Malicious PDF — malware analysis report

Static analysis result for SHA-256 2d4aa036cae206c9…

MALICIOUS

PDF

81.6 KB Created: 2021-09-14 22:36:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 956f19b91106972d9a8352e2a81c24db SHA-1: db6de1c55e6a5db0ff9911f91407113dff4d7399 SHA-256: 2d4aa036cae206c9a739639048dcc28527e2908c81622c9d79b006869d260600
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is a common technique for executing malicious code. The ML classifier and ClamAV detection strongly indicate malicious intent. The document body is heavily obfuscated, but the presence of numerous external URIs, many pointing to disposable domains, suggests a link farm or phishing attempt designed to redirect users to malicious content. The embedded JavaScript likely serves to exploit vulnerabilities or download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

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://bokaichenyu.com/upload/files/10734807791.pdf In PDF document text
    • http://dralituncer.com/userfiles/file/doterukiwifot.pdfIn PDF document text
    • https://anzhero-sudzhensk.verlauf-ekb.ru/admin/ckfinder/userfiles/files/gogadidomozuwototem.pdfIn PDF document text
    • http://gocoachfox.com/userfiles/file/wukiwitef.pdfIn PDF document text
    • https://indiantiffin4me.com/nbloom/fckuploads/file/86551526856.pdfIn PDF document text
    • https://adtw1.elfjane.com/ckfinder/userfiles/files/20467847627.pdfIn PDF document text
    • http://clingac.es/d/files/83078498856.pdfIn PDF document text
    • http://www.infranetltd.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613be7ac763b0---58465749747.pdfIn PDF document text
    • https://royal-art.pl/uploads/userfiles/files/4851866979.pdfIn PDF document text
    • https://damsindia.org/admin/uploads/file/lapatewamimatefew.pdfIn PDF document text
    • http://matsonconstruction.net/userfiles/file/dikimazamugaz.pdfIn PDF document text
    • http://nuklearmedizin-amro.de/userfiles/file/39978964337.pdfIn PDF document text
    • http://kielcenoca.pl/files/file/fupafebokadegudelalisa.pdfIn PDF document text
    • http://jfe.hk/userfiles/24662526423.pdfIn PDF document text
    • http://lexus-custom.com/js/upload/files/buxazuj.pdfIn PDF document text
    • http://fusheng-vietnam.vn/admin/webroot/upload/image/files/5886726594.pdfIn PDF document text
    • http://antonellascarpittadesigner.it/userfiles/files/boromax.pdfIn PDF document text
    • http://caycanh.vn/images/fck/file/26462894426.pdfIn PDF document text
    • http://imaginove.eu/data/Files/gusodiniraji.pdfIn PDF document text
    • https://cuatudongsaigon.vn/uploads/files/nibidovajexol.pdfIn PDF document text
    • http://szguilong.com/userfiles/files/85657383198.pdfIn PDF document text
    • http://rusiuojigalvoji.lt/wp-content/plugins/formcraft/file-upload/server/content/files/16140d58fc80a4---23123317811.pdfIn PDF document text
    • https://hanurichurch.org/ckfinder/userfiles/files/80359007048.pdfIn PDF document text
    • https://burstallconrad.com/editor_files/file/56248433418.pdfIn PDF document text
    • https://agmatbaa.com/upload/files/74753063637.pdfIn PDF document text
    • http://paradisoseminatrici.it/userfiles/files/meruwuro.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=kristin+lavransdatter+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_off0000daea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAEA 10428 bytes
SHA-256: 07a1c9b306eacfa31490760cf423b489cd1b48af8154aa5d2c7ea71c924f63ae
font_01_sfnt_off0000f2a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2A2 17988 bytes
SHA-256: 8f1d27937319e5da3fb3276904c4150ed4f523d800743dcec2ffb50ec11c04d4
font_02_sfnt_off000120d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x120D5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1