Malicious PDF — malware analysis report

Static analysis result for SHA-256 a0c8ece3929232d0…

MALICIOUS

PDF

80.9 KB Created: 2021-09-16 04:51:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: ae78e414124f9d370fcdb3336ed8bf73 SHA-1: a9acef0ca3e48597ea44f07d8d5c2cac6c0662a7 SHA-256: a0c8ece3929232d05a52389e805922c72026a9839f9928b2d545faf5075e99c1
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to a link farm hosted on disposable domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The embedded JavaScript is the primary mechanism for executing malicious actions within the PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://africansafaris-spain.com/FCKeditor/editor/filemanager/connectors/php/connector.php?Command=FileUpload&Type=File&CurrentFolder=%2Ffile/60123614342.pdf In PDF document text
    • http://ahnil.com/userData/board/file/47195141408.pdfIn PDF document text
    • http://smalternatywa.pl/media/upload/files/ccc4729d3e936735c2e4f3413b6a959d.pdfIn PDF document text
    • http://xn----8sbnbd9chja.xn--p1ai/userfiles/file/bujeruneposexipakekiseto.pdfIn PDF document text
    • https://unicorn.mn/js/ckfinder/userfiles/files/tukelero.pdfIn PDF document text
    • http://educaholistica.com/resources/img/imagesck/files/55754165211.pdfIn PDF document text
    • http://csc020.com/userfiles/file/20210912115850_gyyery.pdfIn PDF document text
    • http://toyotaquangninh.org/data/dulieu/files/gurov.pdfIn PDF document text
    • https://www.inkfactory.pk/wp-content/plugins/formcraft/file-upload/server/content/files/1613700bb5cbce---temugenosefap.pdfIn PDF document text
    • https://bohemiamaestro.com/webpagebuilder/ckfinder/userfiles/files/60118620343.pdfIn PDF document text
    • http://irths.com/upload_files/files/xemikige.pdfIn PDF document text
    • http://cwpni.com/userData/ebizro_board/file/zajapekoralolusot.pdfIn PDF document text
    • https://cooperspick.com/files/jesiwatebono.pdfIn PDF document text
    • http://orderleesushi.com/uploads/files/16478145321.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/161427f316067a---29358366500.pdfIn PDF document text
    • https://tatvan.in/userfiles/file/7328289371.pdfIn PDF document text
    • https://simondaulte.com/ckfinder/userfiles/files/95319946696.pdfIn PDF document text
    • http://sk-uralstroy.ru/uploads/files/91106065431.pdfIn PDF document text
    • https://blagoustroystvo24.ru/ckfinder/userfiles/files/41594992775.pdfIn PDF document text
    • http://travelspace.pl/userfiles/file/bawumidokolabipisamut.pdfIn PDF document text
    • http://akgwealthplanner.com/crm/files/3805443986.pdfIn PDF document text
    • http://escuelasfutbol8.com/docs/files/68351605483.pdfIn PDF document text
    • https://rarahil.org.np/ckfinder/userfiles/files/nazapilaropunokalo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=photoshop+7.0+pdfPDF 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_off0000da49.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA49 10196 bytes
SHA-256: 0307346eb5077a077c84dfcb3539f676a6584d473e3fe7a280798a938e9498bb
font_01_sfnt_off0000f14d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF14D 17100 bytes
SHA-256: 01b4e25cdb40160b29e94d9246670c3ca9165a68bf5a52909b90f2dd98fb1728
font_02_sfnt_off00011e11.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E11 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1