Malicious PDF — malware analysis report

Static analysis result for SHA-256 a132aff3c9d56182…

MALICIOUS

PDF

82.5 KB Created: 2021-03-22 06:29:12 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 24f930779e13ad01d0aaca06a4e3d7e0 SHA-1: 7454913ee74b2542d38856e429238d817db6bede SHA-256: a132aff3c9d56182043fb7e399fac588ddca79c3d3c5db820c8cf548c03e32da
126 Risk Score

Malware Insights

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

The ML classifier and ClamAV detection strongly indicate maliciousness. The PDF contains numerous external URIs, including one pointing to 'jacksth.ru', suggesting a phishing or malware distribution attempt. The document body, though heavily obfuscated, appears to be a lure related to 'Safety in microbiology laboratory pdf'. No scripts were extracted, but the presence of multiple external links and the high confidence score point to a malicious document, likely delivered as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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://jacksth.ru/award?keyword=safety+in+microbiology+laboratory+pdf
    • http://rcasino.info/what_are_the_powers_of_the_house_of_representatives_and_senatew1ido.pdf
    • http://gasurorir.sportsontheweb.net/fetujakonelupijan.pdf
    • https://static.s123-cdn-static.com/uploads/4379221/normal_5ffcac691abd2.pdf
    • https://cdn-cms.f-static.net/uploads/4405950/normal_603113736c375.pdf
    • https://static.s123-cdn-static.com/uploads/4494677/normal_5ff9da07bc189.pdf
    • https://cdn-cms.f-static.net/uploads/4379720/normal_6018bd97c2a8b.pdf
    • http://investmag.org/facebook_messenger_for_pc_windows_10vzsdd.pdf
    • https://cdn-cms.f-static.net/uploads/4466391/normal_5fe895316b769.pdf
    • https://cdn-cms.f-static.net/uploads/4471082/normal_602d0db372928.pdf
    • https://cdn-cms.f-static.net/uploads/4480895/normal_5fdb2c4ec83a4.pdf
    • http://ch-bewertung-2888.xyz/robinixuleewsu2.pdf
    • https://cdn-cms.f-static.net/uploads/4407069/normal_6021c35f520e4.pdf
    • http://mokaxizekebade.scienceontheweb.net/jemovuzimipexabidowipapak.pdf
    • http://xuxetosufuzo.getenjoyment.net/listado_de_verbos_irregulares_en_ingles_con_traduccion_al_espaol.pdf
    • http://youtube-subscribes.com/how_to_use_a_safe_can_openerhvtxe.pdf
    • https://static.s123-cdn-static.com/uploads/4416136/normal_5ffe64495f354.pdf
    • http://venira.su/zadedebeygvm.pdf
    • http://nazorizuz.medianewsonline.com/3466099057.pdf
    • https://static.s123-cdn-static.com/uploads/4464539/normal_5ffab08590a03.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/resixexi/96278390589.pdf
    • https://uploads.strikinglycdn.com/files/a2476f27-df34-4bcf-a705-240543f4e8ef/12068456958.pdf
    • http://kopurelotalad.onlinewebshop.net/new_testament_bible_trivia_with_answers.pdf
    • https://uploads.strikinglycdn.com/files/4e700069-dbb4-4996-aa3e-5eae0d01eb21/disep.pdf
    • https://s3.amazonaws.com/fewifuwu/97559240916.pdf
    • https://uploads.strikinglycdn.com/files/8e99aaf1-0b21-42ed-b51d-fcdbfbde6976/10775698697.pdf
    • https://s3.amazonaws.com/vexosafugunu/club_car_golf_cart_accessories_ebay.pdf
    • https://s3.amazonaws.com/dusined/guitar_sheet_music_christmas_songs_free.pdf
    • https://uploads.strikinglycdn.com/files/f17659f2-89fa-4ada-b6da-8de33e7c85c2/36798804363.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010417.bin
f666e840242d59304212723e1b496bc0645ad20db45d9ce1a79032134cfc1b32		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10417 5640 bytes
font_01_sfnt_off00011739.bin
c3ae0d3c914ca1539e78524188052fe566ebf66ac717908bf6c6734dbd027544		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11739 10772 bytes

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