Malicious PDF — malware analysis report

Static analysis result for SHA-256 0840bbc4bd4fd00d…

MALICIOUS

PDF

80.2 KB Created: 2021-04-11 17:50:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 3037c117105f1b27087c40246c35bbb5 SHA-1: d16b6a9581cd7fded3a5fcede65175e447e3adee SHA-256: 0840bbc4bd4fd00d38489dd184b23065ce41c4bde36550f9218dc3d58d592062
126 Risk Score

Malware Insights

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

The PDF contains numerous external links, many hosted on disposable domains, suggesting a link farm or phishing lure. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware delivery. Although no scripts were explicitly extracted, the PDF structure and numerous URLs point towards a malicious document designed to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://kuzutuzo.ru/strik?utm_term=what+are+the+4+general+types+of+media
    • http://tihefers.online/all_the_world_s_countries_flags2ofm7.pdf
    • http://kengoru.space/canon_eos_750d_manualches0.pdf
    • http://suvolupijiro.mygamesonline.org/fobomajesilikukuraleleki.pdf
    • http://gezakiribonenin.mywebcommunity.org/lejinizekimotexewipapap.pdf
    • http://bovinuxunegobi.iblogger.org/american_psychological_association_style_guide.pdf
    • http://rokuboxajiga.medianewsonline.com/xesanurigiletajuralo.pdf
    • http://guwejusu.22web.org/pidaganozepunu.pdf
    • http://tuzojexis.mypressonline.com/7691915964.pdf
    • http://kevifiregerufug.scienceontheweb.net/wokezejidekij.pdf
    • http://kogowetek.getenjoyment.net/os_quatro_temperamentos_humanos.pdf
    • http://stonersfranchise.com/risk_analysis_methods_journalwyvdx.pdf
    • http://bemigovoso.iblogger.org/job_application_letter_format_cbse_11.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://bapaxofobawob.rf.gd/eclipse_twilight_music_list.pdf
    • https://efa91360-7c21-416c-9d60-3189e0beb381.filesusr.com/ugd/42ffc7_bab5739ed50b4d5cb1118c8e233a45a2.pdf?index=true
    • http://rifufogasuser.rf.gd/58479892923.pdf
    • https://uploads.strikinglycdn.com/files/687cf2ff-f50e-4db5-b273-52cc04c01801/find_sound_driver_for_my_pc.pdf
    • http://fovawipemezipu.myartsonline.com/envisioning_information_download.pdf
    • http://fuvuvadut.onlinewebshop.net/lasixurobunujubudimofogo.pdf
    • https://cb38ef3f-1f2c-4622-8962-dca261660167.filesusr.com/ugd/3ae201_3ee0268d5c804c82810b69de4506e0f3.pdf?index=true
    • https://uploads.strikinglycdn.com/files/2613fb4f-1a8f-478f-af2f-36b9403b91f4/how_to_write_a_critically_appraised_paper.pdf
    • https://uploads.strikinglycdn.com/files/a85f748c-bd91-4f4e-8ba8-245ca93e1b7a/fovosajaluwivod.pdf
    • https://2172aa7b-56d6-4bcb-a12f-aafeda7c7725.filesusr.com/ugd/0d9129_a67035971054465db0d75fb00e84a0dd.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_off0000f897.bin
3db7d3a91bd7ef5b481e806e6bea5fa4623b381b9bfe9c55950c003cff749dbc		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF897 5660 bytes
font_01_sfnt_off00010bcb.bin
5b4e84bbb9b2a9a65134655410c3ac8c997dba874a85063e5f53be05d1a242df		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10BCB 11816 bytes

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