Malicious PDF — malware analysis report

Static analysis result for SHA-256 6addacbee9312a9d…

MALICIOUS

PDF

81.8 KB Created: 2021-09-11 19:31:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: fb44faa9aed3e8e026db10c1f4fb1ff9 SHA-1: 41975c543b3aa385218e0b2362a139ae42d88108 SHA-256: 6addacbee9312a9d145da7f7eb60dee2ae6d99b2ba18c4a5d635d565038e8bb6
74 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 within documents. This script likely redirects the user to one of the numerous external URLs found in the sample, potentially leading to a phishing page or the download of further malware. The ML classifier strongly indicated maliciousness, supporting this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

Heuristics 5

  • 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://archism.ru/uplcv?utm_term=watch+the+house+arrest+of+us PDF link annotation
    • http://chrislahoda.ca/userfiles/file/lovabofazi.pdfIn PDF document text
    • https://szaniterplaza.hu/ckfinder/userfiles/files/sizijukibomutaw.pdfIn PDF document text
    • https://unique-u.biz/images/uploads/file/21068174598.pdfIn PDF document text
    • http://alpes-maritimes.proximeo.com/ckfinder/userfiles/files/44257816006.pdfIn PDF document text
    • http://secureyun.cn/uploadfile/file///2021091000360848.pdfIn PDF document text
    • http://sro52.ru/uploads/files/dawodunabefenujulevefogi.pdfIn PDF document text
    • http://www.kocay.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16138c21b823e1---vowadugasek.pdfIn PDF document text
    • https://www.santaterezinha.com.br/js/ckfinder/userfiles/files/11416492231.pdfIn PDF document text
    • http://xn--oy2b9bv81anouola.com/upload/file/202109011908464817.pdfIn PDF document text
    • https://orrizon.ru/images/file/jeraluges.pdfIn PDF document text
    • http://nationalcoopadvisors.com/userfiles/files/jazowataxutodetaxeneja.pdfIn PDF document text
    • http://creative-format.com/upload/editor/files/267402659.pdfIn PDF document text
    • https://nuregio.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613b70008862b---89163079288.pdfIn PDF document text
    • http://avandcie-automation.fr/ckfinder/userfiles/files/jizesateveviwupometum.pdfIn PDF document text
    • http://townofwinslowin.com/flash/townofwinslowin.com/file/xudevumabesavosobifigope.pdfIn PDF document text
    • http://wsm.hk/images/files/vamoxupewegajumufudar.pdfIn PDF document text
    • http://bjqyms.com/filespath/files/20210906231108.pdfIn PDF document text
    • http://hanabi-la.com/uploads/files/wadomis.pdfIn PDF document text
    • http://podolsk-kondicionery.ru/upload_picture/file/xufasuzeg.pdfIn PDF document text
    • http://parkety-patemal.sk/files/file/wapadozumovu.pdfIn PDF document text
    • http://currycornersugarland.com/admin/images/file/xorawogofowudobilo.pdfIn PDF document text
    • http://brixtontaxi.com/survey/userfiles/files/43999028965.pdfIn PDF document text
    • http://vanharteyoga.nl/uploads/files/zubadibovonipukuk.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_off0000dada.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDADA 18236 bytes
SHA-256: 37c6bec5c0cf3cd86d69946bcb8ed03f72d7462512c477070aaa9984db75e58e
font_01_sfnt_off00010a74.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A74 10284 bytes
SHA-256: 3720867863a6050f37119e3515a335306c4d3f04ab3cb08912c8e50941335314
font_02_sfnt_off000121d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x121D7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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