Malicious PDF — malware analysis report

Static analysis result for SHA-256 efa94402408304a6…

MALICIOUS

PDF

74.5 KB Created: 2021-04-08 20:21:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: ea99093a3b1774a80d29da14080e0809 SHA-1: cf4d37725ff10d8dc6b93f825537f58ee840e8e4 SHA-256: efa94402408304a6b5ac6b677d260308462d16b16af75c0f3c9bfd922ccb9e34
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF file was flagged as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains numerous embedded URLs, with at least one pointing to a suspicious domain ('nipisod.ru') that is likely used for phishing or malware distribution. The 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic further suggests a deliberate attempt to create a network of links for malicious purposes.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://nipisod.ru/strik?utm_term=matar+a+un+ruise%25C3%25B1or+filmaffinity PDF link annotation
    • http://dupipavigojas.iblogger.org/jutorilu.pdfIn PDF document text
    • http://fanuladazenozip.iblogger.org/acara_curriculum.pdfIn PDF document text
    • http://vir-tus.com/valizalorarifapamefujofubyajwl.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4470968/normal_5fd8bcd764f82.pdfIn PDF document text
    • http://tryplafond.xyz/12635441071uqo9t.pdfIn PDF document text
    • http://zujazufomok.iblogger.org/glioblastoma_multiforme_nuove_cure.pdfIn PDF document text
    • http://teksol.xyz/tratar_la_balanitis_de_forma_naturald0jyo.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4481403/normal_5fefe0146a298.pdfIn PDF document text
    • http://nicechange.space/210176342490rjiu.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4450890/normal_5ff7ff941c2e5.pdfIn PDF document text
    • https://cdn.sqhk.co/bezifowo/KBjaWig/blackpink_forever_young_song_free.pdfIn PDF document text
    • https://cdn.sqhk.co/goberirud/eiahiaA/61914479676.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://e06e8306-d71e-4c92-aa1b-e8c52eeb44cb.filesusr.com/ugd/bc4951_a36bd08f019a4e81b697fd4ce54f9ca2.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/493dae1c-57c1-4718-a132-fabdbe96a224/dr_gottfried_hormone_reset_diet.pdfIn PDF document text
    • http://sezajuvijib.rf.gd/zemikiripejurugotepe.pdfIn PDF document text
    • https://22449060-8e30-4723-8828-967625cce342.filesusr.com/ugd/eddc50_fc639e46bc2844b880d007cdbfa20c29.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/1fa01298-9684-4612-b5b6-7c2d1d49029a/relion_blood_pressure_monitor_calibration.pdfIn PDF document text
    • http://sadamenukovizep.epizy.com/2020_budget_speech_zambia.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4a957d0b-be1b-4880-a293-7e112166e455/bogafotaxitexejem.pdfIn PDF document text
    • https://c24d0846-efa5-4754-a822-a7dc8f88f2d4.filesusr.com/ugd/7b2abd_942e9ca1365d4f5098aad686a066cf71.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/c2f9f8fe-7999-4509-9aa3-251d09c62600/72252024366.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_off0000e393.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE393 5232 bytes
SHA-256: 1d8d253e29ab216cd3f85a4a13ab711e8aa90297bcd7fcaf5316b0ed76db8765
font_01_sfnt_off0000f518.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF518 11468 bytes
SHA-256: b83eed0a395a16fc64a11679c28150c6bba3472795573f72b544f936aaa49797

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