Malicious PDF — malware analysis report

Static analysis result for SHA-256 2be00480837ae721…

MALICIOUS

PDF

79.6 KB Created: 2021-03-28 21:20:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 955a2c8d388abb82adc57ef733333425 SHA-1: 7431c87ff6cb4f27e22c8c7fc70942d5d6de8851 SHA-256: 2be00480837ae72123a34a5497a4668f16428808105ded7d819f98b8f35e8632
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, with one pointing to 'kuzutuzo.ru' which is suspicious. The ClamAV detection and ML classifier strongly indicate maliciousness. The presence of embedded links and the heuristic 'PDF_SEO_LINK_FARM' suggest an attempt to distribute malicious content or engage in phishing by mimicking legitimate search results or document downloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://kuzutuzo.ru/wix?keyword=2006+nissan+altima+repair+manual+free+download
    • https://mubujibazakob.weebly.com/uploads/1/3/3/9/133986275/wakekaxavuzesetewali.pdf
    • http://dvigatel.guru/boat_driver_license_texas_appointmentr7c1k.pdf
    • http://se-mrush.com/raresezotivupek832je.pdf
    • https://cdn.sqhk.co/nesadatifu/hjsgjja/ddpai_mini_3_vs_70mai_pro.pdf
    • https://cdn.sqhk.co/jiwosowo/5A4haUL/93211075127.pdf
    • https://detimuveruriwus.weebly.com/uploads/1/3/1/8/131872178/2630456.pdf
    • http://accueilcmb.com/touch_of_class_bedding_purple4vt3e.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://s3.amazonaws.com/wikurixobelu/menabatigabavuviliduko.pdf
    • https://s3.amazonaws.com/fewunadupop/71730966557.pdf
    • https://s3.amazonaws.com/rerinago/86221839633.pdf
    • http://dizojid.rf.gd/possessive_adjective_worksheet_for_grade_1.pdf
    • https://s3.amazonaws.com/xakapudakadu/palukituweja.pdf
    • http://nifopufu.epizy.com/lulegazutepugidixo.pdf
    • https://s3.amazonaws.com/sojaxub/94101747234.pdf
    • http://molugafew.epizy.com/evaluation_report_template_word.pdf
    • https://s3.amazonaws.com/sigobija/popular_black_boy_names_that_start_with_j.pdf
    • https://s3.amazonaws.com/rikolesafuwofar/93262531854.pdf
    • http://tefezitewo.rf.gd/aberration_of_light.pdf
    • https://s3.amazonaws.com/vixuwogetiv/audio_technica_lp60_wireless_speakers.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000eb55.bin
93c95d8e5b52fbb2a6ae4fb0e40800354d32c371b7da7dc3a5db13319da67654		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEB55 5496 bytes
font_01_sfnt_off0000fdea.bin
c96ee886a9e57ef675787571447a2965d894fcf9ddd142711ae49f795c46db85		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFDEA 10688 bytes
font_02_sfnt_off0001224c.bin
1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1224C 4324 bytes

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