e/60181181610.pdfIn PDF document text
    • http://boras-sjuharad.boj.se/uploads/userfiles/files/40682397148.pdfIn PDF document text
    • http://fratellibeninca.com/images/file/89586021080.pdfIn PDF document text
    • http://stjconsulting.it/userfiles/files/36040044462.pdfIn PDF document text
    • http://alwaditrading.com/userfiles/files/81917012203.pdfIn PDF document text
    • https://holocaustresearch.pl/nowy/photo/file/71632886992.pdfIn PDF document text
    • http://accessibilite-salle-eau.com/ckfinder/userfiles/files/rowotegerazudumufa.pdfIn PDF document text
    • http://boxethai38.com/upload/file/40343964904.pdfIn PDF document text
    • http://sklenicky-obchod.cz/web/admin/fckeditor/userfiles/file/nusonikufisinatebufuvini.pdfIn PDF document text
    • https://turbooto.vn/upload/files/sowuliva.pdfIn PDF document text
    • https://vicotelecom.vn/static/source/images/file/52668841324.pdfIn PDF document text
    • http://zs-g.jp/app/webroot/js/ckfinder/userfiles/files/16458365129.pdfIn PDF document text
    • http://wolfroccatiassociati.it/userfiles/files/75468617181.pdfIn PDF document text
    • http://kadh.kr/bobod/upload/file/7995065263.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=world+of+tanks+android+cheatsPDF link annotation
    • http://louisiana-arts.org.s150269.gridserver.com/siteuploads/editorimg/file/74028093820.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_off0000cd15.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD15 19504 bytes
SHA-256: c2bc5b8ae41b629056d66f6b7b544a7df482a98e03e7068f5cdd0722748f1a08
font_01_sfnt_off0001003b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1003B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011852.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11852 10656 bytes
SHA-256: 13a8c4777e728dea6de5379b00da79b6fcfff10d0cdb986a349e0a4ba2bc394a