Malicious PDF — malware analysis report

Static analysis result for SHA-256 53a5f8082521607c…

MALICIOUS

PDF

76.6 KB Created: 2021-03-27 23:18:13 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: ab09394963e53b04d15a67f6860cb5af SHA-1: 5322d2b2d8eeb6fe5ca334fa426d1d6a34c47008 SHA-256: 53a5f8082521607c215f4fd5ad2b12359bfc80c38c38acd1163bf9238ebb8365
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 0.9999

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://soxebez.ru/wix?keyword=asus+aimesh+ax6100+review PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4389080/normal_6025e8324ed72.pdfIn PDF document text
    • http://tideparipawovu.mygamesonline.org/rectangular_waveguide_nptel.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4389085/normal_60163701ce54c.pdfIn PDF document text
    • http://tamogulaganero.scienceontheweb.net/descriptive_case_study_definition.pdfIn PDF document text
    • http://xovebud.mygamesonline.org/ielts_speaking_topic_list.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4406216/normal_5ffff49c2ed85.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4368762/normal_5fdf28ee78cdc.pdfIn PDF document text
    • http://nikibolerobika.getenjoyment.net/around_the_world_in_80_days_book.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365649/normal_6033c356c93eb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4473410/normal_6010f3185b0cf.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4412413/normal_6049e0b69f3a2.pdfIn PDF document text
    • http://lotto-investclub.com/skyrim_special_edition_tips_for_beginners3nsso.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4457011/normal_5fc5b594510aa.pdfIn PDF document text
    • http://agencymedia-ig.com/xarotuwudezugd71cf.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4373527/normal_5fef05078578e.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://gemovimuwopete.atwebpages.com/introduction_to_computer_system_class_11.pdfIn PDF document text
    • http://gujimosodaza.myartsonline.com/biblia_reina_valera_1960_para_celular.pdfIn PDF document text
    • http://zeteximezoxa.myartsonline.com/niluzanim.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_off0000ed21.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED21 5448 bytes
SHA-256: cfe37736875c07b167cd71c3dc72e852de6c0d5ca911be1b31fe1fc2ba7baa37
font_01_sfnt_off0000ff9c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF9C 10684 bytes
SHA-256: 17ef118999b7bb17e05a51f4b9b30c28b080abb7716d9c34ae8914abd5856c4d