Malicious PDF — malware analysis report

Static analysis result for SHA-256 35cc6021af473bd8…

MALICIOUS

PDF

81.0 KB Created: 2021-09-18 15:49:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: c9e615775708b330dd30fb6f38711ba4 SHA-1: 6fd2dad71b62ed502975818b630b364e5a94481f SHA-256: 35cc6021af473bd8900dd555edae1b16e8266a5753702d9615175becdef67b00
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a significant number of external URIs pointing to disposable domains, indicating a malicious intent to redirect users. The ML classifier and ClamAV detection strongly suggest this PDF is a phishing or trojan delivery mechanism. The embedded JavaScript likely facilitates the redirection or download of a secondary payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://smidgel.ru/uplcv?utm_term=how+to+install+downloader+on+android+tv+box PDF link annotation
    • https://luxm.pl/userfiles/file/16447219957.pdfIn PDF document text
    • http://sten.kr/club/data/userfiles/file/20210915171230.pdfIn PDF document text
    • https://grahampropertytax.com/wp-content/plugins/super-forms/uploads/php/files/cc5ba48251cf6e7f373f2fedcccd8b5a/piduguli.pdfIn PDF document text
    • https://snpwachq.com/files/js/ckfinder/userfiles/files/zowodosaberufunufuzikukup.pdfIn PDF document text
    • http://webbolt.fono.hu/data/editorfile/wasesinutaxawoxuwogesorim.pdfIn PDF document text
    • http://medwin.kr/userData/board/file/masogepatisizukenexigape.pdfIn PDF document text
    • https://madeirashopping.com/userfiles/file/jarutapafegavudojonuvox.pdfIn PDF document text
    • http://alrabbancapital.com/file/files/18551257101.pdfIn PDF document text
    • http://food-cloud.com/home/food-cloud/www/site/site/data/files/tepikofudevokelok.pdfIn PDF document text
    • https://nacionalequipamentos.com/ckeditor/uploads/files/mekotekewilisexikanidoluk.pdfIn PDF document text
    • http://zeshengtecphar.com/UploadFiles/FCKeditor/20210916101107.pdfIn PDF document text
    • http://jongauger.com/ckfinder/userfiles/files/94499642505.pdfIn PDF document text
    • http://oldadmin.k12cart.com/media/files/7350621624.pdfIn PDF document text
    • https://o2opr.co/userfiles/files/40446192673.pdfIn PDF document text
    • https://stdtekstil.com/upload/ckfinder/files/matedamel.pdfIn PDF document text
    • https://soswzgierz.pl/web/uploads/files/15285435174.pdfIn PDF document text
    • http://businessplan-capalpha.eu/mbp/upload/images/images/upload/ckfinder/dobugevovotulaveduzew.pdfIn PDF document text
    • http://duocthientam.com/uploads/ckfinder/files/16674280266.pdfIn PDF document text
    • http://hoteldanang.vn/uploads/images/files/jukoxowamijobusopadugope.pdfIn PDF document text
    • http://alcantara.cz/data/file/jepiraneperi.pdfIn PDF document text
    • https://anninhsieuthi.online/upload/files/53327899963.pdfIn PDF document text
    • http://mis.nrru.ac.th/gradjournal/ckfinder/userfiles/files/40015348840.pdfIn PDF document text
    • https://travels-ukraine.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f80d50f8b0---rarafuwa.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_off0000d66e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD66E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ee80.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE80 17940 bytes
SHA-256: 73030c0f0ff516b7edee8f3a7a6ffcdd2764386d40e0b6fbefdda60221e7279b
font_02_sfnt_off00011daa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11DAA 10624 bytes
SHA-256: 33b50a442d7cfef8bb2218e9eb374db6edfaceb05487b75e74cc159575de64e5