Malicious PDF — malware analysis report

Static analysis result for SHA-256 23e3e3c188e4c02c…

MALICIOUS

PDF

78.4 KB Created: 2021-05-15 06:05:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: fb122cc7fb6c9d2cb8b6b8f7738500fb SHA-1: 8bafec8337a40a3f0422bb8d77159f8449b64f43 SHA-256: 23e3e3c188e4c02c01fcc003c9bb1fa3081088926a4b7f9db5265d0b4d519d5e
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 of which point to disposable domains and are structured as link farms, indicating a probable attempt to redirect users to malicious sites. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly suggests this is a phishing or malware distribution lure.

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://ponafet.ru/strik?utm_term=gospel+of+the+flying+spaghetti+monster
    • http://hs-life.ru/1727949887btmc9.pdf
    • https://cdn-cms.f-static.net/uploads/4403408/normal_600aa3d865dce.pdf
    • http://cherrypimp.online/13467537414y0xo9.pdf
    • http://playmarket-online.com/does_anyone_make_a_smart_tv_with_built_in_dvd_playerzb1a6.pdf
    • http://byseles.xyz/40951092473lkum0.pdf
    • http://numidib.22web.org/foviwetetifusew.pdf
    • https://cdn-cms.f-static.net/uploads/4426832/normal_605d3ec397fb6.pdf
    • http://creditscoreusa.info/vefevimupoxebuxan231it.pdf
    • http://storeyou.store/bifafananesegukikosodakital52b.pdf
    • http://missunik.space/call_of_duty_mobile_apk_awardur1e3.pdf
    • http://sikutamilom.iblogger.org/homework_answers_app_science.pdf
    • http://myfavoritesun.xyz/literature_review_example_mla_formatlyyto.pdf
    • http://tpdreport.com/toniwhfjv8.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://leribilif.rf.gd/non_probability_sampling.pdf
    • http://getidevip.epizy.com/zonugedituzibiletesogeli.pdf
    • https://s3.amazonaws.com/rebomedug/chassis_number_format_india.pdf
    • http://lubudag.epizy.com/arbitration_conciliation_act_1996.pdf
    • http://volitig.rf.gd/ejercicios_categorias_gramaticales_2_eso.pdf
    • https://s3.amazonaws.com/penale/zevovukenumitufa.pdf
    • http://gogewafusa.rf.gd/24234576810.pdf
    • http://pikotesewelum.epizy.com/rirutavetenagamikitexekar.pdf
    • https://s3.amazonaws.com/zaxawetawupo/irrational_numbers_worksheet_answers.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_off0000f384.bin
06ac55c7e80588566e648fc8076f081b9e8cda9b578dcd6ae647a09c7d65506d		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF384 5448 bytes
font_01_sfnt_off000105f0.bin
2b674bc5242859f8fa9d6f205e262c42f9b0d4b90e4ce860ff26789707eafa81		 pdf-font-stream PDF embedded font (sfnt) at offset 0x105F0 11304 bytes

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