Malicious PDF — malware analysis report

Static analysis result for SHA-256 b7e0e9e214e6f5de…

MALICIOUS

PDF

78.0 KB Created: 2021-04-02 19:02:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-13
MD5: 2e1a7cf1353a5dd8ab795511676214c2 SHA-1: f8eaae45bed0148c598cd4436c8404464b79c0e4 SHA-256: b7e0e9e214e6f5dea01f2fd999d5927cfcab59b425f6a41fbdbb3a4c469d42e7
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many hosted on disposable domains, indicating a link farm or SEO poisoning attempt. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and numerous external URLs point towards an attempt to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • 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 contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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://xezojetit.ru/123?utm_term=short+essay+format+template PDF link annotation
    • http://tokio-2020.fun/wosomop93f81.pdfIn PDF document text
    • http://wumewil.sportsontheweb.net/vizio_e320vl_remote_app.pdfIn PDF document text
    • https://cdn.sqhk.co/xororofomed/fjcitG4/gopurewisematetak.pdfIn PDF document text
    • http://damita.fun/69347103561ltysw.pdfIn PDF document text
    • https://cdn.sqhk.co/rijatazuga/dNXHZhi/11020706178.pdfIn PDF document text
    • http://bivaxosufuxibo.mygamesonline.org/basic_electronics_projects.pdfIn PDF document text
    • http://nibajafij.medianewsonline.com/pf_withdrawal_form_10c.pdfIn PDF document text
    • http://tuvosudokalidu.scienceontheweb.net/siliponugisit.pdfIn PDF document text
    • https://cdn.sqhk.co/vozaxodep/ghjicQb/24507153062.pdfIn PDF document text
    • https://cdn.sqhk.co/puvubuzu/jaShdJS/tafl_board_game_instructions.pdfIn PDF document text
    • https://cdn.sqhk.co/nuduniguwufo/dgiyjdk/cast_away_full_movie_mp4.pdfIn PDF document text
    • https://cdn.sqhk.co/zanotunuzi/VhhpjdQ/5455224845.pdfIn PDF document text
    • https://cdn.sqhk.co/rujamuzizogo/hbhhZid/rewiwuranujuvuvozoguxemo.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/d32ff9fc-3bdf-4889-8525-19ac2030d913/jetubuxaxibudifu.pdfIn PDF document text
    • https://5a6df620-610b-4d6f-8f1b-71e936bb70bc.filesusr.com/ugd/1f5cef_c840a398d04343d8a4ddd2272904e581.pdf?index=trueIn PDF document text
    • https://156bb51f-0b62-477f-88ca-8620af00812b.filesusr.com/ugd/e3ff21_87407d1c5a944c39912f7fe819302685.pdf?index=trueIn PDF document text
    • https://c4cd0dbc-23d7-4f11-b65f-2561cec8abe5.filesusr.com/ugd/516793_6e8a8c617c93486b81bf97e18338ceee.pdf?index=trueIn PDF document text
    • https://391e4f24-9fc9-4707-ac06-338edcd9f959.filesusr.com/ugd/110ef3_4406f2ea073742eda98f9c03b0898be3.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/2ec0e33d-da28-4068-9bfd-530eb82348de/que_es_inteligencia_emocional_en_el_trabajo.pdfIn PDF document text
    • http://limoxukuk.atwebpages.com/34855438365.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_off0000f1be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1BE 5344 bytes
SHA-256: 78ce04d10d35544b246b9fc4abfdf6a6b25b260f1a928d0393a45cbf20bf0b63
font_01_sfnt_off000103ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103CA 11032 bytes
SHA-256: 1416fe400a0d1a4684231c1bcdbeb324a2f7689fe4ad40ec780d179efa926ede

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