Malicious PDF — malware analysis report

Static analysis result for SHA-256 f9eb69527eae7da0…

MALICIOUS

PDF

87.7 KB Created: 2021-03-06 01:55:31 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-04
MD5: cf6a633fe06cc8a7785d188129478211 SHA-1: 713044c15dacbb8b2ec24b545cdfd6ba26f82083 SHA-256: f9eb69527eae7da0309212121eddb80c0e89493b64cd7b44cf8be9b208abaae1
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many pointing to disposable domains, and one prominent URL suggests a lure for watching a movie online. The presence of external URIs and the link farm heuristic indicate an attempt to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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.
  • 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://zajinet.ru/strik?utm_term=pride+and+prejudice+movie+1995+watch+online PDF link annotation
    • http://rubewox.sportsontheweb.net/81365637323.pdfIn PDF document text
    • http://beliyden.xyz/what_is_the_difference_between_roku_premiere_plus_and_ultraktu2e.pdfIn PDF document text
    • https://cdn.sqhk.co/lozuzupadis/gijEHhg/wood_joints_for_tables.pdfIn PDF document text
    • http://edarudost.online/95719154128v2dsu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370987/normal_6037250b1f4d4.pdfIn PDF document text
    • http://xrootunited.com/xizefekedz1ezf.pdfIn PDF document text
    • http://maleev.online/75217343706n4lyi.pdfIn PDF document text
    • https://cdn.sqhk.co/letaziseb/QC0JgfR/losamuxamesuronuju.pdfIn PDF document text
    • https://cdn.sqhk.co/munuluxel/rYhKajf/maxebageluk.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403539/normal_6011c7d29c530.pdfIn PDF document text
    • http://salebox.shop/30933650966n1q30.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4420776/normal_600e373b83e4e.pdfIn PDF document text
    • http://twobigs.space/thinking_out_loud_chords02lie.pdfIn PDF document text
    • http://wulutapebime.getenjoyment.net/tuvemapidelalopusaku.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/baxadelefofibuz/ritomu.pdfIn PDF document text
    • http://jibimom.myartsonline.com/bose_awr1-1w_antenna.pdfIn PDF document text
    • https://s3.amazonaws.com/tibanepoxilibud/the_gastrocnemius_and_soleus_perform_what_action.pdfIn PDF document text
    • https://s3.amazonaws.com/jevedijadiki/supugovivudelarip.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_off00011a03.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A03 5696 bytes
SHA-256: d4b7067220a1254d6b4cfdf3102152d8533a5807d11ce69f4e6a6e4c07ddd681
font_01_sfnt_off00012d66.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D66 10552 bytes
SHA-256: f69b8eba820357f0690ff1156cd44297f5d8ad0e393c38c62177753621b072ee

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