Malicious PDF — malware analysis report

Static analysis result for SHA-256 e3082e8be69f59c6…

MALICIOUS

PDF

75.2 KB Created: 2021-09-14 06:43:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 3230a2dd1d4c74600477762670de1a5c SHA-1: 9b2bd68520c6d0c1354c5765a0935d12a95fa824 SHA-256: e3082e8be69f59c630aad65b58b70f9adb604eaaa9fd2634b089602c32705217
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier as malicious. It contains numerous embedded URLs, many of which are part of a link farm designed to redirect users to potentially malicious content, indicated by the 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic. The presence of external URIs and the overall structure suggest an attempt to trick users into downloading further malware or engaging in phishing activities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 5

  • 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.
  • 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://huntic.ru/uplcv?utm_term=kabir+singh+full+hd+movie+download+1080p
    • http://jubangh.com/Upload/FckUpload/20210903file///5343820692.pdf
    • https://iveducentar.com/uploads/assets/file/93376470185.pdf
    • http://sonarkella.com/userfiles/file/sopedid.pdf
    • http://cosmikkino.ru/sadm_files/24055375068.pdf
    • https://mauspro.net/upload/files/jolupezezexukojatob.pdf
    • https://coolinterier.sk/upload/files/96733697708.pdf
    • http://piazzademarini3ge.com/userfiles/files/situkawonunivawanidegojuw.pdf
    • http://bannails.com/fckeditor_userfiles/file/pifofilive.pdf
    • http://apsara.ru/userfiles/file/37246237888.pdf
    • http://gr-chem.com/upload/files/54006216879.pdf
    • https://jpt.mysmartedu.com/uploadimages/files/19638487549.pdf
    • http://terralis.net/catalogue_dynamique/file/61913454704.pdf
    • https://vaitinhdien.com/app/webroot/upload/files/42568762033.pdf
    • http://shahgrp.com/uploads/4675939150.pdf
    • http://asja-doll.ru/userfiles/file/jarowobogifuta.pdf
    • https://www.disbel.es/ckfinder/userfiles/files/werifiwadolukufif.pdf
    • http://ingegneriarossi.it/userfiles/files/xixufadut.pdf
    • http://goang-hann.com/uploads/files/202109121251518922.pdf
    • http://oishisushigd.com/uploads/files/19310351130.pdf
    • https://www.truesdalepainting.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c1f81add92---pujotobexalezedowabosup.pdf
    • http://taiwangallant.com/uploads/files/202109072027498144.pdf
    • http://valeneighbors.com/userimages/revurolamogine.pdf
    • http://104408017.linker.tw/files/18537750939.pdf
    • https://www.accidentinjurylascruces.com/wp-content/plugins/super-forms/uploads/php/files/ifjv320cuv1iklfci3mh0a46b4/98639110288.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_off0000bf82.bin
4eaebceb1d7d763d9c011829dd2b0ee411c47e36f4a9410ac59eff60932a90fa		 pdf-font-stream PDF embedded font (sfnt) at offset 0xBF82 17228 bytes
font_01_sfnt_off0000ebdb.bin
14b4bb67866bd27abbe4434a4e976b09228cb008c2feb86d4df8c6f4856756af		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEBDB 11612 bytes
font_02_sfnt_off000106ea.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x106EA 16792 bytes

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