Malicious PDF — malware analysis report

Static analysis result for SHA-256 28478c521e0b0c8f…

MALICIOUS

PDF

80.0 KB Created: 2021-09-15 20:46:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 5045a4c6a50841ea952c72ad1984e9e6 SHA-1: 023aa642e37570b9620edd71e9e63ba1bc1e6ac3 SHA-256: 28478c521e0b0c8f7b0f4c7d4f5e1d2844cac5dc3b6470c25203fad89ac15fba
134 Risk Score

Malware Insights

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

The PDF contains embedded JavaScript, a common technique for executing malicious code within documents. The heuristic firings indicate this JavaScript is likely used to redirect the user to a link farm, as evidenced by the numerous external URIs and the 'PDF_SEO_DISPOSABLE_LINK_FARM' detection. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://sintjorisparochie.nl/userfiles/file/99983233648.pdf In PDF document text
    • http://abwingsmd.com/uploads/files/39899759468.pdfIn PDF document text
    • http://www.oe.com.tw/ezadmin/ckfinder/userfiles/files/36743025788.pdfIn PDF document text
    • https://clarkfamilybuilders.com/home/clark/public_html/ckfinder/userfiles/files/36300650788.pdfIn PDF document text
    • https://zniczekowalczyk.com/user_images/file/xifotejofenowosubiluz.pdfIn PDF document text
    • http://goldendazzle.com/upload/quangtri/files/kisuvawojivuzizafifivile.pdfIn PDF document text
    • http://vit-physio.de/file/zukerupafuwefevanawejim.pdfIn PDF document text
    • https://indobaliart.com/sitefiles/file/49999879856.pdfIn PDF document text
    • http://adanateknikservis.web.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1613aee045ed2d---88374500548.pdfIn PDF document text
    • http://rheinmotel.com/userfiles/file/59271509923.pdfIn PDF document text
    • https://cissud.com/uploads/ck_editor/files/livipisibuses.pdfIn PDF document text
    • http://bukharageorgia.com/sites/default/files/file/motowamupokoveliz.pdfIn PDF document text
    • http://moretonassets.net/userfiles/sasagoguronawukuvewugap.pdfIn PDF document text
    • http://www.iycadana.org/wp-content/plugins/super-forms/uploads/php/files/vfttefj28c14dhvgecei9g9m47/66364797288.pdfIn PDF document text
    • http://kurumakaitori-one.com/js/upload/files/35644894419.pdfIn PDF document text
    • https://emprenderem.cl/files/70356882873.pdfIn PDF document text
    • https://coherence.cz/userfiles/file/toradoziderijotavulomape.pdfIn PDF document text
    • http://staractivecollection.com/resimler/site/files/60464689971.pdfIn PDF document text
    • http://bjerkelunden.org/content/files/userfiles/file///20620669400.pdfIn PDF document text
    • http://3e-machinery.ru/app/webroot/filesfiles/bumirovegez.pdfIn PDF document text
    • http://85560891.com/upfolder/e/files/20210913221107.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=should+i+switch+to+apple+from+androidPDF 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_off0000d46c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD46C 17192 bytes
SHA-256: cc4cff2af658f7d12f1ebc4d31eac77aa928f68f20b6189380c29d0c3b7c2ae0
font_01_sfnt_off000100cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100CC 11148 bytes
SHA-256: ba07413c8cbce4c795f0624827e16c1071fc9f1f8a068f4b02f5af2a4e03e155
font_02_sfnt_off00011abc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11ABC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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