Malicious PDF — malware analysis report

Static analysis result for SHA-256 5e73de845abdc150…

MALICIOUS

PDF

77.5 KB Created: 2021-03-05 04:15:07 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: fa3102a99a423beab22910b69dbaa047 SHA-1: b32f1d142b2bd35a7544515e0bff58f99035399e SHA-256: 5e73de845abdc150f6c03601659a37e23d5fbd19a5cf47b7dc8aae6d2a9150a4
126 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics, including a critical ClamAV detection for 'Pdf.Phishing.Trojan'. It contains numerous embedded URLs, many of which point to disposable hosting and are part of a link farm, suggesting a phishing or malware distribution attempt. The ML classifier also strongly indicated maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://maypoin.ru/wix?keyword=toy+story+3+worksheet PDF link annotation
    • http://pibalefiw.22web.org/cursos_de_ingles_basico_para_principiantes.pdfIn PDF document text
    • http://revilokepudidu.mygamesonline.org/39805796240.pdfIn PDF document text
    • http://xuwuvewisin.mypressonline.com/planet_fitness_pf_black_card_worth_it.pdfIn PDF document text
    • https://zunexoxefa.weebly.com/uploads/1/3/5/3/135340588/bajiruzukumino.pdfIn PDF document text
    • http://majikok.mygamesonline.org/educational_psychology_masters_degree_new_york.pdfIn PDF document text
    • https://guzozexuvuro.weebly.com/uploads/1/3/4/3/134322735/javazajiven.pdfIn PDF document text
    • https://supagerafigi.weebly.com/uploads/1/3/0/8/130874211/8261ebf30a7427.pdfIn PDF document text
    • https://zevebijupaxize.weebly.com/uploads/1/3/4/7/134754497/3749823.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://vusukunuvedigup.epizy.com/allen_bradley_plc_programming_manual.pdfIn PDF document text
    • http://molagegivijoxu.onlinewebshop.net/theory_u_book.pdfIn PDF document text
    • http://fonovituten.rf.gd/buxoferimavigekodolitoti.pdfIn PDF document text
    • http://kuwijiti.myartsonline.com/how_to_hide_caller_id_on_your_phone.pdfIn PDF document text
    • https://s3.amazonaws.com/mesotodimus/50344165345.pdfIn PDF document text
    • http://xetorofowuwid.epizy.com/88337164141.pdfIn PDF document text
    • http://mixonanax.epizy.com/81083382687.pdfIn PDF document text
    • http://minofadejewezup.rf.gd/lofadozip.pdfIn PDF document text
    • https://s3.amazonaws.com/nisiwanolom/cloudera_developer_training_for_apache_hadoop.pdfIn PDF document text
    • https://s3.amazonaws.com/zetubakuz/briggs_and_stratton_spare_parts_manual.pdfIn PDF document text
    • http://vakizonozajaxe.onlinewebshop.net/nimumoketozegotabar.pdfIn PDF document text
    • https://s3.amazonaws.com/patotale/brahmachari_movie_songs.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_off0000eea5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEA5 4900 bytes
SHA-256: 64da0b5eee95b68f964abe7fe1a92a16915e29674958d6355aacca805ab31fc5
font_01_sfnt_off0000ff6a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF6A 13220 bytes
SHA-256: d69681a1f26c226f13d1c245783a6d4afcd44ec9371639f343211bf3bf11d96d

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