Malicious PDF — malware analysis report

Static analysis result for SHA-256 cb21d60a45d6d935…

MALICIOUS

PDF

69.4 KB Created: 2021-04-06 20:42:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 06873432e580e268b94d73c27f21da9c SHA-1: 1f9ee318063d5a3c49aeade380f133735ac1fd36 SHA-256: cb21d60a45d6d935fc9346a0b33e45e050023ce4d8ef362ee9c2367bfbdb3085
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 0.9996

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://lozipotod.ru/award?keyword=action+research+arm+test+pdf PDF link annotation
    • http://rumurel.mywebcommunity.org/40202387395.pdfIn PDF document text
    • http://durebemidiges.getenjoyment.net/biodiesel_from_microalgae_beats_bioethanol.pdfIn PDF document text
    • https://cdn.sqhk.co/vudupapuj/hhjaicK/41518899128.pdfIn PDF document text
    • https://vuvonuzomuvi.weebly.com/uploads/1/3/4/5/134508102/padobo.pdfIn PDF document text
    • https://gofolepoxi.weebly.com/uploads/1/3/4/8/134882907/9685311.pdfIn PDF document text
    • http://nuloriwilorij.scienceontheweb.net/65466072333.pdfIn PDF document text
    • https://pepedojimu.weebly.com/uploads/1/3/1/0/131069997/jijobusesafo.pdfIn PDF document text
    • http://zegobudipaju.mywebcommunity.org/13519662345.pdfIn PDF document text
    • https://cdn.sqhk.co/goremujoz/aGjbhgJ/gifapev.pdfIn PDF document text
    • https://nuxutesinof.weebly.com/uploads/1/3/1/4/131437012/gapigonajad-lusegezijamumab.pdfIn PDF document text
    • http://witikotuxigere.scienceontheweb.net/marvel_films_in_order_of_story_2020.pdfIn PDF document text
    • https://cdn.sqhk.co/dafisuwikib/Abhiczw/96396912196.pdfIn PDF document text
    • https://vizijupazikek.weebly.com/uploads/1/3/2/8/132814338/6deff8eb.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://samajusinifako.atwebpages.com/traduction_anglais_franais_gratuit.pdfIn PDF document text
    • https://s3.amazonaws.com/xutomoxu/buy_laminate_sheets_online.pdfIn PDF document text
    • https://s3.amazonaws.com/lewuli/balance_sheet_assets_order_of_liquidity.pdfIn PDF document text
    • https://b0c090b1-cb02-46d8-8a69-3fb9d82636b6.filesusr.com/ugd/4dbf3f_de587242a6dd4cf0b8694d6b07486a09.pdf?index=trueIn PDF document text
    • https://2e4d99de-9d37-4ce2-abd5-0bbccafdbe51.filesusr.com/ugd/33a2e4_89311940e7c449789a95c9cd29a6fbc3.pdf?index=trueIn PDF document text
    • https://311919ef-92bb-434b-a93e-382c1a5e2e65.filesusr.com/ugd/c893b4_58e2219b2a1b4edfbc67b1e74a4a9d72.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/wibedubosateg/string._format_lua_table.pdfIn PDF document text
    • http://zizenatoxu.myartsonline.com/ramuji.pdfIn PDF document text
    • http://danebusuji.onlinewebshop.net/gulobolotulodutakigas.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_off0000d3eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD3EB 5352 bytes
SHA-256: b3506339c69736d0a4d14dfa3e6c877960153c6a404e347ac53fa9c6bba033da
font_01_sfnt_off0000e5f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5F8 10044 bytes
SHA-256: 9e110a12935220a082230dd5d0d6f18cb4be6ef631fed4460d642a997dd0c78a

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