Malicious PDF — malware analysis report

Static analysis result for SHA-256 408537cb9afceba4…

MALICIOUS

PDF

99.0 KB Created: 2021-06-02 20:24:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: da510817ed446992b29c4e3eab0405eb SHA-1: 2a2ae17efd5530863defb617514552e1557ce276 SHA-256: 408537cb9afceba4bf41a3b338527e198b161d8bb72f1aee8dcdb3b0b7a5f4a1
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 0.9997

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://mezovuduw.ru/123?utm_term=bolt+cartoon+movie PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4453098/normal_602a79e0ecff4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4391000/normal_603d7f905ce91.pdfIn PDF document text
    • https://wigitofeza.weebly.com/uploads/1/3/2/6/132682623/5613426.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4475716/normal_5fdb0815850a0.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4416501/normal_5fcd539609885.pdfIn PDF document text
    • https://vowodilob.weebly.com/uploads/1/3/4/6/134697463/nuxalizutoro.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/faff6f98-549e-4f74-861f-a3ff667757b0/ritopideperiwowafejuvojor.pdfIn PDF document text
    • http://finatin.pbworks.com/f/22774641122.pdfIn PDF document text
    • http://pimepovume.pbworks.com/w/file/fetch/144480678/lomegolobofanuxerig.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ca00c9ae-7c58-4cb8-90e4-16a657834af9/cathy_caruth_trauma.pdfIn PDF document text
    • http://sizolasipape.pbworks.com/w/file/fetch/144422367/direct_and_indirect_expenses_meaning_in_hindi.pdfIn PDF document text
    • http://zikasamu.pbworks.com/f/lazigijesaluvulazebu.pdfIn PDF document text
    • http://xofitesu.pbworks.com/f/descargar_adobe_illustrator_cc_2019_gratis_softonic.pdfIn PDF document text
    • http://tisowowuduwe.pbworks.com/w/file/fetch/144426921/gta_vice_city_save_game_after_demolition_man.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_off0000d8ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8ED 36776 bytes
SHA-256: 1a719e6c5ccdf7102c851a87c2f5fc617b2b2fbdaf76f4f3aa13469491761088
font_01_sfnt_off00014976.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14976 4876 bytes
SHA-256: 4dfc5ee1d458a73a199d22cec378bdcb0f9fad4a2d48bd9f2f43ff6a1b6c20a3
font_02_sfnt_off000159fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x159FC 10824 bytes
SHA-256: 7e4f317f38bb726c466768aed1956972920fbbf0e7bfc22cbc64b17b18fcd7d0

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