Malicious PDF — malware analysis report

Static analysis result for SHA-256 87e16143541a6bbb…

MALICIOUS

PDF

73.2 KB Created: 2021-03-29 15:24:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: 7157b0eeb13f97feb46e8d3af2986f21 SHA-1: 517f4ea05350bd5dc3e0357c0190e26e93286432 SHA-256: 87e16143541a6bbb0dd4eab38a6ca572e6f6af12efb0decd9942a43c8462eeea
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

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://leonvi.ru/strik?utm_term=cuanto+es+1+metro+80+cm+en+pies PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4368246/normal_600e4615e61dd.pdfIn PDF document text
    • https://cdn.sqhk.co/bizujutenifo/c8yhj9P/puxin.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366973/normal_6023b7e33d97f.pdfIn PDF document text
    • http://jotewelife.iblogger.org/fasoru.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413119/normal_605d7cd42f309.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417221/normal_5fdc71d5ad9d1.pdfIn PDF document text
    • http://fabujisaw.mygamesonline.org/kunavowixutavomexokodo.pdfIn PDF document text
    • http://zitukuzagipu.iblogger.org/decode_base64_c.pdfIn PDF document text
    • http://jepisafidezegun.scienceontheweb.net/american_gods_cast_mr_nancy.pdfIn PDF document text
    • https://cdn.sqhk.co/fonixoligem/ibQiaSJ/fluid_live_wallpaper_iphone_se_2020.pdfIn PDF document text
    • http://xojuxelase.medianewsonline.com/ancient_dracolich_5e_stats.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://377d1c6c-8747-407e-9a0d-bb8234813250.filesusr.com/ugd/f0b1fd_4a006080718545938ec6d42475c41768.pdf?index=trueIn PDF document text
    • https://e1d5fa5a-667c-4d22-bb72-2ec96b4ed0f7.filesusr.com/ugd/01f30d_fc923b21fed44bd197e41bc9867452c8.pdf?index=trueIn PDF document text
    • http://givesal.rf.gd/65637532734.pdfIn PDF document text
    • http://ritebononopa.epizy.com/xegutonol.pdfIn PDF document text
    • http://rizukapusapanom.rf.gd/junuwukedajadu.pdfIn PDF document text
    • https://2e4d99de-9d37-4ce2-abd5-0bbccafdbe51.filesusr.com/ugd/33a2e4_578c6fd2c13a424a8a8040ef34286c2c.pdf?index=trueIn PDF document text
    • http://retatek.epizy.com/zemurimame.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_off0000df13.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF13 5340 bytes
SHA-256: 815505e9c9e725c24a84e85d261b0559f185c2e6a5b6df821715e695340831e5
font_01_sfnt_off0000f127.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF127 11232 bytes
SHA-256: 7aba33230ffbf3953317fd1f1e5253f8fcff79b8c25ef350b9b21183331089a7

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