Malicious PDF — malware analysis report

Static analysis result for SHA-256 72e40b7e602ba1d5…

MALICIOUS

PDF

74.0 KB Created: 2021-03-24 22:22:55 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 885cde600ba2508bcdc2691184e9fd19 SHA-1: 2f1969c5e5154f237105ad523d652e3885c7bf04 SHA-256: 72e40b7e602ba1d58e8e17043df08a1b0103b8f74d24c83382825d3fa46a2c25
126 Risk Score

Malware Insights

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

The PDF file contains embedded URLs that redirect to external websites, one of which is identified as a link farm on disposable hosting. The document body, though heavily obfuscated, appears to be a lure related to an 'earthworm anatomy label the diagram answer key'. The presence of multiple external URIs and the ML classifier's high confidence score indicate a malicious intent, likely to direct users to a phishing or malware distribution site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://lozipotod.ru/123?utm_term=earthworm+anatomy+label+the+diagram+answer+key
    • http://tonozezoziw.iblogger.org/letamubiwobe.pdf
    • https://cdn-cms.f-static.net/uploads/4491669/normal_60512f75db55a.pdf
    • https://static.s123-cdn-static.com/uploads/4376120/normal_5ffbe4921ecab.pdf
    • https://cdn-cms.f-static.net/uploads/4481273/normal_605858011cffb.pdf
    • http://ketoxitigojaluk.sportsontheweb.net/57885195017.pdf
    • https://cdn-cms.f-static.net/uploads/4498801/normal_602ee1124a6a9.pdf
    • https://static.s123-cdn-static.com/uploads/4373986/normal_5fee76a2bcc27.pdf
    • http://nariwunuzaw.scienceontheweb.net/how_to_find_distance_from_velocity_and_time_graph.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://birabigipo.epizy.com/como_fazer_um_resumo_de_um_livro.pdf
    • https://s3.amazonaws.com/wexoteluwag/are_craftsman_wrenches_made_in_the_usa.pdf
    • https://0cc2a7d0-6f33-4335-9ec9-554d9418487e.filesusr.com/ugd/cb4a18_bd99c3ff6785433fbf6500be5ed75a86.pdf?index=true
    • https://b2f02272-107b-4032-aafc-54cdd6265a16.filesusr.com/ugd/6cf392_6c3da37f19024035a89ac8294f7be189.pdf?index=true
    • https://s3.amazonaws.com/ravuxudibure/ssoid_ki_full_form.pdf
    • https://72858ab8-d36f-4bc2-b208-e5ec56e76d01.filesusr.com/ugd/3a4e0e_1e4fc058d7904f01b62e7b5f70035755.pdf?index=true
    • https://8909b315-4d59-4940-aabf-0fdaa532e0ad.filesusr.com/ugd/4542d9_c3c6da1109b447b4964c68facfcd96ce.pdf?index=true
    • https://3e021c9a-284a-4c54-9ba1-f6d43d4d2ba5.filesusr.com/ugd/a619af_3f8a5b2544454ff482f1034b6da43233.pdf?index=true
    • https://add83a7c-0e31-48b3-928b-061d82ba9144.filesusr.com/ugd/205ae4_74d332b4356e4198803897462d4f6e3d.pdf?index=true
    • https://s3.amazonaws.com/xebuvuwov/mokugaferemuwoxixiwu.pdf
    • https://s3.amazonaws.com/kegubinefuda/74121461356.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e435.bin
0d6cae6ad3099787fc388404db598e69e7e7de725cda215420a0be4a0bc7bf2e		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE435 5596 bytes
font_01_sfnt_off0000f728.bin
c99c24798ddc1ccbb1d1225cb055fcf86af5c9af1d72de93bb7111b355e28e65		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF728 10440 bytes

Open this report in the interactive analyzer, or submit your own file for analysis.