Malicious PDF — malware analysis report

Static analysis result for SHA-256 2b2d8a69227a2602…

MALICIOUS

PDF

75.2 KB Created: 2021-02-24 22:19:06 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-07
MD5: b42cd4a17c60c8ddf00bea6b2aa43ddb SHA-1: 147950d08d452f0bfc5ad39456242958f95dd59a SHA-256: 2b2d8a69227a2602dea027ca7c6a99e0747a400eb7719c937e06cef1b5414675
126 Risk Score

Malware Insights

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

The PDF contains multiple embedded URLs, with a primary focus on 'baarspo.ru', suggesting a phishing or redirection attempt. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a pattern of using disposable hosting for numerous links, further supporting a malicious intent. The ML classifier and ClamAV detection strongly indicate this PDF is malicious, likely serving as a lure to a phishing 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://baarspo.ru/strik?utm_term=psychological+testing+for+adhd+in+adults PDF link annotation
    • http://bluebadge-support.com/how_to_change_firex_smoke_alarmgzguz.pdfIn PDF document text
    • https://jupurelapuloful.weebly.com/uploads/1/3/3/9/133997255/sovefoja.pdfIn PDF document text
    • https://nurosizakudagag.weebly.com/uploads/1/3/4/6/134699554/b97235c.pdfIn PDF document text
    • http://1ux.site/android_accelerometer_sensorvyfev.pdfIn PDF document text
    • http://ropufogesuzazeg.iblogger.org/taekwondo_black_belt_form_taebaek.pdfIn PDF document text
    • https://cdn.sqhk.co/zumedizojas/0ZXghhg/paris_texas_full_zip_code.pdfIn PDF document text
    • https://cdn.sqhk.co/sifilefu/bHujgj2/crazy_zombie_9._0_hacked_unlimited_money.pdfIn PDF document text
    • http://pefiworawodud.mypressonline.com/xogimilaruxiriwipusobo.pdfIn PDF document text
    • http://lulopoboxefon.scienceontheweb.net/wiperevexuvozuvitodeva.pdfIn PDF document text
    • http://voirly.xyz/how_to_change_honda_pilot_alternatorsjafa.pdfIn PDF document text
    • http://fimewot.xyz/pvr_iptv_simple_client_2_zip_download6ni63.pdfIn PDF document text
    • https://pipedexow.weebly.com/uploads/1/3/4/8/134852679/pikafugojegotaw.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://pepebejawu.epizy.com/98763582835.pdfIn PDF document text
    • http://wugujub.onlinewebshop.net/15856441667.pdfIn PDF document text
    • http://zudupaxub.myartsonline.com/lizutupuvekobut.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_off0000ea69.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA69 5388 bytes
SHA-256: ed8b4144abf734e10ffd0d659f9ebdcc48e04467276325b422bbf069990f5666
font_01_sfnt_off0000fcc0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCC0 10292 bytes
SHA-256: ab420903a9b110874bf7ad2533ea5be78ec438683868bf8d34ebbe4c34411ee7

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