Malicious PDF — malware analysis report

Static analysis result for SHA-256 21283eefe6929c53…

MALICIOUS

PDF

74.4 KB Created: 2021-02-14 04:50:41 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 984f686d5466345443f0772a811ea108 SHA-1: d720b38c2a36b3360d0f71c3a25a44b5faa8b2f2 SHA-256: 21283eefe6929c5369937f78de325fab1cf404c9a21251e2f830a8e1dfa2aacb
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 0.9998

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://jottigo.ru/123?utm_term=monitoring+progress+and+modeling+with+mathematics PDF link annotation
    • http://nasolanamisajo.iblogger.org/representation_letter_template.pdfIn PDF document text
    • http://sreda.city/20029392088r7esd.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4380890/normal_5ff96cc80db59.pdfIn PDF document text
    • https://begobaxu.weebly.com/uploads/1/3/5/3/135336669/dunagojawanix_pososajuvibaf_vovebis_difigofepi.pdfIn PDF document text
    • http://didanak.22web.org/clash_royale_apk_link.pdfIn PDF document text
    • http://espacecmb.xyz/mozelirotaponokuzufed9lyub.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4373505/normal_5ff6ad2c5276e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4391000/normal_600dc8822615f.pdfIn PDF document text
    • http://kenijukawog.22web.org/botanist_ffxiv_guide.pdfIn PDF document text
    • https://cdn.sqhk.co/demexadol/RtjiibI/52800484000.pdfIn PDF document text
    • http://glawerry.online/jefuwipipabusizobakn7cff.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4483864/normal_6020753217126.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://sawokemapixaf.epizy.com/convert_to_dwg_autocad_2013.pdfIn PDF document text
    • http://nedajazamofo.epizy.com/brothers_full_hd_movie_foumovies.pdfIn PDF document text
    • http://notavopanugatog.epizy.com/galaxy_buds_manual_reset.pdfIn PDF document text
    • http://fepoxojosatomu.epizy.com/romanesque_church_architecture.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_off0000e356.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE356 5584 bytes
SHA-256: cdd94ce3d0bded6f9c35c0c7c2c2ada7f541f51644f74d1d9913bfdff6f0d177
font_01_sfnt_off0000f64a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF64A 11180 bytes
SHA-256: 04a28a45c27a810704dcb8bcf6e0de536bfb0213d6e8413920815512387ffff0

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