Malicious PDF — malware analysis report

Static analysis result for SHA-256 facc4d5d75d410ae…

MALICIOUS

PDF

73.0 KB Created: 2021-10-01 05:50:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: afcc266fb6b9d3577026ee1dfa05ec1d SHA-1: 2135f1c886525d3e1c12b4dcd3d8f85c0a1455b4 SHA-256: facc4d5d75d410aea9cb7fe88f4ec204711a20f01f8065481334c58944e44213
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains embedded JavaScript and numerous external URIs, suggesting it's designed to redirect users to potentially harmful websites. The presence of embedded JavaScript points towards an attempt to exploit vulnerabilities or execute malicious code within the PDF viewer.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://crysiq.ru/uplcv?utm_term=move+files+to+sd PDF link annotation
    • http://evabody.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16148e106e3153---jepixazokubimofaxe.pdfIn PDF document text
    • http://shopgraeagle.com/ckeditor/uploads/files/tikodixazama.pdfIn PDF document text
    • http://chukguwang.com/files/fckeditor/file/baruwitonapotegozuwo.pdfIn PDF document text
    • https://perfumes.dropship-tracking.com/userfiles/files/guwoxidasivizuseluxuj.pdfIn PDF document text
    • https://comillaspostgrado.es/userfiles/file/24909581982.pdfIn PDF document text
    • https://www.hs-hofgastein.salzburg.at/ckfinder/userfiles/files/fadofitovubutofugifadarej.pdfIn PDF document text
    • https://mmrh.myagenda.cz/pictures/editor/files/11535829346.pdfIn PDF document text
    • http://jfhcoaching.com/userfiles/files/ronanonuvifivodoxeradosu.pdfIn PDF document text
    • https://soyana.de/js/ckfinder/userfiles/files/6992660702.pdfIn PDF document text
    • http://www.prodomasa.com/ckfinder/userfiles/files/99739195110.pdfIn PDF document text
    • http://combatkuntao.com/ckeditor/ckfinder/userfiles/files/voxikeradanovupelob.pdfIn PDF document text
    • http://www.kzhep.in.ua/wp-content/plugins/super-forms/uploads/php/files/pkrmhkprq2aqf4uigkt9k6q1t1/98173206260.pdfIn PDF document text
    • https://zniczekowalczyk.com/user_images/file/duvovazixamusijirudux.pdfIn PDF document text
    • http://randygordonlawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/nebevexakisare.pdfIn PDF document text
    • http://rubivina.com/Images_upload/files/79979999967.pdfIn PDF document text
    • https://stijsr.com/userfiles/file/nipitoxigezafola.pdfIn PDF document text
    • https://marlschuz.com/userfiles/files/45807503637.pdfIn PDF document text
    • https://marblo.marblobaths.ph/app/webroot/img/files/pudujiw.pdfIn PDF document text
    • http://marthomaiticherukole.com/userfiles/file/30901086705.pdfIn PDF document text
    • https://hijaustabilo.com/contents/files/89001224512.pdfIn PDF document text
    • http://sarkanyhajo.hu/files/file/motonazovumosuv.pdfIn PDF document text
    • http://soepcentrale-dekeyser.be/userfiles/file/91989286576.pdfIn PDF document text
    • http://isotope3.pm-ural.com/uploads/files/93436732490.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_off0000b75a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB75A 18812 bytes
SHA-256: 4d9c3ccbf5b3c030722cfe19cd20bb79a9fd04ee0178ba9025c459f0659aa2a7
font_01_sfnt_off0000e7d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7D5 10040 bytes
SHA-256: ef6c18cb40496f269c227e426b9e6861abd580cb7a1a802612e3526e9d1ab85f
font_02_sfnt_off0000fe4f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE4F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1