Malicious PDF — malware analysis report

Static analysis result for SHA-256 42a489b020f3a1ca…

MALICIOUS

PDF

76.0 KB Created: 2021-02-24 11:44:09 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: ad4167ec7945e98e73c7607b12a523e7 SHA-1: 7a54394953b96c455b9db080c9a9c34ea70884c5 SHA-256: 42a489b020f3a1cabbb5aa74ea0f62b197df749873822cea4dcb145aa11d95c8
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://seumenha.ru/strik?utm_term=the+complete+works+of+swami+vivekananda+pdf+free+download PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4367944/normal_600e2565e8d86.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4476010/normal_6027670458f70.pdfIn PDF document text
    • https://sixagezox.weebly.com/uploads/1/3/1/6/131606695/zuvugejawepot-mupumozesapa.pdfIn PDF document text
    • https://cdn.sqhk.co/definuseju/hmNieMv/arctic_wolf_287bh_reviews.pdfIn PDF document text
    • https://cdn.sqhk.co/razonavari/jjbhdoU/mega_ice_blast_marlboro.pdfIn PDF document text
    • https://xetofevona.weebly.com/uploads/1/3/1/3/131379012/1301904.pdfIn PDF document text
    • https://cdn.sqhk.co/modonasuje/sjeLQhe/18191575765.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4486763/normal_601d66cd42dd7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4471099/normal_6027efdfb7a16.pdfIn PDF document text
    • https://cdn.sqhk.co/xagogudexo/geppbjb/raxesowokevupulom.pdfIn PDF document text
    • https://domisupufiz.weebly.com/uploads/1/3/5/3/135316273/320450.pdfIn PDF document text
    • https://cdn.sqhk.co/purorenutuw/ehdargc/eagles_greatest_hits_full_album_download.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4496597/normal_5fc7b93d9977a.pdfIn PDF document text
    • http://vosaret.iblogger.org/92648269375.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://veduredetud.epizy.com/61648649045.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d25e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD25E 5560 bytes
SHA-256: e4a15f94416dfa286d2edc81effdf361482622d3709cb0192bf4e9adc2e86cfc
font_01_sfnt_off0000e533.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE533 10944 bytes
SHA-256: 796ce2ef30b29fce114cda5f38dbbfcbf9a2af416607517d79ff66adfed5ef5a
font_02_sfnt_off00010ac6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10AC6 16172 bytes
SHA-256: b6a6ca5d1ececf9b8f85cf34f243a5152d852bd6c46ff1fd844468d100e5349c

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