Malicious PDF — malware analysis report

Static analysis result for SHA-256 ef0041ef7e70620f…

MALICIOUS

PDF

76.6 KB Created: 2021-05-10 02:50:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: 0be5a51d3864b44dc0570744f76ad9e3 SHA-1: efd09e22a285f45ff64f18216ed48372800157ff SHA-256: ef0041ef7e70620f48b244893048f2ac91c2aabc3a442f63a14a020d3e68394f
126 Risk Score

Malware Insights

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

The PDF document contains embedded URLs and is flagged by multiple heuristics, including ClamAV and an ML classifier, as malicious. The document body, though heavily obfuscated, appears to be a lure related to resetting a Kenwood radio, likely intended to trick users into clicking the malicious links. The presence of numerous links to disposable hosting and link farms suggests a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://xezojetit.ru/strik?utm_term=how+do+i+reset+the+bluetooth+on+my+kenwood+radio PDF link annotation
    • https://cdn.sqhk.co/sepagumal/cfje2Uq/basic_digital_marketing_terms.pdfIn PDF document text
    • https://cdn.sqhk.co/rukugewul/hihVZTL/potise.pdfIn PDF document text
    • https://cdn.sqhk.co/dopuzodopuvu/jisjdGh/speed_boat_tours_mekong_delta.pdfIn PDF document text
    • https://cdn.sqhk.co/kunutewiwit/hjegicX/duwam.pdfIn PDF document text
    • http://bulakirip.getenjoyment.net/description_of_a_stormy_sea.pdfIn PDF document text
    • http://tilikef.mygamesonline.org/rational_fasting_book.pdfIn PDF document text
    • https://cdn.sqhk.co/widiroje/eghuieI/rimivikitoruwa.pdfIn PDF document text
    • http://palogaza.sportsontheweb.net/in_season_basketball_weight_training_program.pdfIn PDF document text
    • http://alexandreablog.com/58983869048evnnx.pdfIn PDF document text
    • https://cdn.sqhk.co/dukosisevu/4OibhgI/noteter.pdfIn PDF document text
    • https://cdn.sqhk.co/delojiwuguj/8FsdzaA/fun_christmas_word_search.pdfIn PDF document text
    • http://lipexifinidoda.scienceontheweb.net/importance_of_teaching_critical_thinking_skills_in_the_classroom.pdfIn PDF document text
    • http://maturibcgj.space/super_mario_odyssey_bonus_travelers_guide6ikmu.pdfIn PDF document text
    • https://cdn.sqhk.co/kasavakujosi/4hijjhj/.pdfIn PDF document text
    • http://nipokaxa.getenjoyment.net/dunurununotoxu.pdfIn PDF document text
    • https://cdn.sqhk.co/zadexona/eeljIig/76465448681.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://vakizonozajaxe.onlinewebshop.net/40220108471.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6234b037-8ec3-45ca-ae89-34b427eb2e4e/tibijivopokekegukakaso.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f6732f77-5cdb-4085-98b9-17b36deb2fc6/algorithmic_trading_course_singapore.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6ab4dd10-f82c-4e04-9119-bf06cee1367d/duvexunuvegadilamimo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5ad906bf-c35b-441d-9cea-8a5216817c0f/fosepatap.pdfIn PDF document text
    • http://temodorofeg.atwebpages.com/describing_people_s_appearance_english_exercises.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ef45b249-24da-42c7-a9a6-1d5110123638/lokumilogigepedopom.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_off0000ed4d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED4D 5424 bytes
SHA-256: e00c3d295cd044accc1a786911a33963bfe802a241cf5949e5ed4a8db24faa51
font_01_sfnt_off0000ff9c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF9C 10832 bytes
SHA-256: 4eda7ca7a78ff47b53369727e5d9c44e82a4c66586f384e26522e9779db1c2c3

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