Malicious PDF — malware analysis report

Static analysis result for SHA-256 e8c6e34a899679c6…

MALICIOUS

PDF

82.7 KB Created: 2021-02-19 10:49:49 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-30
MD5: 71807c53d7f2c8dc1e0f23577f0b04bb SHA-1: 9d93833b68352a8b8ad9d4a0362803975adf4c28 SHA-256: e8c6e34a899679c64ccbe3f831c099e0dc2cbf2dd6e708314a5a757e3f24de16
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to disposable domains and are likely part of a link farm designed to redirect users. The heuristic PDF_SEO_DISPOSABLE_LINK_FARM and the ML classifier strongly indicate malicious intent, specifically phishing or malware distribution. The presence of external URIs and the overall structure suggest the document is intended to lead the user to a malicious site.

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://baarspo.ru/wix?keyword=algonquin+middle+school+phone+number PDF link annotation
    • http://leomannapov.com/433310842453xt6x.pdfIn PDF document text
    • http://nelawetazabuta.66ghz.com/cpct_exam_full_form.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4463010/normal_5fee12ea0bb1c.pdfIn PDF document text
    • http://renosivegegev.iblogger.org/18268829529.pdfIn PDF document text
    • https://cdn.sqhk.co/kawiwitifa/hijahjF/depetowegidiferidenipefev.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4452834/normal_6000a8147123e.pdfIn PDF document text
    • http://sallehq.xyz/89733309343f8e3d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4402944/normal_5fd36a33cba08.pdfIn PDF document text
    • http://yewes.fun/puxuzansqa07.pdfIn PDF document text
    • https://cdn.sqhk.co/zogowefu/3hahgd9/furious_racing_3d_download_for_pc.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4476420/normal_5fced4c13c55d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4422906/normal_5fe742813735e.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/zagubip/delly_belly_full_movie.pdfIn PDF document text
    • http://xogetusutu.rf.gd/bebe_rexha_i_m_a_mess_mp4.pdfIn PDF document text
    • http://suvokejixu.epizy.com/nowavirikuwot.pdfIn PDF document text
    • http://fajegexowesidet.rf.gd/genetic_basis_of_inheritance_mcq_with_answer.pdfIn PDF document text
    • https://s3.amazonaws.com/golepe/cabaret_musical_soundtrack.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_off000107b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107B0 5532 bytes
SHA-256: 5409b706372d5c93bff7826cc3209390d0afe891c2a89bb84179895bdfdacb93
font_01_sfnt_off00011a4c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A4C 10428 bytes
SHA-256: 4d6786ee528eb7db6542fc2b1ae0ad679887acc9b31947a5afe6d5250068d992

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