Malicious PDF — malware analysis report

Static analysis result for SHA-256 4b4554913c4839c8…

MALICIOUS

PDF

81.1 KB Created: 2021-03-10 20:09:28 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-20
MD5: 050b9aa8f6ff8d5a02d54a9334048b12 SHA-1: f53b68e7a839de28f005c5cc817ad821aa519681 SHA-256: 4b4554913c4839c8e31c1fb6224df20c0323d0b27d06f646f543812cffefa9d6
184 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs pointing to potentially malicious or disposable domains, as indicated by the PDF_MALICIOUS_REDIRECTOR_LINK and PDF_SEO_DISPOSABLE_LINK_FARM heuristics. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution via these links. No scripts were extracted, but the document structure itself is designed to facilitate redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://yafferge.ru/123?utm_term=pinch+of+nom+pdf++free In PDF document text
    • http://padodalowitit.iblogger.org/nemadiv.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4409095/normal_601cab2431656.pdfIn PDF document text
    • http://bugosegu.scienceontheweb.net/26064104320.pdfIn PDF document text
    • http://magabof.22web.org/how_many_calories_are_in_a_wendys_chocolate_frosty.pdfIn PDF document text
    • http://wisatemubudu.medianewsonline.com/nikon_dx_afs_nikkor_18-55mm.pdfIn PDF document text
    • http://on-arenas.com/faninevekolalticfj.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4466379/normal_6011140ee13b0.pdfIn PDF document text
    • http://cmbespaceclient.xyz/how_to_do_an_internal_audit_of_companycbnwf.pdfIn PDF document text
    • http://siteznakomstv69.space/best_material_for_gmat_preparation8hyem.pdfIn PDF document text
    • http://jedilinosur.mywebcommunity.org/fikavevumoxexor.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4459654/normal_6047c184c8202.pdfIn PDF document text
    • http://juwupexutaval.mywebcommunity.org/triangles_3_exterior_angles_worksheet_answer_key.pdfIn PDF document text
    • http://pivolirarorip.mypressonline.com/15400828462.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/zamemigojat/borland_c_5._02_free_64_bit.pdfIn PDF document text
    • http://vigexosav.myartsonline.com/45921871473.pdfIn PDF document text
    • http://rixuroruwe.myartsonline.com/asean_economic_community_blueprint_2020.pdfIn PDF document text
    • http://tuvatopuvonu.epizy.com/40386230908.pdfIn PDF document text
    • http://vavijirodujozi.rf.gd/tch_file_sang_nh.pdfIn PDF document text
    • http://wurebosuloxu.myartsonline.com/barnes_and_noble_job_application.pdfIn PDF document text
    • https://s3.amazonaws.com/xeroguru/horus_heresy_book_59.pdfIn PDF document text
    • http://kadoxosin.atwebpages.com/cours_javascript_ajax.pdfIn PDF document text
    • https://s3.amazonaws.com/jazofi/gmat_quant_cheat_sheet.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_off0001008b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1008B 4976 bytes
SHA-256: b7e04afa8d0031ff8bbecdde05502c3bbbdd6c9036bb01c98517716701e3b967
font_01_sfnt_off00011155.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11155 11200 bytes
SHA-256: 29bbaefdc41222dd2a1f68549bf9700be3b3828d33c3d528290ea97524cd5598

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