Malicious PDF — malware analysis report

Static analysis result for SHA-256 43ec88dfa17fdc5f…

MALICIOUS

PDF

79.4 KB Created: 2021-03-16 06:16:15 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: fbf4c960f3eda985c0ba2d1e11a474ba SHA-1: bdd59976d7247d9aa0719725cf3abe9de226209b SHA-256: 43ec88dfa17fdc5fb8d28a6c2f7d050c3f53cf66d2168bff4086e6a3d9281751
184 Risk Score

Malware Insights

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

The PDF contains multiple embedded links that are flagged as malicious redirectors, indicating an attempt to lead the user to harmful websites. The ML classifier and ClamAV detection strongly support the malicious nature of this file. While no scripts were explicitly extracted, the PDF structure and embedded links suggest 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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://crophysi.ru/award?keyword=commentaire+compos%25C3%25A9+les+caprices+de+marianne+pdf In PDF document text
    • http://chatik85939775.fun/full_time_uber_driver_salary_houstonifuja.pdfIn PDF document text
    • https://cdn.sqhk.co/kiribikiv/gc6hbPb/livovowisu.pdfIn PDF document text
    • http://vomimaforotagi.mywebcommunity.org/mekijimojegokotevugapek.pdfIn PDF document text
    • http://kijofizovurisos.medianewsonline.com/sizeja.pdfIn PDF document text
    • http://badge-verification-center.com/17227998169jshzb.pdfIn PDF document text
    • http://fortuneocredit.com/conda_install_setuptools_ubuntuqirsl.pdfIn PDF document text
    • http://pogadai.xyz/2012_dodge_avenger_2.4_thermostatjzi1k.pdfIn PDF document text
    • http://xatovapotogu.mywebcommunity.org/joindre_plusieurs_en_ligne.pdfIn PDF document text
    • https://cdn.sqhk.co/ranemagesoga/ggjcU3y/extreme_car_driving_2015.pdfIn PDF document text
    • https://cdn.sqhk.co/zomitokemip/Qjcjijd/cach_cai_mod_ben_10_trong_minecraft_pe.pdfIn PDF document text
    • https://cdn.sqhk.co/surodamiz/hk6hemy/fazusoxuwa.pdfIn PDF document text
    • https://cdn.sqhk.co/wemerofada/jcjgCKz/94636992635.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://serefelotu.epizy.com/christian_devotional_audio_songs_free.pdfIn PDF document text
    • https://s3.amazonaws.com/libeganot/guide_synonyms_and_antonyms.pdfIn PDF document text
    • http://talaxevavilur.rf.gd/lettering_templates_for_applique.pdfIn PDF document text
    • http://jerolap.rf.gd/ae_systems_by_dometic_awning_parts_canada.pdfIn PDF document text
    • https://s3.amazonaws.com/xakusineba/1607762641.pdfIn PDF document text
    • http://relogevavikidid.epizy.com/70346445863.pdfIn PDF document text
    • http://judejelalub.rf.gd/skip_counting_worksheets_grade_3.pdfIn PDF document text
    • https://s3.amazonaws.com/jadudusujuje/bebevakusamorawanakawo.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_off0000f623.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF623 5348 bytes
SHA-256: c8a107b07fcaaa72de62640aae97d6d722ce6e05c810c6bb6bd92d4be452cb3b
font_01_sfnt_off000107ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107EA 11952 bytes
SHA-256: 279cedc7c18fbdefa88ff8bd49d61c7cb83c6c5dd9399502320d1fb31545c577

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