Malicious PDF — malware analysis report

Static analysis result for SHA-256 390d35a0c4b5147c…

MALICIOUS

PDF

68.4 KB Created: 2021-03-17 09:47:19 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: b5213c2a70661789f342e1b6fed4247f SHA-1: 57855188b7875bd73927af534fc208f2924b4bbd SHA-256: 390d35a0c4b5147c2a5f5fe70b74c990a105b5e044d1e48eacd1ba2066650ed8
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF file was flagged as malicious by ClamAV and an ML classifier. It contains a high number of embedded URIs, many pointing to disposable hosting, suggesting a link farm or phishing lure. The presence of external URIs and the 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic indicate an attempt to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://vilenefex.ru/123?utm_term=darling+songs++telugu+wap.+net PDF link annotation
    • http://blancop.xyz/jocko_willink_discipline_equals_freedom_field_manual_audiobookw97kx.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4485695/normal_603c1d486ddf3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4499309/normal_6041c082c4cf6.pdfIn PDF document text
    • http://lavkavkusa.store/05_jeep_grand_cherokee_intermittent_no_start7vkm5.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4383138/normal_60025cd1e62e7.pdfIn PDF document text
    • http://sayseedokg.com/japan_f1_tv_coverage_australiagw1tz.pdfIn PDF document text
    • https://fukagopesuzidad.weebly.com/uploads/1/3/1/3/131381553/mikoji_jakezut.pdfIn PDF document text
    • http://legendnat.space/druid_shapeshift_5e_guidele943.pdfIn PDF document text
    • https://lujukote.weebly.com/uploads/1/3/2/7/132712447/79bd5.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/e9975aa0-ac5f-4fa0-a330-b10b96b7c679/45695829582.pdfIn PDF document text
    • https://s3.amazonaws.com/metubevozisul/57114465582.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c485ddf0-bbbd-4ab5-847f-7613b1b5f481/samsung_un60fh6003f_price.pdfIn PDF document text
    • https://s3.amazonaws.com/jijumupade/gixekunis.pdfIn PDF document text
    • https://e437b920-fa79-41d5-b67c-0ca059f4e77a.filesusr.com/ugd/d97c10_e995ef28cc6a448db0c182bf98d4ccde.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/goveruduzewoxu/47891518130.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8fd1af33-2238-4a63-9ea0-07eaba35073e/12150557789.pdfIn PDF document text
    • https://s3.amazonaws.com/makumapikeze/mizigavovojixorepofepuk.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/44e04640-cf19-48bf-b9ee-08497102523a/47225140561.pdfIn PDF document text
    • https://ac3db616-04cb-40f1-8357-c67041f5e20c.filesusr.com/ugd/eda9ba_bb344678ed1c41e3a2acf50a439b2498.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_off0000cbf4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCBF4 5112 bytes
SHA-256: 2b94366858181135aaac5051a00b66f5fc17e4f81fb610340f29da26978f8745
font_01_sfnt_off0000dd88.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD88 11040 bytes
SHA-256: 9fb02df3d416b4ee38139e451021ebaa3bfa73cf0c66b4cc0871cad00a23e740

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