Malicious PDF — malware analysis report

Static analysis result for SHA-256 b8a7679f317820f9…

MALICIOUS

PDF

67.4 KB Created: 2021-09-25 13:26:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: c689bb7e50f46720935672dcccc4ac0f SHA-1: 6b90cf8fedec20d5added107deafc7973af70244 SHA-256: b8a7679f317820f93d7fecf3b5d5df8cbaa730e0f1e3fef809316dc0e4d22a7e
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document exhibits characteristics of a phishing lure, employing an image-only interface to conceal a clickable element that redirects to external URLs. The presence of embedded JavaScript and numerous external URIs, many of which are associated with link farms and disposable hosting, strongly suggests an attempt to trick users into visiting malicious sites. The ML classifier and ClamAV detection further corroborate its malicious nature.

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
  • Image-only document with action trigger (screenshot lure) medium PDF_IMAGE_LURE
    PDF has 1 image(s), only 0 text block(s), carries a click-outward action, and is only 67 KB — typical shape of a phishing lure where a full-page screenshot hides a clickable button that launches or submits to an attacker URL.
  • 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://atlantichomeportugal.com/wp-content/plugins/formcraft/file-upload/server/content/files/16148443faa478---pinex.pdf In PDF document text
    • http://harringtonassociateslaw.com/Test/JabzMedicalBillingService/userfiles/file/xileri.pdfIn PDF document text
    • http://aquamedia.cn/ckfinder/userfiles/files/xudinibe.pdfIn PDF document text
    • https://cpc-serbia.org/js/files/jimetap.pdfIn PDF document text
    • http://timandlor.com/userfiles/file/3978495033.pdfIn PDF document text
    • https://art-gallery.mn/uploads/files/97875805245.pdfIn PDF document text
    • https://vnnc.vn/img-hdmedia/files/18691321906.pdfIn PDF document text
    • http://peiitw.com/Upload/ckeditor/files/56338933652.pdfIn PDF document text
    • https://marblobathware.ph/app/webroot/img/files/72113329596.pdfIn PDF document text
    • http://phukiendoxe.com/media/ftp/file/20117985913.pdfIn PDF document text
    • http://asremajazi.com/uploads/files/xububuzupiwexovapejaj.pdfIn PDF document text
    • http://demkapi.com/resimler/files/dulugilovetizasufoderik.pdfIn PDF document text
    • http://otczenacts.com/media/files/93743204668.pdfIn PDF document text
    • http://www.pattyn360.com/upload/forum/files/kebawizomivajef.pdfIn PDF document text
    • https://tiemhoamo.tiemhoahaibara.com/data/dulieu/files/dufosigegerit.pdfIn PDF document text
    • https://seeyounow.net/userfiles/file/japavefabekulefenagolerop.pdfIn PDF document text
    • http://stauarchitetti.eu/userfiles/files/pirevojapamez.pdfIn PDF document text
    • http://astmasme.com/userData/board/file/kirexov.pdfIn PDF document text
    • https://www.temtechnologies.fr/ckfinder/userfiles/files/dusudoxulofixirugegid.pdfIn PDF document text
    • https://www.golddustdental.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140e51d10a77---56850158325.pdfIn PDF document text
    • http://snuhonors.com/userfiles/file/74277043943.pdfIn PDF document text
    • http://guides2alpes.fr/uploads/file/37686939076.pdfIn PDF document text
    • http://evergreendentistryva.com/app/webroot/js/ckfinder/userfiles/files/75497679771.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=sartre+la+nausea+pdfPDF 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_off0000ae6b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAE6B 10456 bytes
SHA-256: 00d5b8822a498c3e5f69f8143e142a2c874f76f56eaf98481ff072b39b2e0bb8
font_01_sfnt_off0000c640.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC640 13868 bytes
SHA-256: a2ba36239ecfc6ea664512b07fb897d19e0e0cef0c937df47e6a98823943314c
font_02_sfnt_off0000e874.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE874 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1