Malicious PDF — malware analysis report

Static analysis result for SHA-256 aa7684a5c928263d…

MALICIOUS

PDF

100.1 KB Created: 2021-11-02 01:52:39 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 019b4c9760aebf3707ee5061489ebef4 SHA-1: 22c8cc82ce43953ecafaae2aebc3c009c8fd3efe SHA-256: aa7684a5c928263d33cd985449432f82f0fea10eb86de8a130429b2aae39c4de
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, a common technique for delivering malicious payloads. The ML classifier and ClamAV detection strongly indicate malicious intent. The embedded JavaScript likely attempts to download and execute a second-stage payload from one of the numerous external URLs found within the document, which is characteristic of phishing or malware distribution campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

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://sjmhospital.org/files/js/ckfinder/userfiles/files/ridasekusod.pdf In PDF document text
    • https://spandoekland.nl/userfiles/file/tejovumozorosinalefovuvad.pdfIn PDF document text
    • http://romengo.com/ckfinder/userfiles/files/42841323375.pdfIn PDF document text
    • https://zoorichi.com/temp/fckeditor/file/71599484957.pdfIn PDF document text
    • https://fainitelecommunication.com/public/editorfiles/file/89641515426.pdfIn PDF document text
    • https://centrehistoriquesndbc.com/ckfinder/userfiles/files/busazeka.pdfIn PDF document text
    • http://3mfa.com/images/editor/files/59633756149.pdfIn PDF document text
    • https://giaiphapthietke.vn/media/file/files/pukiparuxerolumugelurivej.pdfIn PDF document text
    • http://cathugo-catamarans.de/res/wysiwyg/file/pukesazofizazo.pdfIn PDF document text
    • http://velkoobchod-man.eu/ckfinder/userfiles/files/lorikerilinizisuwuxip.pdfIn PDF document text
    • https://itracmediav5.com/ckfinder/userfiles/files/zilelusax.pdfIn PDF document text
    • https://hkfew.org.hk/ckfinder/userfiles/files/lapolumiputamivulomoxez.pdfIn PDF document text
    • http://www.peritaonline.es/ckfinder/userfiles/files/42001378699.pdfIn PDF document text
    • http://about-dogs.ru/upload/file/28892929251.pdfIn PDF document text
    • https://reazfarah.com/ckfinder/userfiles/files/xodepevaxewemazip.pdfIn PDF document text
    • http://aristosaigonhotel.vn/uploads/files/fasavelu.pdfIn PDF document text
    • http://cnmrobotics.com/files/files/nimebikaxez.pdfIn PDF document text
    • http://swaminarayangm.org/userfiles/file/mukujozusekinanusosuz.pdfIn PDF document text
    • https://hzautomatisering.nl/userfiles/file/14347965020.pdfIn PDF document text
    • https://ezastupitelstvo.sk/editor_uploads/system/files/tisopulumefebizes.pdfIn PDF document text
    • http://skpizzasubs.com/uploads/files/45417391222.pdfIn PDF document text
    • http://sugarfree-gelato.com/upload/file/63394266034.pdfIn PDF document text
    • https://lecourbe.dk/userfiles/file/56022737034.pdfIn PDF document text
    • https://www.espymetcalf.com/wp-content/plugins/formcraft/file-upload/server/content/files/1616db4004c988---jedis.pdfIn PDF document text
    • http://f-kcc.jp/user_data/userfiles/files/81688678003.pdfIn PDF document text
    • http://feedproxy.google.com/~r/MbOu/~3/vItLtdF7Pec/uplcv?utm_term=race+and+mass+incarcerationPDF 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_off00012154.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12154 18844 bytes
SHA-256: c7daa7b954056ad4c1dd6d6e4de2af81484a2b2779566369f6e245d8697e323d
font_01_sfnt_off0001528c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1528C 10532 bytes
SHA-256: c256ff8cf4428c763db41c7ac72184bf11f8fa0a48f4a1592f1e889c5e5034b2
font_02_sfnt_off00016a8e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16A8E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1