Malicious PDF — malware analysis report

Static analysis result for SHA-256 bd4c9511eb8f00af…

MALICIOUS

PDF

99.4 KB Created: 2021-05-04 03:43:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-10
MD5: 13f1a976933018a7c05c320116a44c4e SHA-1: f0009a47fe3c1fd8d2ca97d9753246d5a59d2cf8 SHA-256: bd4c9511eb8f00affb8c220b61d2178be93938664016150cef048dd04db554f0
126 Risk Score

Malware Insights

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

The sample is a PDF file flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier as malicious. It contains numerous embedded URLs, many pointing to disposable domains, and uses a lure related to 'The Yearling' chapter 20 summary. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic indicates a link farm on disposable hosting, suggesting a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://ponafet.ru/strik?utm_term=the+yearling+chapter+20+summary PDF link annotation
    • http://rozogididibusar.sportsontheweb.net/basics_of_electrical_and_electronic_engineering.pdfIn PDF document text
    • http://poposiruta.mywebcommunity.org/97791939167.pdfIn PDF document text
    • http://xasumemazekejo.scienceontheweb.net/reading_fluency_chart_printable.pdfIn PDF document text
    • http://fejekadiwoxobiz.getenjoyment.net/al_arabiyyah_bayna_yadayk_book_1_download.pdfIn PDF document text
    • https://lajogaful.weebly.com/uploads/1/3/4/4/134481829/sonobilomazo_tusoruruvik.pdfIn PDF document text
    • http://gufurebu.medianewsonline.com/44862936115.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://a4edf7fa-b057-49b5-8014-e5fd436fbef3.filesusr.com/ugd/c8b2c5_3889c95240a048b18f96640d71bf19ad.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/8c8a18fd-342a-4d8e-ab92-01fbf84bd2a4/27248172052.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/178809ed-154d-412d-ba52-681e2c72ce64/can_popcorn_tins_be_recycled.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/40d66c47-f153-4131-83e1-93a2ce925e4e/what_is_agile_development_model.pdfIn PDF document text
    • https://s3.amazonaws.com/puretulenuza/alex_rider_movie_series.pdfIn PDF document text
    • https://s3.amazonaws.com/jinabisura/47361044922.pdfIn PDF document text
    • https://8271b8e8-1520-4b18-8785-2fafc8cd33e6.filesusr.com/ugd/efc97f_8d9bf9dfb1264a3bb89f44fe7c07eb32.pdf?index=trueIn PDF document text
    • http://saluwagasa.onlinewebshop.net/political_psychology_journal.pdfIn PDF document text
    • https://b84c3727-5d5a-4c5d-9d5d-21cac87b3a69.filesusr.com/ugd/fdd6c2_1e44ce1ffd4d4d44b3bd3ed912a1e729.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/wiwuxot/words_containing_greek_root_geo.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_off000146ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x146EC 5672 bytes
SHA-256: d6bd3db7ea226bf549e0169942a73122e1e01e77280255591cfc3c367013c8c0
font_01_sfnt_off00015a1b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15A1B 10944 bytes
SHA-256: 0799427b880702bbe6287a5c1afb907bdbc90f0b24f8750db27559ebdec7ca2b

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