Malicious PDF — malware analysis report

Static analysis result for SHA-256 55f245b288f63343…

MALICIOUS

PDF

86.1 KB Created: 2021-03-18 20:35:25 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 1aadfdbedefb682dba799cfa19827c7e SHA-1: 2fb431af83a49c7888c8c9ceffc45d0125287bb3 SHA-256: 55f245b288f633434daee05c4ed218bc23734fc0df0d159b315aad2c9537920f
126 Risk Score
Tags
free-cdn-ebook-manual-lure

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 0.9994

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://soxebez.ru/strik?utm_term=myers+et+al+social+psychology+7th+ed PDF link annotation
    • https://cdn.sqhk.co/titubebojek/iiiqujh/suroterem.pdfIn PDF document text
    • http://newoxoxi.mywebcommunity.org/babukifibalenewolovot.pdfIn PDF document text
    • http://lofoporubatul.mygamesonline.org/51857585928.pdfIn PDF document text
    • https://cdn.sqhk.co/kigoxeni/tuhjJZE/vafotesopula.pdfIn PDF document text
    • https://cdn.sqhk.co/jodariwem/i4hcZje/shuddered_definition_in_spanish.pdfIn PDF document text
    • https://cdn.sqhk.co/mesodimeduje/hehh6hh/hello_kitty_marshalls.pdfIn PDF document text
    • http://jazabezul.iblogger.org/gegeloratalawusazi.pdfIn PDF document text
    • http://fetedeju.mygamesonline.org/50896392497.pdfIn PDF document text
    • http://ketoxitigojaluk.sportsontheweb.net/red_cross_first_aid_courses_saskatoon.pdfIn PDF document text
    • http://lomigizukifomor.22web.org/excel_spreadsheet_compare_2_columns.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://mezuvisudaduvo.epizy.com/20171024820.pdfIn PDF document text
    • http://nujebij.onlinewebshop.net/fowumis.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fcb847ce-770f-430d-8b6d-7f7c86a418f1/30538236019.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4f95208c-6022-477f-b86a-411afb832274/88508997832.pdfIn PDF document text
    • https://s3.amazonaws.com/wexoteluwag/why_is_the_a_big_storm_on_jupiter_never_end.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b4827120-e9f2-4826-b47f-9a06b592670f/is_there_a_new_jack_reacher_book_coming_out.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d2ad30be-3df5-4be5-a9a1-d9dc7cb9982a/translating_grandfathers_house_word_choice.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a6d38e6f-06e6-45a1-9b56-9a29c47f0ff3/types_of_negotiable_instruments_act.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8ac318f6-c40a-49b2-93e7-471dc396a6f1/342359360.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/21606f20-e702-4b27-ab6a-71dcdc901ac6/what_universal_remote_works_with_lg_smart_tv.pdfIn PDF document text
    • http://mafovito.rf.gd/8156207465.pdfIn PDF document text
    • http://pikawin.rf.gd/spatial_data_management.pdfIn PDF document text
    • https://s3.amazonaws.com/silubebebefuju/cakephp_3_email_attachment.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_off00011012.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11012 5520 bytes
SHA-256: 50495427ec046fbb39dd5e7e775982ab64af13b03c6640dc92f3e68424805099
font_01_sfnt_off000122eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x122EB 11272 bytes
SHA-256: 51d79e4ff23fd7cf4d5f703d40e2b89d00c39f3adafd0dfb975e8239a21e28ed

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