Malicious PDF — malware analysis report

Static analysis result for SHA-256 7f9a5bc6a1b13101…

MALICIOUS

PDF

81.4 KB Created: 2021-03-23 00:43:06 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: ff70665826d1ad10a2c1b157e10e3e31 SHA-1: 39960b545b73f66e778554df41bd7a3d202253cc SHA-256: 7f9a5bc6a1b131019eb3f811c02209f07d99c060e383ac19271cc72c3fa43e82
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://baarspo.ru/123?utm_term=college+gradebook+excel+template PDF link annotation
    • https://cdn.sqhk.co/sojowidaz/etieieu/zumebuwasidaxokipanavoz.pdfIn PDF document text
    • http://sunufosabupes.scienceontheweb.net/series_and_parallel_circuits_basics_worksheet_answers.pdfIn PDF document text
    • http://localdesign.me/30131081367mona7.pdfIn PDF document text
    • http://tehnikator.ru/jawefuevcjm.pdfIn PDF document text
    • https://wupanotowi.weebly.com/uploads/1/3/1/4/131406855/kofezawus_mikad_debowuwerojije_mimoju.pdfIn PDF document text
    • https://ligunoko.weebly.com/uploads/1/3/4/3/134308404/244883.pdfIn PDF document text
    • https://cdn.sqhk.co/disegivoji/jhciget/93534907303.pdfIn PDF document text
    • https://liwotagavujid.weebly.com/uploads/1/3/5/9/135961529/339a21909de1.pdfIn PDF document text
    • https://cdn.sqhk.co/kisunika/agchgjj/popowobejetegewusum.pdfIn PDF document text
    • https://cdn.sqhk.co/vivepovugeli/1gf7ic1/dudaregabijepibevi.pdfIn PDF document text
    • http://maska-respirator.shop/28079302972zs536.pdfIn PDF document text
    • https://xozoravupot.weebly.com/uploads/1/3/4/3/134314106/167211.pdfIn PDF document text
    • http://tanivikovome.sportsontheweb.net/lazigu.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://ketabigumowun.atwebpages.com/36678039065.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f3757443-62b2-4ef1-948d-4400fd47f0b9/kulenokedifu.pdfIn PDF document text
    • https://e29f0852-aa8c-4fc4-a5db-fcd144ab7086.filesusr.com/ugd/b730be_2b8c327f16424a0fb3ea339ec5d09ea7.pdf?index=trueIn PDF document text
    • https://a5fc3680-5c08-4cda-bd6c-abaa3bdf25bc.filesusr.com/ugd/ea5d7b_8dc96e6b5c2b437c9be719ef71686a42.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/4874c927-b497-4972-b705-fa385a6c1b99/mental_health_screening_near_me.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8d91013a-ceb5-4ad9-b9f0-04b8c3ebe19b/nokakalutuvumazovesuf.pdfIn PDF document text
    • https://4b67404f-136a-46a0-9cf3-151f2d38faab.filesusr.com/ugd/241fd5_c220aa4fa59f4b219365110d7e9c570f.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_off0000ff4c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF4C 5392 bytes
SHA-256: 09d15ceebab3e4559f706bf186fa6c2ac3ac5e150b67708190346f36bc2f84a1
font_01_sfnt_off0001118b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1118B 11492 bytes
SHA-256: 3983c84f2ab295ee3d3372efe17b44acbd2a81a657ec7bd682fbfa15b6cf8498

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