Malicious PDF — malware analysis report

Static analysis result for SHA-256 ba09a9d96c6ad2cb…

MALICIOUS

PDF

75.0 KB Created: 2021-09-25 10:44:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 2c0a3da352a19f4557822349c98d0a89 SHA-1: 32e5cbf6869a89de1a7ad22be57c5377bcca7315 SHA-256: ba09a9d96c6ad2cbcf2d1376f89c5223323ca124b6c2391e9d9300b8cfbdad8c
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a large number of external URIs, many of which point to disposable domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The embedded JavaScript is likely responsible for initiating the redirection to these external links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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 http://tomgiongvip.com/uploads/files/file/zijibegijaza.pdf In PDF document text
    • http://tincorner.vn/uploads/files/87008220779.pdfIn PDF document text
    • http://hutbephottaihaiphong24h.com/upload/files/xolunanosuxoxebag.pdfIn PDF document text
    • http://telecycling.org/files/file/vajagajigakodi.pdfIn PDF document text
    • http://93564497.com/userfiles/2007211595.pdfIn PDF document text
    • http://jvcc.cn/ckfinder/userfiles/files/210914043256735188fbu33.pdfIn PDF document text
    • http://garagehayashi.com/js/upload/files/pokerozebomakefaguginifun.pdfIn PDF document text
    • https://kes-stv.ru/wp-content/plugins/super-forms/uploads/php/files/6df0b3a5c44ccb0664c57ed9e104c380/43544062562.pdfIn PDF document text
    • http://ttworld.hu/uploads/content_files/files/38396440867.pdfIn PDF document text
    • http://rocincorporated.com/domain.com/images/dynamic_pages/file/18874373033.pdfIn PDF document text
    • http://www.chiringuitomediterraneo.com/ckfinder/userfiles/files/lubitom.pdfIn PDF document text
    • http://artecgroupservices.com/imagenes/file/91652899602.pdfIn PDF document text
    • http://stroisvias.ru/userfiles/file/92333860098.pdfIn PDF document text
    • http://lauraestetica.com/userfiles/files/delavisezodetitusuweti.pdfIn PDF document text
    • https://lixtech.com.tw/ckfinder/ckfiles/files/fowemaxidixedojanok.pdfIn PDF document text
    • http://citygclub.com/ckupload/files/51549127447.pdfIn PDF document text
    • https://soosekszer.hu/upload/files/37013445034.pdfIn PDF document text
    • https://pharma-tools.pl/galeria/file/biwafiwawebiwozo.pdfIn PDF document text
    • https://loyallcanada.net/editor_files/file/xipanafoba.pdfIn PDF document text
    • https://alquimia.in/admin/fckeditor/editorfile/30567353994.pdfIn PDF document text
    • http://singer-island-condos.com/userfiles/files/gikugupeba.pdfIn PDF document text
    • http://lotusromeo.fr/app/webroot/files/userfiles/files/sowul.pdfIn PDF document text
    • https://topinsolventa.ro/userfiles/file/lisanejawar.pdfIn PDF document text
    • https://mariapolis.es/ckfinder/userfiles/files/44663813251.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=kamali+from+nadukkaveri+full+movie+in+tamilPDF 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_off0000b91d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB91D 10596 bytes
SHA-256: 64a15ab2da07dc6041115fccc7bd96ea3d3a25cf6382f00d0b8e5607b21f48e7
font_01_sfnt_off0000d142.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD142 20268 bytes
SHA-256: b591046c18c11aea70afbd46061b2457e5c3518168b13337905381492386723d
font_02_sfnt_off0001062d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1062D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1