Malicious PDF — malware analysis report

Static analysis result for SHA-256 8e6871eadb94cdc7…

MALICIOUS

PDF

82.2 KB Created: 2021-09-16 08:00:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 0524b24a2843492223abac1d92b366d8 SHA-1: 97790890b93c0bcb0108ccaa0ee4814f998225bc SHA-256: 8e6871eadb94cdc727790f817abb27a667f970b7bff69572980c7a961dc04861
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous URLs, many of which are part of a link farm designed to obscure the final malicious destination. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' and the ClamAV detection 'Pdf.Phishing.Trojan-d2528dad23a95d95-10044376-0' strongly indicate a phishing or malware distribution attempt. The embedded JavaScript is likely used to facilitate the redirection or download of a secondary payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://www.biharikft.hu/bihari-admin/ckfinder/userfiles/files/jezesizorotapujubewu.pdf In PDF document text
    • https://kidneystonetreatment.in/userfiles/files/vomel.pdfIn PDF document text
    • https://chuyennhakienvangvn.net/upload/files/88948629626.pdfIn PDF document text
    • https://jungleflightchiangmai.jungle-flight.com/Uploads/files/semonubate.pdfIn PDF document text
    • http://sellmysayarah.com/userfiles/files/26887591678.pdfIn PDF document text
    • http://macautemple.com/userfiles/file/69997412186.pdfIn PDF document text
    • http://wabasnb.com/files/fckeditor/file/137855541761404e3b41407.pdfIn PDF document text
    • http://i-harmonics.com/upload/files/23369411802.pdfIn PDF document text
    • https://www.anoregmt.org.br/ckeditor/ckfinder/userfiles/files/8765310763.pdfIn PDF document text
    • https://balbok.net/admin/ckfinder/userfiles/files/wopodesameguzagines.pdfIn PDF document text
    • http://rem-proekt.com/f/file/xizuxasaxudije.pdfIn PDF document text
    • https://floraplant.gr/FCKeditor/userimages/file/6468083292.pdfIn PDF document text
    • http://quimis.org/js/ckfinder/userfiles/files/11669020267.pdfIn PDF document text
    • https://chataigne-cevennes.fr/imgs/files/79441088625.pdfIn PDF document text
    • http://www.anclupnapoli.it/userfiles/file/93862335143.pdfIn PDF document text
    • http://hanilkwanla.com/uploads/files/81644159347.pdfIn PDF document text
    • http://kjphotocon.org/data/userfiles/files/rajovosibapiperuribavobi.pdfIn PDF document text
    • https://www.kiakaha.gr/wp-content/plugins/super-forms/uploads/php/files/tm3l48ech2udpij2l32k4rc52f/76506971476.pdfIn PDF document text
    • http://yalcinsezer.com/upload/ckfinder/files/75504237214.pdfIn PDF document text
    • http://lifecare4all.com/upload/files/xivelerukogijelurit.pdfIn PDF document text
    • http://okfilm.kr/userData/board/file/dobabenozerulagolamozoda.pdfIn PDF document text
    • https://www.scmsgroup.org/ckfinder/userfiles/files/10476338029.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=iso+file+of+windows+10+free+downloadPDF 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_off0000e081.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE081 16392 bytes
SHA-256: c2722ca754861615174350557c92c0c4b1150dace6ec4f275279e549b3e2e907
font_01_sfnt_off00010ad4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10AD4 10460 bytes
SHA-256: 17f3c54aaac6fbef7b8843ea7f8a25ec31f22b33b403a7411557fda9797e7ae0
font_02_sfnt_off000122c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x122C9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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