Malicious PDF — malware analysis report

Static analysis result for SHA-256 8b271e7e4930c592…

MALICIOUS

PDF

154.9 KB Created: 2021-03-16 23:41:07 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: 43de6c9d123602216d02e693ca678e62 SHA-1: 5b27da636611facc83b0e058dbf65616ef488d74 SHA-256: 8b271e7e4930c592b5ae57f2b46fe6d5c95390b376aa40283f9deb41c7b128f6
126 Risk Score

Malware Insights

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

The PDF contains an embedded URI that redirects to a suspicious domain, identified as a link farm on disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URLs suggest an attempt to redirect the user to a malicious site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

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://resalured.ru/strik?utm_term=el+amor+en+tiempos+de+colera+resumen+por+capitulos PDF link annotation
    • https://cdn.sqhk.co/debefuki/aejciiF/gajojilajepol.pdfIn PDF document text
    • https://cdn.sqhk.co/nevupediwix/jdhjih4/papefu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4421048/normal_602b2c2fcc3ec.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4378827/normal_5fe8659b79b97.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4369318/normal_5fc95299b3c68.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379474/normal_603f1da3232fb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4404488/normal_5fe91c73948cb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4483365/normal_6013930ac89fa.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368982/normal_601af287374c3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4426944/normal_600f5dee4f777.pdfIn PDF document text
    • https://cdn.sqhk.co/xadeviro/iWhdigg/tatad.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://cbb9655c-b60d-4095-8c1c-bb5f9a2903c5.filesusr.com/ugd/4dd980_4311a45a5b5e474897ad9cf8cad791de.pdf?index=trueIn PDF document text
    • https://81da36f4-dec6-4bf4-836b-19ed67500659.filesusr.com/ugd/5fd5c1_375213ed3d5c45d5826f4d7e8b7c98c0.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/e55ea54b-642f-46f0-8e64-ad1f63f70fea/song_of_ice_and_fire_audiobook_length.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e517ca0c-826d-40c1-9025-9cae7e0c0357/formas_de_comunicacin_escrita_en_la_empresa.pdfIn PDF document text
    • https://5fdaa9e0-ad6d-443b-8779-beb8e45026dc.filesusr.com/ugd/05301a_85844bb4cf204660a696d87032961c2a.pdf?index=trueIn PDF document text
    • https://3c2b787d-8465-4662-bdcc-bf736d584291.filesusr.com/ugd/8760e7_981ced919a0747d895136f76a44a18ea.pdf?index=trueIn PDF document text
    • https://cef8af8d-7071-4339-ac50-fc417d371010.filesusr.com/ugd/a89196_dd47ee626fa64a8d80d75e43ec275173.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/1fa02809-b592-4f74-a95a-632b96a6e1e4/47233429117.pdfIn PDF document text
    • https://9e1bd277-069e-4713-bdcc-1ab96cf790c3.filesusr.com/ugd/5fd2af_df7e5b08cbc0464daf25f2fdc285d010.pdf?index=trueIn PDF document text
    • https://a0f88182-e1f9-4a9c-ba22-d5ce004c6985.filesusr.com/ugd/2f3216_c1bbc3886d444ae0ab165e927fffbd37.pdf?index=trueIn PDF document text
    • https://9f349447-249b-4747-956a-316fe86e371b.filesusr.com/ugd/d2b720_03bd24bae4ea484498ea03b6960807cf.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/a6679f99-ef11-4438-9c15-ac9ab16a05db/how_can_i_help_my_5_year_old_with_social_skills.pdfIn PDF document text
    • https://33da92c3-26de-4f6b-bf12-1693cb6a6e79.filesusr.com/ugd/0307f2_4d20dca785ba4756b39e4a409e1ed7f6.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_off0002226a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2226A 5176 bytes
SHA-256: 98cd641ced8dccc5076e2f1434773804a031d953907ff1e476d9a04091800655
font_01_sfnt_off000233ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x233EE 12028 bytes
SHA-256: 313d839b8b6d3cb5de686ff215905756993b8afb214582e00241dcb13d679b9b