Malicious PDF — malware analysis report

Static analysis result for SHA-256 9d92959c919cc8de…

MALICIOUS

PDF

72.7 KB Created: 2021-09-11 10:45:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: b05107fe902334b2c626efc398d45a47 SHA-1: 63c11b4d6c76e1cef1e377524c81948f69776f55 SHA-256: 9d92959c919cc8de4b531791d115b4818322172106cbca5dc024ebcfdeffa178
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains embedded JavaScript and numerous external URIs, many of which point to unknown domains, suggesting an attempt to redirect the user to malicious content. The 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic indicates a pattern of creating numerous links on disposable hosting, a common tactic for phishing or distributing malware. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://raiporjai.com/piceditor/file/76263715724.pdf In PDF document text
    • http://webcertain.asia/contentupload/fckeditorUploads/organization_/file/71754561155.pdfIn PDF document text
    • https://clarkfamilybuilders.com/home/clark/public_html/ckfinder/userfiles/files/63601862771.pdfIn PDF document text
    • http://hamkr.com/userData/board/file/laxigij.pdfIn PDF document text
    • https://homestayhoian.vn/uploads/image/files/34836834177.pdfIn PDF document text
    • https://priscar.com/documents/files/94424021132.pdfIn PDF document text
    • http://expresskaliski.info/file/17714078003.pdfIn PDF document text
    • http://vasset.bg/userfiles/file/35016346659.pdfIn PDF document text
    • https://altonika.pro/files/fck/file/47875835384.pdfIn PDF document text
    • http://investin-khj.ir/ckfinder/userfiles/files/fiwuparajudidaxu.pdfIn PDF document text
    • https://congthuonghotel.vn/app/webroot/files/images/pages/files/ruzodu.pdfIn PDF document text
    • https://hoangvan.vn/wp-content/uploads/files/76377888333.pdfIn PDF document text
    • https://jeevandeepspecialcare.com/ckeditor/ckfinder/userfiles/files/soranurilexezesuk.pdfIn PDF document text
    • https://karaari.leaddeehub.com/userfiles/files/81068746520.pdfIn PDF document text
    • https://polresseluma.com/assets/ckfinder/core/connector/php/uploads/files/mubiguxodozogud.pdfIn PDF document text
    • http://studioingegneramato.com/userfiles/files/47853180152.pdfIn PDF document text
    • http://dachastyle.com/userfiles/file/44783725326.pdfIn PDF document text
    • http://yakutiaprime.ru/SITE/files/editor/file/81703829980.pdfIn PDF document text
    • https://drhuanghair.com/uploads/files/202109110150437520.pdfIn PDF document text
    • https://yukkumpulgroup2.com/contents/files/97197876917.pdfIn PDF document text
    • http://oxigensupplies.com/shipinc/userfiles/files/bikubisedudiwizet.pdfIn PDF document text
    • http://lexus-custom.com/js/upload/files/xezapas.pdfIn PDF document text
    • https://koncnc.com/genelresimler/file/21775719464.pdfIn PDF document text
    • https://dacola.com/upload/files/gizexidolameri.pdfIn PDF document text
    • http://palletgoanloi.com/img-dn/files/83166188711.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=how+to+make+voice+assistant+app+android+studioPDF 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_off0000b81a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB81A 10964 bytes
SHA-256: 7a775a07aaa8a2abf16e22a5edec6459cc892bff31f7ee96add840a84cec009a
font_01_sfnt_off0000d189.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD189 16692 bytes
SHA-256: 1f45901734e343d96e7e644c12dc2ea36162090565875c21482065496ac3f5e3
font_02_sfnt_off0000fd1d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD1D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1