Malicious PDF — malware analysis report

Static analysis result for SHA-256 b3673e912d894b40…

MALICIOUS

PDF

84.3 KB Created: 2021-03-24 10:44:39 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 2455a61b32cad37a3acd55c4ca21d1d1 SHA-1: 933c955c42caf380d6e48278e4e4f35648eb81de SHA-256: b3673e912d894b40c4b0f20d5eda2803c60937e5fca37dd20caf84450c8c3010
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=account+assistant+resume+format+in+word PDF link annotation
    • https://bodonovovo.weebly.com/uploads/1/3/1/6/131607174/878067c66ae8074.pdfIn PDF document text
    • https://daxedinojadu.weebly.com/uploads/1/3/4/5/134590150/gexazebizexepi-lodavunudasulup-koxafulavufun-sigodosarosupez.pdfIn PDF document text
    • https://xajupodesuze.weebly.com/uploads/1/3/1/3/131380723/kovoxolufelafivo.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4463824/normal_5fd704b51562e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380084/normal_600a5c5349e34.pdfIn PDF document text
    • http://sevagawos.getenjoyment.net/66410389224.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4461746/normal_5ff54f8f0c64b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4428052/normal_604667a30bcb0.pdfIn PDF document text
    • http://gidujoluj.mypressonline.com/suvejudapu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4489247/normal_6015b9f3e3183.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4381735/normal_5fe4e7187d518.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4459477/normal_6003d162a12c2.pdfIn PDF document text
    • https://karaxofuko.weebly.com/uploads/1/3/5/3/135344752/6606559.pdfIn PDF document text
    • http://xenalebosob.scienceontheweb.net/10000_year_explosion.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://47c0d0ed-94e3-447f-940a-e265262d053f.filesusr.com/ugd/a43ec6_9e41a87180014c79b289f2b77e49f76f.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/7c8e09cb-5a18-441a-b529-9b8a563b88da/lukuxuwosikametojin.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/87fddaad-d9d4-4feb-be52-deb219b6ca72/30486839161.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e50d2022-0e9b-4551-b0a8-e7d0c031abcf/breaking_dawn_book_cover.pdfIn PDF document text
    • https://57ead060-d7b3-4f59-a803-6c9b47c0028a.filesusr.com/ugd/f30481_64bda43b492143cb92808ff8d28ba778.pdf?index=trueIn PDF document text
    • http://kopurelotalad.onlinewebshop.net/translation_reflection_rotation_dilation_worksheet.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3c975b58-739a-4af0-84dd-59ec663b1dd3/how_to_carve_animal_fur.pdfIn PDF document text
    • https://0e67983c-e844-40c9-b604-97311ec94efe.filesusr.com/ugd/6e13d9_1910948ec95b4f80bac213f0218eab1e.pdf?index=trueIn 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_off00010e26.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E26 5216 bytes
SHA-256: 02aea16e90b16b55411b78d15d0d8dfefdce8b02116231fa8f28f5b3b7dfda93
font_01_sfnt_off00011fe0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11FE0 10752 bytes
SHA-256: fda4b1499bbf55888bf3673fb8e7de1f7bf04ad7c1dc81eda25e0650d2b1d7c7

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