Malicious PDF — malware analysis report

Static analysis result for SHA-256 fef1e8586d9b8298…

MALICIOUS

PDF

71.6 KB Created: 2021-09-24 16:31:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 952ed89211aaf55c3a9a54b710c629fa SHA-1: d81d06aa805c8d379bb599baeef7dd225e1819f7 SHA-256: fef1e8586d9b82988524895ea7fe80c8808e8fe1c124857eb05894a6e734ac89
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a large number of external URIs, many of which are hosted on disposable domains. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or distributing further malware. The embedded JavaScript is likely used to facilitate the redirection to these malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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 https://cructi.ru/uplcv?utm_term=change+device+administrator+android
    • http://xn--h1aaebajlcgx.xn--p1ai/sadm_files/detexedunefesotal.pdf
    • https://abzesolar.com/uploads/files/segexekumi.pdf
    • https://sudhirsachdevaclasses.com/ci/userfiles/files/jobazemiv.pdf
    • https://barcelonacentremedic.cat/files/galeria/files/67310916412.pdf
    • http://pfmconsulting.org/survey/userfiles/files/titaxab.pdf
    • http://savemaxint.com/files/file/84436448714.pdf
    • http://commandhousecreations.com/uploads/files/95181060370.pdf
    • http://nuyewrecruitment.com/wp-content/plugins/super-forms/uploads/php/files/76b776ff6a92fd1c45e3eb3eef3dc816/75169352722.pdf
    • https://0800-707-808.com/upload/ckfinder_temp/files/20210909035008.pdf
    • http://koryosushi.com/uploads/files/89938479985.pdf
    • https://yourdentist.ro/app/webroot/files/userfiles/files/19099939326.pdf
    • http://to-kajihan.net/js/upload/files/tumeginijerozafotatova.pdf
    • http://ghefoot.com/fckeditor_userfiles/file/62172492458.pdf
    • https://vicotelecom.vn/static/source/images/file/34981880212.pdf
    • http://epmresearch.org/userfiles/files/jabiximedawapi.pdf
    • http://daoltrading.com/userData/board/file/poxumem.pdf
    • http://uteambio.com/upload/files/rimigumodimoledakogulu.pdf
    • http://tsrmvolontari.it/userfiles/files/1472951114.pdf
    • http://pietrek.com/MARCUS/files/file/8724160070.pdf
    • http://eptesteplelek.com/uploads/file/wawezerefikemafi.pdf
    • https://marblobathware.com/app/webroot/img/files/kupejuxudukomiloresota.pdf
    • https://www.sacproblemleri.com/wp-content/plugins/formcraft/file-upload/server/content/files/161496dd6e2405---12629807189.pdf
    • https://denimder.org/resimler/files/vofamuzu.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b3e2.bin
22c04e7362da674e8d6c1543035519299b7679c9de9ce8d967a8e88bb7c0dde8		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB3E2 16980 bytes
font_01_sfnt_off0000df52.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDF52 16792 bytes
font_02_sfnt_off0000f769.bin
2fccddbe6e76a3ed8fc6e9ebd2d747507fac41cdc9f652414b46fa3ea8f19317		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF769 10868 bytes

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