Malicious PDF — malware analysis report

Static analysis result for SHA-256 46ec4f7016bf1384…

MALICIOUS

PDF

73.0 KB Created: 2021-03-17 19:29:15 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-10
MD5: 61ebfd0ec71ce1b42af2ad3c1c57563e SHA-1: 63024a9781bc5f809f61262905cb148b7dc01227 SHA-256: 46ec4f7016bf13841e23b37045b978bd58d2ae0feb26da472b42f9086fd40c6f
126 Risk Score

Malware Insights

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

The ML classifier and ClamAV detection strongly indicate maliciousness. The PDF contains numerous embedded URLs, many pointing to disposable domains, suggesting a phishing or link-farming operation. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' specifically highlights this behavior, indicating the PDF is a non-clustered link farm on disposable hosting.

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://xajibur.ru/wix?keyword=magnetism+worksheet+pdf PDF link annotation
    • http://doniposebuk.iblogger.org/nedagu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450516/normal_6033519cc99a1.pdfIn PDF document text
    • http://scm03.ru/tunidomanupazosuvujenunx4bdf.pdfIn PDF document text
    • http://naturfresh.space/aashto_lrfd_2012va204.pdfIn PDF document text
    • http://robugipunebib.mygamesonline.org/how_to_enter_group_code_pokemon_go.pdfIn PDF document text
    • http://wutugavefezaza.22web.org/allah_ke_bande_song_mr_jatt.pdfIn PDF document text
    • http://get3creditscores.info/how_to_wash_a_dyson_dc17_filter2hwh4.pdfIn PDF document text
    • http://kopogaxepaku.sportsontheweb.net/hp_deskjet_plus_4120_not_connecting_to_wifi.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4416929/normal_600a83633f8ed.pdfIn PDF document text
    • http://rixujewo.getenjoyment.net/akuntansi_keuangan_menengah_dwi_martani.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/fixararololu/linear_inequalities_in_2_variables_worksheet.pdfIn PDF document text
    • http://mopawok.epizy.com/bosch_exxcel_washer_dryer_manual_f17.pdfIn PDF document text
    • https://88211235-bf86-4d40-a6ec-a052db2f682e.filesusr.com/ugd/94e5ef_72d0b39ea40a4e13b6c7f96ff6d38480.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/nerugiraxura/dusulowifowibi.pdfIn PDF document text
    • http://pezedavepajizum.rf.gd/77208978483.pdfIn PDF document text
    • https://ee42ee57-4547-4a8c-8a66-6cccb7f6869d.filesusr.com/ugd/2a9ad2_01b2295b6980427e81a74518c2bc06b1.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/ropidadegaxut/26412559862.pdfIn PDF document text
    • http://talizojewebovob.rf.gd/aashto_pavement_design.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_off0000e11a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE11A 5584 bytes
SHA-256: f2a63759fab98576b6afc9263b3e08ddca71b8fec79897a70dbb1e0bccfe186b
font_01_sfnt_off0000f415.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF415 10344 bytes
SHA-256: fb70a2de1e044681bc89d1b8960de0021997bca6bc9deceb8d57838bd23921fc