Malicious PDF — malware analysis report

Static analysis result for SHA-256 872ec2393700d7a1…

MALICIOUS

PDF

79.9 KB Created: 2021-03-18 12:56:00 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 55c1cbf54f4d4594bdc96cbe77647e21 SHA-1: b012103b29bb28c0e50b0a7118aebf7d5deb599d SHA-256: 872ec2393700d7a1f0d87eaf92f10418c3329752e319ec270c8e53c8c2e18d76
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://nipisod.ru/123?utm_term=archero+mod+apk+android+republic PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4366014/normal_5fc86f4975779.pdfIn PDF document text
    • https://cdn.sqhk.co/pejozujemu/47ijDu5/helix_hyper_ball_target.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4374963/normal_5fc98ace882e6.pdfIn PDF document text
    • https://cdn.sqhk.co/letarezetap/CtjdgtM/fast_money_halftime_report_cnbc_fix.pdfIn PDF document text
    • https://cdn.sqhk.co/zenekukera/gh7THyX/real_baseball_3d_mod_apk_download.pdfIn PDF document text
    • https://cdn.sqhk.co/gusisitixinu/hjibbvd/logo_quiz_game_online_free.pdfIn PDF document text
    • http://rovapiseve.22web.org/90654122275.pdfIn PDF document text
    • https://cdn.sqhk.co/kubabulukod/fhtKRia/assistant_manager_resume_objective.pdfIn PDF document text
    • http://gutibefatidag.medianewsonline.com/43586571963.pdfIn PDF document text
    • http://fabunek.iblogger.org/boxelegonabuxezumasifetit.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://xenezipulugiji.atwebpages.com/wordly_wise_3000_book_5_lesson_2_test.pdfIn PDF document text
    • http://senorumela.epizy.com/24411724890.pdfIn PDF document text
    • https://s3.amazonaws.com/wavunot/37154081013.pdfIn PDF document text
    • https://s3.amazonaws.com/lovetijif/46644579354.pdfIn PDF document text
    • http://pawepeg.atwebpages.com/cazadores_de_sombras_ciudad_de_hueso_pelicula_completa_subtitulada.pdfIn PDF document text
    • https://s3.amazonaws.com/pusixa/bomolumejejuleri.pdfIn PDF document text
    • https://s3.amazonaws.com/mejawiwomak/53958825718.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e3a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3A3 6052 bytes
SHA-256: ca07d24cffde9d6b0c4d76b52d7e1f43301bfde892b915cfa093c3acd077697d
font_01_sfnt_off0000f891.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF891 5328 bytes
SHA-256: 32947067cfe70d7760536005949f9f6660b0495187b00ef6146fa7a009685cd8
font_02_sfnt_off00010a7d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A7D 12256 bytes
SHA-256: 2b868be65c2f78f851143391be57cfe7ed2ecbf9a1eba881f2b47619ab85b722

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