Malicious PDF — malware analysis report

Static analysis result for SHA-256 c17a88e4806b29a3…

MALICIOUS

PDF

83.6 KB Created: 2021-09-14 15:54:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 453a295432b7291fe49f274c6ba15076 SHA-1: 2d05497aee887bf687969e25d524aca81c3fde30 SHA-256: c17a88e4806b29a3e828898e0704702f3628f3bf14146f290fba9b4b2ce9ec92
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and is flagged as malicious by ML classifiers and ClamAV. It also exhibits characteristics of a link farm, with numerous links to disposable hosting, suggesting an attempt to distribute further malicious content or phish for information. The presence of embedded JavaScript indicates an attempt to execute code within the user's browser or PDF reader.

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://nirkongrp.com/ckfinder/userfiles/files/47364180871.pdf In PDF document text
    • https://gangwontaxi.com/FileData/ckfinder/files/20210908_F033BA6593C9E065.pdfIn PDF document text
    • https://cheesykeju.com/contents/files/dizepemerokomavazabuvo.pdfIn PDF document text
    • https://izyskately.ru/foto/ck/files/34148321341.pdfIn PDF document text
    • http://trongtinpc.com/luutru/files/92841699586.pdfIn PDF document text
    • https://swapnauraan.com/ckfinder/userfiles/files/dukilup.pdfIn PDF document text
    • http://prefinancovaniehypoteky.sk/res/file/xiwotal.pdfIn PDF document text
    • https://i-chat.tw/js/ckfinder/userfiles/files/xelenikiluweliso.pdfIn PDF document text
    • https://faresaldabbous.com/uploads/file/9600564833.pdfIn PDF document text
    • http://koreaseals.com/ckfinder/userfiles/files/64973285725.pdfIn PDF document text
    • http://wowbond.com/upload/Fckeditor/file/20289202295.pdfIn PDF document text
    • http://www.polni.si/Images/files/werunaw.pdfIn PDF document text
    • https://0800-707-808.com/upload/ckfinder_temp/files/20210902232551.pdfIn PDF document text
    • http://ropesadventure.com/d/files/podedetedavala.pdfIn PDF document text
    • https://itexpertdog.com/upload/files/82590690736.pdfIn PDF document text
    • http://asupuro.com/upload/save_image/files/29566125450.pdfIn PDF document text
    • https://www.hotelrestaurantmacarena.fr/ckfinder/userfiles/files/3039429158.pdfIn PDF document text
    • https://hlj-vibration.com/uploads/image/20210903/files/20210903050141.pdfIn PDF document text
    • https://www.kadinlarsitesi.org/wp-content/plugins/formcraft/file-upload/server/content/files/1613d0c14934d9---33796906632.pdfIn PDF document text
    • https://www.havanasalsa-dance-tours.com/wp-content/plugins/super-forms/uploads/php/files/4272b8146719a04c58730e19bd5f717d/jumojapog.pdfIn PDF document text
    • https://sitycare.com/FCK-UserFiles/files/zofopubepoxozamemojiben.pdfIn PDF document text
    • https://aspit.ro/imagini_ws/78000001369.pdfIn PDF document text
    • https://on-call-anatomist.org/ckfinder/userfiles/files/pedebuf.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=telecharger+jeux+gratuits+pour+tablette+androidPDF 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_off0000dc4a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC4A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f45c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF45C 19432 bytes
SHA-256: 91ed00807ea6ae55cfbad4aff231b5a39194e252620fb65487efa74db2f31a8a
font_02_sfnt_off000124d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x124D8 11228 bytes
SHA-256: 25b81ed8f6cbb8f8b1c13b4b3183a96a0092e512720ffeb9e9264582caf76c7f