Malicious PDF — malware analysis report

Static analysis result for SHA-256 bfeae0cee97fb6d6…

MALICIOUS

PDF

67.7 KB Created: 2021-03-14 04:56:47 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: 260e1ab1a86016d80a3525642a9d3b3c SHA-1: 61bbfd08380cdc4d7fd461d3da0fbcc2990b52b5 SHA-256: bfeae0cee97fb6d6d9bd081c5e944330301f278eee19814fdc271e181dea9fdd
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, with one specifically pointing to a suspicious domain ('kuzutuzo.ru') that is likely used for phishing or malware distribution. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were directly extracted, the PDF structure and embedded links suggest an attempt to redirect users to malicious content, aligning with spearphishing tactics.

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
  • 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://kuzutuzo.ru/wix?keyword=tusd+aeries+portal PDF link annotation
    • http://nizavevorupuj.mywebcommunity.org/jane_eyre_article.pdfIn PDF document text
    • https://begazasageb.weebly.com/uploads/1/3/1/6/131637419/nunelurarenizuw.pdfIn PDF document text
    • http://xariketixagat.mypressonline.com/funai_zv427fx4_combination_recorder.pdfIn PDF document text
    • https://xexidizufom.weebly.com/uploads/1/3/4/5/134508107/givuvitevipub.pdfIn PDF document text
    • http://xenalebosob.scienceontheweb.net/ganoderma_mushroom_cultivation.pdfIn PDF document text
    • http://lewijufe.sportsontheweb.net/modo_de_produccion_feudal_ejemplos.pdfIn PDF document text
    • http://zutatowatipo.mywebcommunity.org/34849767207.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/dojivewobasuval/22877964361.pdfIn PDF document text
    • http://fapiruligifujo.epizy.com/disney_world_schedule_december_2019.pdfIn PDF document text
    • https://s3.amazonaws.com/wexoteluwag/indian_birds_pictures_with_names_and_information.pdfIn PDF document text
    • http://gixarewujedel.atwebpages.com/equus_play_plot_summary.pdfIn PDF document text
    • http://solejow.myartsonline.com/lipasawatunugukidu.pdfIn PDF document text
    • http://keregimuw.onlinewebshop.net/pidanet.pdfIn PDF document text
    • https://s3.amazonaws.com/sinadi/zitavedowufun.pdfIn PDF document text
    • http://zivuneko.epizy.com/never_going_back_again_sheet_music.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_off0000ccfc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCCFC 4904 bytes
SHA-256: 9bde11766bcacd31a132a44ac0c764768de8ffccbdf42e5e22b08215fa7606da
font_01_sfnt_off0000ddb2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDB2 10284 bytes
SHA-256: 73c675d8b53b2784e91747dbb9acb26a30c2a238641180be8405149fde709f9b

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