Malicious PDF — malware analysis report

Static analysis result for SHA-256 9e982fbc4db85b00…

MALICIOUS

PDF

75.8 KB Created: 2021-03-03 17:02:28 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: 928a12fb94843510a666fa7a3c08054b SHA-1: aee916954de4bbb0f78e71ca64c53ebb0eed9627 SHA-256: 9e982fbc4db85b006037622f190563f040398b5659117a5e061035bd8ad9dedc
174 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious File T1059.007 JavaScript

The PDF document employs a social engineering lure, presenting itself as a 'Google chrome flash player replacement' to trick users into downloading a malicious file. The heuristic 'SE_BROWSER_INSTALL_LURE' strongly indicates this intent. Multiple external URLs are present, with at least one (`http://fredo.run/bluecoat_proxy_deployment_guidevl2ym.pdf`) appearing to be a direct download link for a PDF, suggesting a multi-stage attack. The ML classifier also flagged this PDF with high confidence.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Browser extension / update installation lure high SE_BROWSER_INSTALL_LURE
    Document tells the user to install a browser extension, plugin, viewer, or browser update to view content — a common social-engineering path for credential theft and malware installation
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://bologen.ru/123?utm_term=google+chrome+flash+player+replacement PDF link annotation
    • http://fredo.run/bluecoat_proxy_deployment_guidevl2ym.pdfIn PDF document text
    • http://fazejajogavu.medianewsonline.com/tudowevezef.pdfIn PDF document text
    • http://puwexakibo.iblogger.org/23379444708.pdfIn PDF document text
    • http://reawont.online/roragolwbpy.pdfIn PDF document text
    • http://surulefej.iblogger.org/focusrite_scarlett_18i8_3rd_gen_manual.pdfIn PDF document text
    • http://tidirakozodawon.getenjoyment.net/how_many_calories_does_a_western_omelet_have.pdfIn PDF document text
    • http://difavusimope.iblogger.org/camera_fv_5_crack.pdfIn PDF document text
    • http://grampus-shop.com/ginolevidouqiry.pdfIn PDF document text
    • http://pigigozoruda.mypressonline.com/fimiparukusatenofi.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://makakanow.onlinewebshop.net/devi_bhagavatam_tamil.pdfIn PDF document text
    • http://wiwosotu.myartsonline.com/asp.net_mvc_dropdownlist_selectedindexchanged.pdfIn PDF document text
    • https://s3.amazonaws.com/pibabopuduj/latest_android_phones_in_pakistan_2018.pdfIn PDF document text
    • http://nazifaba.rf.gd/10592837516.pdfIn PDF document text
    • http://figapow.epizy.com/94589917351.pdfIn PDF document text
    • http://zowofiz.myartsonline.com/quran_arabic_urdu_translation_download.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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000eb84.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB84 5560 bytes
SHA-256: 79ac9d341e0fc6abf8844493091be28affd8b31aff78dc5d838c5e2fe22e09b0
font_01_sfnt_off0000fe57.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE57 10336 bytes
SHA-256: b4456107cb02f2c14b853144cd511c32f00f52432415e828bf9f8252d75c1a10

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