Malicious PDF — malware analysis report

Static analysis result for SHA-256 4569548a50b5dfad…

MALICIOUS

PDF

78.1 KB Created: 2021-03-15 00:48:09 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 0b935a3c98e4bdc3ae7c30355e8f1e56 SHA-1: 8a6c196ebbf48492d60b107967133d781e8b2057 SHA-256: 4569548a50b5dfad5b98b6b23641ec547cd1331a3c5769b37fb69d2bba74e075
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

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 6

  • 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 contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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/123?utm_term=forms+of+data+analysis+in+qualitative+research PDF link annotation
    • http://nejuwenazi.iblogger.org/kiran_news_agency_alp_answer_key.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4411918/normal_60433e53553a2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4488572/normal_5fd292c848b05.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4473963/normal_5ff0ddfd8d9f0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4460228/normal_5fd8b449e0b09.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4449422/normal_603f548d226d3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4475997/normal_601ac493387b7.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4367311/normal_5fece7f838636.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4479433/normal_6018688875819.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4452376/normal_600190b84e626.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://5071cc05-3fa2-46b1-b944-d2523ca4b51d.filesusr.com/ugd/62e2c1_f29adff3255c40399415bb34b2f0f0dc.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/wujafivabipo/89457939879.pdfIn PDF document text
    • http://wekolaxoretewov.epizy.com/picture_of_a_template_strand.pdfIn PDF document text
    • https://s3.amazonaws.com/fopalew/71288709987.pdfIn PDF document text
    • https://s3.amazonaws.com/dosipive/43371016547.pdfIn PDF document text
    • https://s3.amazonaws.com/loxopudizus/brunswick_marine_in_emea_center.pdfIn PDF document text
    • https://s3.amazonaws.com/nijosinizo/62363206232.pdfIn PDF document text
    • https://1a6defe7-92a0-4357-8a70-d3bce85d30c9.filesusr.com/ugd/385065_5e1f1dc839424b57aa6188b7167b53c9.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/vatosolikijike/coupled_mode_theory_for_plasmonic_waveguides.pdfIn PDF document text
    • https://7292b199-6d7c-4e84-b646-7854114497ba.filesusr.com/ugd/53361e_b35b90a1f3554840a6bd9c0d4f71d6c3.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_off0000f17e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF17E 5504 bytes
SHA-256: 1e4367e11d12b2c87ca669ab355817dce7a0ee3e0891b482f1203c4f7a1e5e76
font_01_sfnt_off00010415.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10415 11432 bytes
SHA-256: 6cde3c0ade35284a0505ced0d69580e605cca7c0da43b4f35abaa381d11f3e54

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