Malicious PDF — malware analysis report

Static analysis result for SHA-256 cd0fbaf7424a4f18…

MALICIOUS

PDF

93.4 KB Created: 2021-03-31 08:15:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 47547f5e9b5000a0e50a0877a63c1b49 SHA-1: 8a69959f575b1ea490dc9128796e551719f0a4a9 SHA-256: cd0fbaf7424a4f18e60ff19e5e59926df750165bd143666c24883de457ab8128
126 Risk Score

Malware Insights

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

The PDF contains numerous external URIs and is identified as a link farm hosted on disposable domains, suggesting a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly indicate malicious intent. The document body, though heavily obfuscated, contains references to 'wallpaper' and 'android hd', likely serving as a lure to encourage downloads from the embedded URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9967

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://resalured.ru/123?utm_term=world+best+wallpaper+for+android+hd
    • http://supportcopyright.net/getitududesemuzerxs9rb.pdf
    • https://static.s123-cdn-static.com/uploads/4426966/normal_60029dac4859a.pdf
    • http://suwadebizon.mywebcommunity.org/equations_of_linear_motion.pdf
    • http://vinnipoh.space/sun_joe_xtream_pressure_washer6tmbp.pdf
    • http://jixazepo.mywebcommunity.org/graphing_vertex_form_worksheet.pdf
    • https://bedexupef.weebly.com/uploads/1/3/0/7/130775630/922476.pdf
    • http://postel-na-zakaz.ru/how_to_calculate_cash_flow_to_total_debt_ratio2d60q.pdf
    • https://cdn.sqhk.co/janezewufaj/Yy4Pqjf/ayesha_jalal_the_struggle_for_pakistan.pdf
    • https://static.s123-cdn-static.com/uploads/4381997/normal_5ff3e1bd2e9cf.pdf
    • https://mufuxavezefajox.weebly.com/uploads/1/3/4/4/134497947/9c9e21d92d8871f.pdf
    • http://kemikavar.mypressonline.com/wemizafif.pdf
    • http://lnstagramoriginal.com/jodof6wpxz.pdf
    • http://baykamif.space/xadenegonirawzfe0h.pdf
    • https://static.s123-cdn-static.com/uploads/4425255/normal_600099f5bd1f8.pdf
    • https://filuloxi.weebly.com/uploads/1/3/2/7/132740414/wewimetilikug-gofalovavuga-ligoxavuso.pdf
    • https://temozune.weebly.com/uploads/1/3/0/7/130738928/20768224bfee1.pdf
    • https://cdn-cms.f-static.net/uploads/4407664/normal_605d77204c777.pdf
    • https://cdn-cms.f-static.net/uploads/4496014/normal_6044d1ef8b136.pdf
    • https://cdn.sqhk.co/rovujesox/z0Vheha/41620649870.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://fikelamizogu.myartsonline.com/37053085673.pdf
    • https://6b5d12f1-3bbc-48af-9ddb-5430d2fe15e7.filesusr.com/ugd/3bf302_85b335150b384e86ad16713842e83b20.pdf?index=true
    • http://nakarajibap.myartsonline.com/who_started_art_deco_movement.pdf
    • https://0dc5fd1c-b354-4e5b-9ccd-45395e8994ed.filesusr.com/ugd/f79e8d_30dc027e28934fb7af68d75331ba5956.pdf?index=true
    • https://765a5d72-5774-4a4d-a421-5c90307110ba.filesusr.com/ugd/f2a868_41f74fba54fb477cadda10207344a632.pdf?index=true
    • https://c3e810f9-371e-40b9-9a0b-4695a496ec77.filesusr.com/ugd/2c7c49_2a0c8f1b4ce34a10aae9b0b2c022a4ef.pdf?index=true
    • https://0a37a3d5-a0bf-4e77-8ff5-6127fd08aefa.filesusr.com/ugd/6046c9_a9454e6a9727400496389f5f34c98b62.pdf?index=true
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00012e42.bin
c6dc69f24c12adf83f3dd0c9e6d2fd13cdaad933a5b606ff8e5626fdb8ca2b86		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12E42 5376 bytes
font_01_sfnt_off00014091.bin
f717eca61789a2fe96024b7960772b122956e48df6fd6a8ada4e83b759f1d339		 pdf-font-stream PDF embedded font (sfnt) at offset 0x14091 11600 bytes

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