Malicious PDF — malware analysis report

Static analysis result for SHA-256 23e03ebf47db7e4e…

MALICIOUS

PDF

77.2 KB Created: 2021-04-16 00:52:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: b4acfbe167031abf32b03ae9d1904797 SHA-1: 5093facb6252b74c4997f9dc7eb925791e8198d0 SHA-256: 23e03ebf47db7e4ee729b913c8b9dd46d18543ea7c8b219f069c4f5f3481fdaf
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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/strik?utm_term=reading+comprehension+grade+3+online+games PDF link annotation
    • http://megalit-korolev.ru/45655798009esitu.pdfIn PDF document text
    • https://sidasunepur.weebly.com/uploads/1/3/6/0/136088000/3269508.pdfIn PDF document text
    • https://molilavavabofu.weebly.com/uploads/1/3/5/9/135989114/9fcbe5434c.pdfIn PDF document text
    • http://sdfafq.info/weather_report_in_amritsar_cityw2z1i.pdfIn PDF document text
    • http://kefagotijuxe.iblogger.org/xesapizebi.pdfIn PDF document text
    • https://vobudofokivelux.weebly.com/uploads/1/3/4/5/134599261/3828279.pdfIn PDF document text
    • http://mikovil.mywebcommunity.org/how_to_do_a_character_count_in_word.pdfIn PDF document text
    • http://coins24h.com/fujoxideweziburosedexerxb4ak.pdfIn PDF document text
    • http://vinnipoh.fun/fixamepalelu854qc.pdfIn PDF document text
    • http://nexipufogavajid.getenjoyment.net/nejusamebugagabib.pdfIn PDF document text
    • http://birebap.scienceontheweb.net/6932392487.pdfIn PDF document text
    • https://sogatawinasefe.weebly.com/uploads/1/3/4/3/134327891/d5dc3ac.pdfIn PDF document text
    • http://axacheat4.xyz/which_wood_is_best_for_whittlingqq4xi.pdfIn PDF document text
    • http://lilubaxubaxulu.sportsontheweb.net/bawizokox.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://supajiwa.myartsonline.com/insulin_structure_and_function.pdfIn PDF document text
    • http://vegubom.atwebpages.com/linear_equations_with_fractions.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/071c44cb-96d8-499f-afa7-e9c889709fcc/subtraction_worksheets_borrowing_2_digits.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e8493f0d-bbe3-4125-a875-08ea8b96cb68/tugozomubuvuletuz.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/afc9b951-9055-4081-80d2-43bcb5f27d33/stanley_shop_vac_6_gallon_filter.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e928b4dd-ba12-4626-9256-874a899214a7/what_is_the_theme_of_the_book_the_curious_incident_of_the_dog_in_the_nighttime.pdfIn PDF document text
    • http://xeravujowa.epizy.com/antivirus_gratis_android_migliore.pdfIn PDF document text
    • http://jaxunukologefis.onlinewebshop.net/sharp_aquos_how_to_turn_on.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6feb388b-46da-45e4-8ea2-aee1e3868014/murilibiro.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_off0000ef0f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF0F 5656 bytes
SHA-256: e740626708662204179555b23013e25e6bb7d5171c80cfcbeb22bfab949ac40d
font_01_sfnt_off00010228.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10228 10356 bytes
SHA-256: dd63b85c839a9554c0bc1e4eb35381c67c6f4f3fd0ca3057909c2e3dc83bc621