Malicious PDF — malware analysis report

Static analysis result for SHA-256 8f4afe5322091888…

MALICIOUS

PDF

79.9 KB Created: 2021-04-24 20:31:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: 466d641c36dea4e0e26ead3d0eb12551 SHA-1: 4fa1eae2f523a6ab1a79df218f4bdca17f8e2ee9 SHA-256: 8f4afe532209188830d58e3d9dee31157d78a6f0084b8c818f26142e3d1e27d7
264 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document contains numerous embedded URLs pointing to disposable domains and known malicious redirectors, indicating a phishing or malware distribution attempt. The 'SE_CLIPBOARD_COMMAND_LURE' and 'SE_LOLBIN_RUN_COMMAND' heuristics suggest the document instructs users to copy and paste commands into a shell, a common technique for downloading and executing further malicious content. The ML classifier and ClamAV detection strongly support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • Clipboard command execution lure high SE_CLIPBOARD_COMMAND_LURE
    Document tells the user to copy or paste clipboard content into Run, PowerShell, cmd, or another shell-like execution context
  • LOLBin token sequence in document text high SE_LOLBIN_RUN_COMMAND
    Extracted document text contains a Windows script/execution tool name (PowerShell, mshta, cmd, rundll32, regsvr32, …) within 220 characters of a dangerous flag, command verb, or URL. This is a visible 'run this' instruction in HTML/PDF/RTF lure bodies, or — in macro-laden Office files — the macro's own string-pool entries appearing adjacent in extracted text.
  • 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.
  • 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://crophysi.ru/strik?utm_term=true+colors+test+meaning In PDF document text
    • http://vienvozvrat.site/468396930309h8hn.pdfIn PDF document text
    • http://sosed.market/is_chinatown_in_san_francisco_safe4sxnb.pdfIn PDF document text
    • http://gikodarekegov.mywebcommunity.org/20217563872.pdfIn PDF document text
    • http://nesobaka9.xyz/which_intermolecular_forces_are_found_in_hydrogen_fluoridey6xoj.pdfIn PDF document text
    • http://nezatarofarix.getenjoyment.net/cambridge_preliminary_english_test_1_with_answers_2cd.pdfIn PDF document text
    • https://cdn.sqhk.co/gelowidabik/iijjdjb/transmission_electron_microscope.pdfIn PDF document text
    • http://podarokinsta.site/small_gps_tracking_pets4krzm.pdfIn PDF document text
    • http://buzevuzelape.mywebcommunity.org/raag_bilawal_notation.pdfIn PDF document text
    • http://copyrighthelpptteam.com/mojewasujimitexof7d69k.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4485579/normal_605d807521bab.pdfIn PDF document text
    • http://lnstagramcopyrightservices.org/5012362894392cmd.pdfIn PDF document text
    • http://mexicotop3.xyz/41187662905ql5sa.pdfIn macro / runtime command snippet
    • http://vazagitomis.mypressonline.com/52085515740.pdfIn macro / runtime command snippet
    • https://cdn-cms.f-static.net/uploads/4452621/normal_6021aadf2b23b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4476146/normal_6060e677348bd.pdfIn PDF document text
    • https://cdn.sqhk.co/pibexezases/iiihhgD/rabavamudavadizuwoguzet.pdfIn PDF document text
    • https://cdn.sqhk.co/bosamame/oujaCkT/free_live_wallpaper_download_for_windows_7.pdfIn PDF document text
    • http://vufiwopader.medianewsonline.com/anointing_that_breaks_the_yoke.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4421939/normal_601b567ece495.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://xolavozezimodan.onlinewebshop.net/84568331653.pdfIn PDF document text
    • http://rurebafib.onlinewebshop.net/benefejusifa.pdfIn PDF document text
    • http://mojozore.myartsonline.com/5166354423.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_off0000fb87.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB87 5068 bytes
SHA-256: b5434cfcdf64fce41d1274a63a8f6cf76f030234f69b5a0143e80fb63303bf35
font_01_sfnt_off00010caa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CAA 11240 bytes
SHA-256: 89135b11ba651ccad70f0689f8eff451fd93d3a50ae2851c67d46fee96a28eae

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