Malicious PDF — malware analysis report

Static analysis result for SHA-256 fc81c70cd0e07005…

MALICIOUS

PDF

101.3 KB Created: 2021-05-07 08:41:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 49ab1252d2636903809dc7feabd847cc SHA-1: 1661491b77b7c5c3802d4a4487a36f12405512b1 SHA-256: fc81c70cd0e07005efc36c781968ade16c93faf36a221a301300207ad08facce
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=what+are+the+principles+of+instructional+supervision PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4414357/normal_60671fe0e1edc.pdfIn PDF document text
    • https://cdn.sqhk.co/joremeve/bfjRLIN/57909355080.pdfIn PDF document text
    • http://form-copyrightservices.com/wii_console_brand_newt24wp.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4409796/normal_6032183bd65b6.pdfIn PDF document text
    • http://tiktokhd.design/407339404120le5o.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4448346/normal_5ff291c968fe9.pdfIn PDF document text
    • https://cdn.sqhk.co/xamitarerivu/wTidIEg/97468877182.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4467612/normal_6056c98927b78.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4412591/normal_5fd1742e3b445.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://ec08fec6-e576-400d-8504-372613838d3c.filesusr.com/ugd/57e0ce_4aeec7c0fd2d4d87b68a99c72dbcf596.pdf?index=trueIn PDF document text
    • https://063758de-fb2f-4258-809e-b727485bfd5a.filesusr.com/ugd/89cda4_0da326cee03f49a783ffdf8b33ebcd92.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/09ea64e7-798a-4dd8-bd69-a903f330e9ad/76696174052.pdfIn PDF document text
    • https://c6f55193-7475-4343-97dd-33cb3b141b6a.filesusr.com/ugd/808d8c_f7123bd64cec4cb1bd64afa1108a8d8f.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/8b498388-f8a4-4915-a94a-d2d569481e50/ruzidabawegitikugirig.pdfIn PDF document text
    • https://cd8fad78-6a19-43c6-878c-830d169ee42d.filesusr.com/ugd/ff0d91_6ff00fc09d5041d69a78b6de74597e5e.pdf?index=trueIn PDF document text
    • https://dc58184e-bbba-402a-8e08-a55d552c8f3f.filesusr.com/ugd/0ebc1f_7d94874eb0884f0ea5ee706b2e99596a.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/bed487d1-c4fc-45b1-afe5-80198b30c2bb/what_animals_live_in_an_ecosystem.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4a7256ce-9d28-4df2-a02b-759ee1bfc58b/54908886359.pdfIn PDF document text
    • https://de99934f-f465-4d69-af5e-14f317c0a7c6.filesusr.com/ugd/4fea5c_483f553b0028458dbe904102b9563a14.pdf?index=trueIn PDF document text
    • https://cd70d4e5-4a1a-4071-96d1-f2415ea5ece1.filesusr.com/ugd/7f46b5_d805d3d5e2074ebab02807cb963d71af.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_off00015193.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15193 5176 bytes
SHA-256: fed113bab33bb7e593681aecd352ad771607323da061aa85bc268a1a76675905
font_01_sfnt_off0001633c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1633C 10780 bytes
SHA-256: 584ca1aa6f6cf5f15ddc44609fb37c3552b644d4a30a69972070802410925fb2

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