Malicious PDF — malware analysis report

Static analysis result for SHA-256 8408b144c1fa1edc…

MALICIOUS

PDF

69.7 KB Created: 2021-09-11 17:43:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-04
MD5: 1b5f5fbbe3ee32f6a6898e14a3ee573d SHA-1: 78bf698fea9275bff6eb24b8cef2a5471b31d159 SHA-256: 8408b144c1fa1edc58ea1e105997dec0902fe5a49e6111d5bdaccc9c4fc34d40
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm and contains embedded JavaScript. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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 https://medvor.ru/uplcv?utm_term=fifa+21+mobile+download+offline PDF link annotation
    • http://weiddy.com/uploads/files/202109011447506275.pdfIn PDF document text
    • https://futurefacesnyc.com/uploads/file/zujimiziwumu.pdfIn PDF document text
    • https://digireg.pl/upload/13791941166.pdfIn PDF document text
    • http://www.ville-civaux.fr/admin/js/ckfinder/userfiles/files/80679575989.pdfIn PDF document text
    • http://legalinet.eu/userfiles/files/9250173803.pdfIn PDF document text
    • http://technoprofile.ru/userfiles/file/kudorugu.pdfIn PDF document text
    • http://ancheng-medical.com/uploadfile/files/nefolanogobabow.pdfIn PDF document text
    • http://slsnn.ru/content/files/63268547367.pdfIn PDF document text
    • http://fjzy18.com/image/uload/files/susotanese.pdfIn PDF document text
    • http://volkshilfe-vlbg.at/images/content/files/rudalilugikodade.pdfIn PDF document text
    • http://heyumpnd.com/userfiles/file///95864091208.pdfIn PDF document text
    • https://adiwirawanbali.com/wp-content/plugins/super-forms/uploads/php/files/fb351033432c377d18d86697c49c07c7/delajasegeka.pdfIn PDF document text
    • http://blessingsngo.in/userfiles/files/31276294389.pdfIn PDF document text
    • https://atasuorganiktarim.com/upload/ckfinder/files/mabitabijumamafora.pdfIn PDF document text
    • https://study-abroad-travel.com/ckfinder/userfiles/file/49602081876.pdfIn PDF document text
    • http://chono.mn/uploads/userfiles/files/tosositulovude.pdfIn PDF document text
    • http://globalbando.com/DATA/upload/files/202109031610127711.pdfIn PDF document text
    • https://bizdrive.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/1613a6f38d956b---97414901406.pdfIn PDF document text
    • https://armagedonspedycja.pl/files/file/titarete.pdfIn PDF document text
    • https://hiroyoung.com/data/files/wegetokizegus.pdfIn PDF document text
    • https://equinox-e.com/upload/files/judareroxevapenebabaxa.pdfIn PDF document text
    • http://sacoorhealth.pt/site/upload/file/31714781451.pdfIn PDF document text
    • https://penmypoem.com/new/admin/uploadfiles/file/roxeligibizonunakidopixik.pdfIn PDF document text
    • http://louisiana-arts.org.s150269.gridserver.com/siteuploads/editorimg/file/72580153414.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_off0000b21e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB21E 15400 bytes
SHA-256: e2efcf516bb32e242addbdb88996bf3cb0f60128bf674af754dc410806de6031
font_01_sfnt_off0000d945.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD945 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f15c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF15C 10524 bytes
SHA-256: a5651a3edc4b6a5653d80372a31044bba2bc6061e4f9572465f3502cd944f085

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