Malicious PDF — malware analysis report

Static analysis result for SHA-256 ddf8a7d42dc08b58…

MALICIOUS

PDF

116.7 KB Created: 2021-04-07 11:08:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 1d9b71e53c17d600350f75aaafc0a412 SHA-1: cd49e89cd247a2a2fddc76ce0cbcc9b7499f2850 SHA-256: ddf8a7d42dc08b587bbba71053af5c075a2647f6f2c99ba4eda6f949df62c199
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, with one prominent URL pointing to 'nipisod.ru' and associated with a 'logo maker with crack' lure. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a large number of links on disposable hosting, suggesting a phishing or malware distribution scheme. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to redirect users to a malicious site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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://nipisod.ru/123?utm_term=aaa+logo+maker+with+crack PDF link annotation
    • https://kikitepolo.weebly.com/uploads/1/3/4/5/134514310/duron_paxinugus_birorev_valisezag.pdfIn PDF document text
    • https://sumozizadux.weebly.com/uploads/1/3/4/2/134266097/4271522.pdfIn PDF document text
    • https://vefonero.weebly.com/uploads/1/3/1/0/131070196/fizopozapi.pdfIn PDF document text
    • http://zitalogeloluwiw.mygamesonline.org/reading_passages_for_ielts_academic.pdfIn PDF document text
    • https://kesuvovim.weebly.com/uploads/1/3/5/3/135317554/5710657.pdfIn PDF document text
    • http://lewuvumo.sportsontheweb.net/fexufowosu.pdfIn PDF document text
    • http://liwurivosopap.medianewsonline.com/andhra_bhoomi_news_paper.pdfIn PDF document text
    • http://zizaburixakog.iblogger.org/does_papa_johns_have_whole_wheat_crust.pdfIn PDF document text
    • http://kelimap.mywebcommunity.org/ctet_solved_question_paper_last_5_years_download.pdfIn PDF document text
    • http://tujijamutibe.sportsontheweb.net/are_amana_dishwashers_good.pdfIn PDF document text
    • http://mirumumavetifun.mypressonline.com/webomajezazelixonimotoxu.pdfIn PDF document text
    • http://mazanaposiwos.iblogger.org/55840880179.pdfIn PDF document text
    • http://rulajamizap.getenjoyment.net/simple_present_continuous_tense_exercises_with_answers.pdfIn PDF document text
    • https://ligefupoluwoka.weebly.com/uploads/1/3/4/8/134888193/1127521.pdfIn PDF document text
    • http://narawodosure.medianewsonline.com/composite_materials_download.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://dubabin.rf.gd/gland_size_vs_cable_size.pdfIn PDF document text
    • http://zugepoguj.onlinewebshop.net/best_java_programming_books_2020.pdfIn PDF document text
    • http://wetedezowob.rf.gd/dagopipomofusufipabixa.pdfIn PDF document text
    • http://xakafof.rf.gd/best_guidebook_thailand.pdfIn PDF document text
    • https://s3.amazonaws.com/tolivajupeku/32737657305.pdfIn PDF document text
    • http://wapepot.rf.gd/15123227475.pdfIn PDF document text
    • http://newubopuga.epizy.com/31304179627.pdfIn PDF document text
    • https://s3.amazonaws.com/vabedafozo/latest_audit_report_of_infosys.pdfIn PDF document text
    • https://s3.amazonaws.com/kavugusepe/hssc_haryana_clerk_admit_card.pdfIn PDF document text
    • http://kilaminifil.epizy.com/ps_form_3600-ez_january_2020.pdfIn PDF document text
    • http://popeladidet.epizy.com/hospital_pharmacist_cv.pdfIn PDF document text
    • http://zalenunum.epizy.com/telc_b2_english_test.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000eeea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEEA 50724 bytes
SHA-256: b26e29b8daad15992d5f70ab2284f472a705e9c1be0fe9a739e7b01d50984284
font_01_sfnt_off00018abf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18ABF 5180 bytes
SHA-256: e0ff23505163c4498cdfc75afd0fd9a660b28c356f7582210ab85d7bc91eda2e
font_02_sfnt_off00019c46.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19C46 11912 bytes
SHA-256: c6bedf30c216f884a58c4ac09202112ec7772c9b3fab6020cfea1f311057424f