Malicious PDF — malware analysis report

Static analysis result for SHA-256 8f468e90f69e2f3c…

MALICIOUS

PDF

69.2 KB Created: 2021-09-24 20:27:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 3438ceb7f7d3bcedcc05f8b2b4646050 SHA-1: f604f68b462955a45b00020ebc94cdd5e3590529 SHA-256: 8f468e90f69e2f3c579119a3fc793587615c5148bdd0407e10f7acac9868b98b
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a heuristic firing for a link farm with disposable hosting, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. The embedded JavaScript likely facilitates the redirection to malicious sites, as suggested by the numerous external URIs found.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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 http://getwealthythisyear.com/ckfinder/userfiles/files/23494006115.pdf In PDF document text
    • http://sfipl.in/userfiles/file/16823988645.pdfIn PDF document text
    • https://kiemtoandongnghi.com/public/plugins/ckfinder/userfiles/files/82204713009.pdfIn PDF document text
    • https://dongytueduc.com/wp-content/plugins/super-forms/uploads/php/files/8unbflmbld26badrg5hcgjn8dc/87538796661.pdfIn PDF document text
    • http://canavesiobruno-architetti.it/userfiles/files/meledofukofasuzimago.pdfIn PDF document text
    • http://liily.jp/upload/file/20210924161849.pdfIn PDF document text
    • http://locum-system.pl/userfiles/file/77768014590.pdfIn PDF document text
    • https://fmpride.com/wp-content/plugins/super-forms/uploads/php/files/bb42ca50feebe046c3e48323b1eab5db/daselexitabeku.pdfIn PDF document text
    • https://architektor.ru/uploads/file/10202371223.pdfIn PDF document text
    • https://thuaphatlaihoanghuy.com/uploads/files/pexurop.pdfIn PDF document text
    • http://etpatatietpatata.com/userfiles/files/85272017283.pdfIn PDF document text
    • http://bjerkelunden.org/content/files/userfiles/file///69313895129.pdfIn PDF document text
    • http://ficfart.org/userfiles/file/wigonokepariwifoti.pdfIn PDF document text
    • http://club-integra.ru/userfiles/file/812803167.pdfIn PDF document text
    • http://yingtailong.com/upload/file/210916071732297115c4xp1t7i8z89.pdfIn PDF document text
    • https://ice-group.pl/userfiles/file/91707326994.pdfIn PDF document text
    • https://ddnepal.com/assets/userfiles/files/vozaxinexogafisizojisu.pdfIn PDF document text
    • http://www.wm-meyer.de/meyer/admin/editor/ckfinder/userfiles/files/96379013132.pdfIn PDF document text
    • http://aluminial.pnh.pt/js/ckfinder/userfiles/files/gosekexevojijafolumes.pdfIn PDF document text
    • https://actionsporting.com/userfiles/files/givadun.pdfIn PDF document text
    • http://asvpp.fr/pdf/mixaburunezunov.pdfIn PDF document text
    • https://behbehaniprojects.com/uploads/files/kofenotugajuriledasedor.pdfIn PDF document text
    • http://berallebags.com/UploadFiles/FCKeditor/20210905002919.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=farming+simulator+18+game+downloadPDF 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_off0000af1e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAF1E 11012 bytes
SHA-256: 3e5e5a64df26c57747d663e34e2411fc817b3d1f7b024740a13a06ec12784bba
font_01_sfnt_off0000c896.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC896 15628 bytes
SHA-256: a95c7404c7f6ff7290ecd62bfb2d02cef05b262dd55ac54595c2928cd052651d
font_02_sfnt_off0000ef85.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF85 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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