Malicious PDF — malware analysis report

Static analysis result for SHA-256 f3364c2991223c10…

MALICIOUS

PDF

80.3 KB Created: 2021-04-14 23:05:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: f8e345e3ca60a24eacf19940a9cf2c7d SHA-1: 10a60fc47c53a5a7860ccbda5523cc93da111b80 SHA-256: f3364c2991223c100dffb6cedd8bd564c583620086cc865e5b892712cb99d67f
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 0.9994

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://baarspo.ru/strik?utm_term=doce+pasos+y+doce+tradiciones+aa+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4489241/normal_602116dc647a2.pdfIn PDF document text
    • https://fupuvoriru.weebly.com/uploads/1/3/4/4/134494751/ddd73f2c.pdfIn PDF document text
    • http://mezurova.22web.org/rural_sociology_in_telugu.pdfIn PDF document text
    • http://axecheat5.xyz/9526569782js04f.pdfIn PDF document text
    • https://subilitukufune.weebly.com/uploads/1/3/4/6/134629352/3c45e4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413469/normal_606c22af1ef2b.pdfIn PDF document text
    • https://vapulorefemefiz.weebly.com/uploads/1/3/5/9/135956910/sebidejolupugupo.pdfIn PDF document text
    • http://sushibara.net/93221845103uugvc.pdfIn PDF document text
    • http://ripuvajuze.iblogger.org/pakeveb.pdfIn PDF document text
    • https://sadewurepoko.weebly.com/uploads/1/3/0/7/130776460/4ce92a4a71a61.pdfIn PDF document text
    • http://itslm.fun/download_counter_strike_1.6_apks9929.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4473916/normal_60325bec4fa3a.pdfIn PDF document text
    • https://ziralupaw.weebly.com/uploads/1/3/1/3/131379221/wumose.pdfIn PDF document text
    • http://flowerport.market/supodemonus0cwou.pdfIn PDF document text
    • http://otshelnik.net/the_magician_tarot_card_astrology2s8if.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4402707/normal_60531af968a20.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374372/normal_6041f00d6d8ca.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/2d12c025-174e-482b-88c7-e720b1f9d889/simbolos_del_diagrama_de_flujo_de_proceso.pdfIn PDF document text
    • http://dizoran.epizy.com/handbook_of_ecological_economics.pdfIn PDF document text
    • http://jakiwokokik.epizy.com/kipipopu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0540b1d5-b0f9-4821-b647-89eda41cfb74/how_to_reset_a_symbol_scanner.pdfIn PDF document text
    • http://kijakina.epizy.com/descargar_biblia_de_estudio_reina_valera_1960_gratis.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/308b72c8-8d25-4243-a7d7-8453643d695b/how_much_is_my_new_home_sewing_machine_worth.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_off0000f83d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF83D 5220 bytes
SHA-256: cbb747f6592189ad0dda11905a846a4fd3e3021c623b4687e4958191283cc249
font_01_sfnt_off00010a1b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A1B 12336 bytes
SHA-256: a6bc99f8d3ac2f2102c969188f6e1180e65e37a01b908fa7573641c89de2e919

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