Malicious PDF — malware analysis report

Static analysis result for SHA-256 9873b3171bafbff7…

MALICIOUS

PDF

79.4 KB Created: 2021-05-11 14:02:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 684eadf94a61317506623c57c9f6582d SHA-1: d7690308752333f9a8d3724dd96945cc5223da54 SHA-256: 9873b3171bafbff73198929206fe4f91a1f50c364149d3ea0588f7874add27bd
126 Risk Score

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 0.9994

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/strik?utm_term=how+to+learn+php+easily PDF link annotation
    • http://pokovata.scienceontheweb.net/70773030939.pdfIn PDF document text
    • https://metoxuxiduwano.weebly.com/uploads/1/3/1/6/131636764/lesas.pdfIn PDF document text
    • https://wifovusu.weebly.com/uploads/1/3/4/3/134312249/78becf8d0d805.pdfIn PDF document text
    • http://niburufajanuto.sportsontheweb.net/apex_40_lcd_tv_model_ld4088.pdfIn PDF document text
    • https://cdn.sqhk.co/rizuwevize/dcjhyhh/commuter_bike_tyres.pdfIn PDF document text
    • https://cdn.sqhk.co/nekuripafi/yfjhSig/tom_cat_gold_run_game_download.pdfIn PDF document text
    • http://bikomowaxibujoj.medianewsonline.com/how_to_install_a_honeywell_thermostat_heat_only.pdfIn PDF document text
    • https://cdn.sqhk.co/zapiseniw/jFgvWOU/ziwixusedojibu.pdfIn PDF document text
    • https://cdn.sqhk.co/xoxujagemo/gJrjiQM/jisenetaboparovumiguriziw.pdfIn PDF document text
    • http://ravapusevuj.iblogger.org/sources_and_effects_of_air_pollution.pdfIn PDF document text
    • http://lixorajepidil.mygamesonline.org/what_is_the_setting_of_the_story_rikki-tikki-tavi.pdfIn PDF document text
    • https://wizitizisib.weebly.com/uploads/1/3/4/3/134361222/guvamobumoba_bugaxekafe.pdfIn PDF document text
    • http://rovanenafet.getenjoyment.net/jurnal_medan_listrik.pdfIn PDF document text
    • http://petajofap.22web.org/nixijiwodeduved.pdfIn PDF document text
    • http://laribij.scienceontheweb.net/comment_assembler_deux_en_un_seul.pdfIn PDF document text
    • https://mimuromujalu.weebly.com/uploads/1/3/0/7/130739347/lifunedun.pdfIn PDF document text
    • http://foripekomufotir.mypressonline.com/sipewolagepewosixus.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://lobadonuvupadux.rf.gd/gogubevifelufedo.pdfIn PDF document text
    • http://wefapifizipuja.rf.gd/theories_of_sociology_of_education.pdfIn PDF document text
    • http://zorijefugixor.atwebpages.com/factorising_algebraic_expressions_worksheet.pdfIn PDF document text
    • http://gejonutopufone.rf.gd/50567514887.pdfIn PDF document text
    • http://pepuzugalijiveb.rf.gd/aleph_paulo_coelho_synopsis.pdfIn PDF document text
    • http://mujigivufutufu.rf.gd/52836149042.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f8fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8FA 5064 bytes
SHA-256: 2ac39d1306920f8766ffacc13c02fc4efa664eba919e125565dcaa2bea50b627
font_01_sfnt_off00010a3a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A3A 11264 bytes
SHA-256: a7d47b277bc6fcf5797983b783a3cd1540bffc4cd5e4a46b710c74c58c42cbeb

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