Malicious PDF — malware analysis report

Static analysis result for SHA-256 55febfe3b81136af…

MALICIOUS

PDF

74.4 KB Created: 2021-03-19 04:05:44 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: cac8604ca51517c5e493f877827ea21b SHA-1: e991d99758fd86dcf46ac20eee259fd0ac18725f SHA-256: 55febfe3b81136af0965145208633f3e1868e72df1ff3195c1d64c0fb517b6c6
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, indicating a phishing or trojanized document. It contains numerous external URIs, many hosted on disposable domains, suggesting a link farm or redirection scheme to deliver malicious content. The presence of embedded URLs and the overall structure point towards an attempt to trick users into downloading further malware or visiting malicious sites.

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://maypoin.ru/award?keyword=cristianismo+puro+e+simples+pdf+download+gratis PDF link annotation
    • http://wolifote.getenjoyment.net/high_tibial_osteotomy_procedure.pdfIn PDF document text
    • http://dupuladusudired.mypressonline.com/ncert_maths_textbook_class_8_free_download.pdfIn PDF document text
    • http://zogometemo.sportsontheweb.net/34296302374.pdfIn PDF document text
    • http://jebewif.22web.org/what_do_sex_and_the_city_cast_look_like_now.pdfIn PDF document text
    • http://kujedepis.22web.org/what_does_bills_of_exchange_mean.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4407724/normal_6032e62fc910c.pdfIn PDF document text
    • http://bapatavusirave.mygamesonline.org/kijusuzamijaxowedef.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4411220/normal_5ffc7d16ecfd8.pdfIn PDF document text
    • http://jetotujaj.iblogger.org/algebra_maths_genie.pdfIn PDF document text
    • http://baramijotafexo.mypressonline.com/sap_display_inbound_delivery_list.pdfIn PDF document text
    • http://pipawopozovifo.iblogger.org/baucis_and_philemon_story.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://segixiw.epizy.com/outgoing_correspondence_register_template.pdfIn PDF document text
    • http://notijukigexu.rf.gd/jiramoli.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a87cbda5-a1f3-461e-9995-4b9d4b6eef9f/marvel_movies_in_order_of_release_date_on_disney_plus.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c067978c-fd99-48c6-8a3f-7074e118cf79/pokemon_sword_guide_book_download.pdfIn PDF document text
    • http://vubelifijam.atwebpages.com/fe_exam_study_material.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c93e8b76-f2f6-4434-94f1-56dd35fe2f61/what_does_error_code_1009_on_netflix_mean.pdfIn PDF document text
    • http://tiwufuwivuvuf.epizy.com/73432761046.pdfIn PDF document text
    • http://gevejonitu.onlinewebshop.net/kelly_services_work_from_home_apple.pdfIn PDF document text
    • http://losopokatefoxot.rf.gd/pakefujuxiwinebivuxemakog.pdfIn PDF document text
    • http://daxizupalapa.rf.gd/garmin_vivofit_3_activity_tracker.pdfIn PDF document text
    • http://woxikajir.myartsonline.com/josipevukatufo.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_off0000de82.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE82 5356 bytes
SHA-256: 241ae357f57af203ffc0780ee73d4d72cb9c228e20d1c1ab6ce4e210c1b25ab3
font_01_sfnt_off0000f0b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0B8 13224 bytes
SHA-256: 106859ec4f9e4633aea7c50e825bad5a53adb0f91dd2c12c163fc20a2620b3c2

Open this report in the interactive analyzer, or submit your own file for analysis.