Malicious PDF — malware analysis report

Static analysis result for SHA-256 f21d4c4862bd34c5…

MALICIOUS

PDF

83.3 KB Created: 2021-04-20 17:31:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: d3e45b43c65a05b97424b4652b14d759 SHA-1: b6c37e0f5e757bb3c119dd392a438c48a32e6922 SHA-256: f21d4c4862bd34c5bed0bfef27238a8cf4bd84e15fb3ea2e1f1a3507c036076c
126 Risk Score

Malware Insights

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

The file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojanized PDF. It contains numerous embedded URLs, many of which point to disposable hosting or link farms, suggesting a phishing lure. Although no scripts were explicitly extracted, the PDF structure and heuristic firings strongly suggest it's designed to redirect users to malicious websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://bologen.ru/strik?utm_term=mass+flow+rate+formula+unit PDF link annotation
    • http://bikelumonekodex.mygamesonline.org/proceso_de_la_investigacion_cientifica_raul_rojas_soriano.pdfIn PDF document text
    • https://cdn.sqhk.co/jeporikate/gijfpVI/adamantine_pathfinder_spell.pdfIn PDF document text
    • https://cdn.sqhk.co/kuzosexiwugu/gjhhchf/human_race_drop_today.pdfIn PDF document text
    • https://cdn.sqhk.co/daposofoxig/n4fibgg/best_item_build_for_sun_mobile_legend_2019.pdfIn PDF document text
    • https://cdn.sqhk.co/rujiwujik/Wgdohc0/star_wars_rebels_characters_in_real_life.pdfIn PDF document text
    • https://cdn.sqhk.co/mumeriretepi/cwifih8/woperutodogolotorafikuxu.pdfIn PDF document text
    • http://vizojuzoninunoz.scienceontheweb.net/cost_accounting_multiple_choice_questions_and_answers.pdfIn PDF document text
    • http://fakoxipedobuk.22web.org/54575839038.pdfIn PDF document text
    • http://sezituza.66ghz.com/verb_to_have_simple_present_negative_form.pdfIn PDF document text
    • http://zitugaxusi.mygamesonline.org/galileo_galilei_bertolt_brecht_gratis.pdfIn PDF document text
    • https://cdn.sqhk.co/sojuzafu/ieLjejc/pimesovawatuliba.pdfIn PDF document text
    • https://cdn.sqhk.co/rojozedofaf/iY4jiig/praise_and_worship_songs_2018_with_lyrics.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/garorowa/ariane_5_user_s_manual.pdfIn PDF document text
    • https://s3.amazonaws.com/purufiz/zigevix.pdfIn PDF document text
    • http://papetamunamu.epizy.com/what_is_the_salary_of_information_technology_in_india.pdfIn PDF document text
    • http://dupivet.epizy.com/why_do_molecular_compounds_have_lower_melting_points_than_ionic.pdfIn PDF document text
    • http://puwegobatove.epizy.com/pupadaxita.pdfIn PDF document text
    • http://webibufirug.rf.gd/zakukotuzavizepetopijas.pdfIn PDF document text
    • http://gedonisezif.epizy.com/lvmh_annual_report_2011.pdfIn PDF document text
    • http://kejufomamikis.epizy.com/excellence_punta_cana_room_categories.pdfIn PDF document text
    • https://s3.amazonaws.com/nimuwet/fpsrussia_meme_template.pdfIn PDF document text
    • http://dogiperij.epizy.com/filmora_tutorial_free_download.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000eec8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEC8 5008 bytes
SHA-256: d9d2f46496ea78a295730affbceb8a68a57e1da1ac3ba62d0b41ad76ab177ad0
font_01_sfnt_off0000ffd8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFD8 12536 bytes
SHA-256: c0344b748660af07d2d0bd21945ca09596ecb70d9dcd6ae3d73d603fcc91fac5
font_02_sfnt_off00012a44.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A44 16252 bytes
SHA-256: 4d926866a27d3f4a13aae02fb0c392be30c53fcc208a90e3c19d2016c99eb1e3

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