Malicious PDF — malware analysis report

Static analysis result for SHA-256 15de41eef9214855…

MALICIOUS

PDF

79.5 KB Created: 2021-05-13 15:50:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: 0a6f3f7d8b0c3f2b436946bb84f152e0 SHA-1: 0b9e2544936538f2648275f403e4ed814b9e5beb SHA-256: 15de41eef92148556d874814938e1a822f654f2e540dd7fed38755b4aa74b036
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many pointing to disposable hosting, suggesting a link farm or phishing operation. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URLs point towards a malicious document designed to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://jumiwimov.ru/strik?utm_term=tone+it+up+collagen+creamer+review PDF link annotation
    • https://cdn.sqhk.co/lenubire/f8fgNG6/thrift_store_main_ave_passaic_nj.pdfIn PDF document text
    • https://cdn.sqhk.co/ximegawaso/aPQhaqt/alphazero_go_paper.pdfIn PDF document text
    • https://vivuguduwidu.weebly.com/uploads/1/3/2/6/132681484/1751983.pdfIn PDF document text
    • https://jowidizikut.weebly.com/uploads/1/3/0/8/130874332/8960082.pdfIn PDF document text
    • https://zizusufake.weebly.com/uploads/1/3/4/6/134646877/623a8151948.pdfIn PDF document text
    • https://cdn.sqhk.co/rufebumu/Tdzgihf/virijugabinezozonuvij.pdfIn PDF document text
    • https://cdn.sqhk.co/jorisuzil/bbgeIsc/falling_lyrics_harry_styles_chords_piano.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/73c4472e-c487-446d-97ca-565ae400a5e3/what_happens_to_brenda_in_the_maze_runner.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fcf9cfa8-2413-4709-a721-a84a23a3a2d4/plantronics_m70_problems.pdfIn PDF document text
    • https://7095e710-59ac-4d27-8a5a-f3bbcaf65deb.filesusr.com/ugd/418e76_a56359abd27d420590693666ad77f01d.pdf?index=trueIn PDF document text
    • https://81da36f4-dec6-4bf4-836b-19ed67500659.filesusr.com/ugd/5fd5c1_62e4ed3e84d74c7ca749d089c9e0cf5b.pdf?index=trueIn PDF document text
    • https://24976a62-ea59-4ca6-8500-d0bd08f9a094.filesusr.com/ugd/65a075_77e1e0b49bd54b9c9e1c78a39c93df50.pdf?index=trueIn PDF document text
    • https://e2604e0b-f95a-4acb-b53f-a7db3827b2a1.filesusr.com/ugd/225520_1cd50705475848f581141edf0604576d.pdf?index=trueIn PDF document text
    • https://590703a0-be71-4d3c-a49f-17767d5969ef.filesusr.com/ugd/656c20_8a4aa0a3c3054f18a5dab76d044ee7eb.pdf?index=trueIn PDF document text
    • https://86042ffc-9b62-460b-8552-fb2522205a17.filesusr.com/ugd/4f92c1_48a5d255ac2b4552aae498d7a8c278c8.pdf?index=trueIn PDF document text
    • https://2e6726a7-2e78-456a-9fa1-8bc85c3b20a6.filesusr.com/ugd/76e31d_dd8cc0c2ddb24487bc28020fdd9e757e.pdf?index=trueIn PDF document text
    • https://f867c6cd-7aae-4938-a634-6821dcb48262.filesusr.com/ugd/eb45fa_6fbd7b2dfde34a5c95a483750f1a595e.pdf?index=trueIn PDF document text
    • https://1c92f6d8-19eb-429c-9239-1cf6be91372f.filesusr.com/ugd/cc1a03_b1ef941ac8344436b4a3fb769c85dc1c.pdf?index=trueIn PDF document text
    • https://ec5c17a1-061e-4a2c-a9e6-b3561ba71229.filesusr.com/ugd/299074_d884f08c29df4874bf2627012c856176.pdf?index=trueIn PDF document text
    • https://72b50e20-f79f-40ca-96b4-24bef83e308f.filesusr.com/ugd/1a1092_41e674eb533a4271a0eb8fdf96f11c0d.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/1129bff2-0b8a-4639-b24a-7f01a99a9133/catalina_30_owners_manual.pdfIn PDF document text
    • https://599b09cd-7b6a-4758-94a3-08a08d316165.filesusr.com/ugd/628a76_d448a17636ba41688f18c0753789cc5c.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_off0000f76f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF76F 5176 bytes
SHA-256: 4bd8841885aad6b67c9ac4a8339479ddd226375194b06c3e1fef2d29be02654a
font_01_sfnt_off0001090b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1090B 11428 bytes
SHA-256: c76656df14140f9e0363aad4b2450218e902afefae0b02dcd38f91b58611c3f0

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