Malicious PDF — malware analysis report

Static analysis result for SHA-256 d14df614386bc873…

MALICIOUS

PDF

81.6 KB Created: 2021-02-27 15:15:49 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 6128935e2fc62a205e7575e071836484 SHA-1: d431121f23130ad983fe3c52a17c716829d574a7 SHA-256: d14df614386bc87360e29d2780361d0ed462eacdb63aea919a72b98345caaf88
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains numerous external URLs, many hosted on disposable domains, suggesting a link farm designed to redirect users to malicious content. The presence of embedded URLs and the overall structure point towards an attempt to exploit users through deceptive content, likely leading to a second-stage download or credential harvesting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://jumiwimov.ru/123?utm_term=school+psychology+case+study+examples PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4389074/normal_5fd78a918e79c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4428069/normal_601869202f766.pdfIn PDF document text
    • https://lekudelido.weebly.com/uploads/1/3/1/3/131378953/topozatexijalonuzipe.pdfIn PDF document text
    • http://kixurox.getenjoyment.net/best_ukulele_videos_for_beginners.pdfIn PDF document text
    • https://cdn.sqhk.co/zojixemem/riabj2R/23297763111.pdfIn PDF document text
    • https://cdn.sqhk.co/remokuvupen/Wthhihc/only_one_airpod_at_a_time_works.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368972/normal_5fd72325616bf.pdfIn PDF document text
    • https://zefisazivite.weebly.com/uploads/1/3/5/3/135314851/8072598.pdfIn PDF document text
    • https://cdn.sqhk.co/kixalixu/ThichaQ/koziduwolo.pdfIn PDF document text
    • http://vowufijetapiko.sportsontheweb.net/how_to_write_a_good_synopsis_for_a_literary_agent.pdfIn PDF document text
    • http://kuxakedu.iblogger.org/ct_dmv_test_questions_and_answers_2019.pdfIn PDF document text
    • https://cdn.sqhk.co/busumodofu/djcuxhg/kapiwe.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4486743/normal_6039f9166dfdb.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://tunowik.epizy.com/50909593060.pdfIn PDF document text
    • http://wudemexa.myartsonline.com/dewubexoxawokenuxedefuk.pdfIn PDF document text
    • https://s3.amazonaws.com/mokamoba/refomavosixe.pdfIn PDF document text
    • https://s3.amazonaws.com/widetunipet/mogopekosameteloxad.pdfIn PDF document text
    • https://s3.amazonaws.com/penale/arteritis_temporal_tratamiento.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f567.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF567 5392 bytes
SHA-256: 66b8c4e5b4a7db4a37175acea7792c89fd5b6cf81d68a7eeee484edf9eaf6722
font_01_sfnt_off000107cb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107CB 10240 bytes
SHA-256: 7ace87aa0d5165da5a9a7547fa9c9dc49e83ec80b93eb9f61944bdcbd08647b8
font_02_sfnt_off00012ae5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12AE5 4324 bytes
SHA-256: b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c

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