Malicious PDF — malware analysis report

Static analysis result for SHA-256 efa7311e5bd7a56a…

MALICIOUS

PDF

68.1 KB Created: 2021-09-25 09:15:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 33fc21bfa24edd82a0032064f0e44a6b SHA-1: 350b0a92404d4c5f0f258c417cf3604e57108e2a SHA-256: efa7311e5bd7a56ad47ec47ab899962f0cafa7a570a5b55110c81100efbf931f
142 Risk Score

Malware Insights

MITRE ATT&CK
T1059.007 JavaScript T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains embedded JavaScript that triggers an external URI redirection. This behavior, combined with heuristics indicating a link farm on disposable hosting and ClamAV detection as Pdf.Phishing.Trojan, strongly suggests a phishing or malware delivery attempt. The ML classifier also flagged this PDF as malicious with high confidence.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9957

Heuristics 7

  • 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.
  • JavaScript action low 1 related finding PDF_JAVASCRIPT
    PDF contains a /JavaScript action. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://huntic.ru/uplcv?utm_term=fameye+new+song+2021 PDF link annotation
    • http://svadbavmoskve.com/content/xuploadimages/file/49706826903.pdfIn PDF document text
    • http://motolargo.pl/userfiles/file/nenemudezusij.pdfIn PDF document text
    • https://relleno-acidohialuronico.com/wp-content/plugins/super-forms/uploads/php/files/1cba89088d245c2cfea38f31aa15405c/98961305557.pdfIn PDF document text
    • http://tradotel-riviera.com/file/retiru.pdfIn PDF document text
    • http://sk-massimo.com/js/upload/files/mejovetimanezumutalezaw.pdfIn PDF document text
    • https://hgindustrial.eu/userfiles/files/31716104439.pdfIn PDF document text
    • http://wellfoto.cz/pictures/files/zutenopimorori.pdfIn PDF document text
    • http://ladna.pl/user_images/file/vikopema.pdfIn PDF document text
    • https://md-bud.pl/szklo/photos/file/tujoboserebuvonid.pdfIn PDF document text
    • http://pawsandtiaras.com/ckfinder/userfiles/files/fimuvoxuvinosuzumaweli.pdfIn PDF document text
    • http://vwtint.com/userData/board/file/33403201826.pdfIn PDF document text
    • https://sadhankendra.org/erc/media/sufulusabeveroga.pdfIn PDF document text
    • http://fundacjaproartis.pl/javascript/ckfinder/userfiles/files/80301304656.pdfIn PDF document text
    • http://sun-apartments.pl/data/pages/faguba.pdfIn PDF document text
    • http://iehyun.com/editorupload/file/pezew.pdfIn PDF document text
    • https://e-ceramika.pl/userfiles/file/94864747703.pdfIn PDF document text
    • https://zhansq.cn/upload/file/82821211933.pdfIn PDF document text
    • http://gemwishrs.com/ckfinder/stones/files/64207873724.pdfIn PDF document text
    • https://nucamsa.es/userfiles/files/21282067904.pdfIn PDF document text
    • http://dlugopis.kbo.pl/ckfinder/userfiles/files/mudanivomekaramot.pdfIn PDF document text
    • http://wine-paraphernalia.com/files/winep/_repo/file/tawutokuvekulisuvewud.pdfIn PDF document text
    • https://medicabg.com/uploads/wysiwyg/files/31326092864.pdfIn PDF document text
    • https://trinityautorepairs.com/uploads/files/xejavemega.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_off0000ad53.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAD53 10584 bytes
SHA-256: c44f5b5f4b2393839ec4507b316fac3583e764371aeb5b532fff65f56c7b9a61
font_01_sfnt_off0000c5a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC5A3 14960 bytes
SHA-256: bba5833a6380dace8db3f04e6f4be199b54e96cee10c1406778cf6c45534b90f
font_02_sfnt_off0000eb5d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB5D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1