Malicious PDF — malware analysis report

Static analysis result for SHA-256 6a5438a85038c765…

MALICIOUS

PDF

84.3 KB Created: 2021-03-24 09:32:53 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ba400503af06fc69d9afd321874cb4af SHA-1: e7205eecb942ca80ebfe5d0cb2aaaadff6598811 SHA-256: 6a5438a85038c7650557547c562c23a42f78d63bee88b8708d5e7d90f296d93d
96 Risk Score

Malware Insights

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

The PDF contains numerous external links, with a significant number pointing to PDF files, suggesting a link farm or SEO manipulation tactic. One prominent URL, 'https://gimoguvi.ru/strik?utm_term=how+much+does+a+hill+rom+versacare+hospital+bed+cost', is identified as a potential entry point. The ML classifier strongly flagged this PDF as malicious, and the presence of embedded URLs supports the attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

Heuristics 4

  • 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.
  • 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://gimoguvi.ru/strik?utm_term=how+much+does+a+hill+rom+versacare+hospital+bed+cost
    • https://static.s123-cdn-static.com/uploads/4495841/normal_5feb1c3abefe2.pdf
    • https://cdn-cms.f-static.net/uploads/4450419/normal_600a57cb6e7c6.pdf
    • https://cdn-cms.f-static.net/uploads/4481834/normal_6016e4263e444.pdf
    • https://fulotagefopag.weebly.com/uploads/1/3/1/8/131857199/nebazivuviza.pdf
    • https://cdn-cms.f-static.net/uploads/4496380/normal_604912967ee37.pdf
    • https://cdn.sqhk.co/tasiteregixo/pjchiDB/regency_theatres_van_nuys.pdf
    • https://cdn-cms.f-static.net/uploads/4377905/normal_5fe9ee1360648.pdf
    • https://vogexuweju.weebly.com/uploads/1/3/0/9/130969932/4ab02e3272e41.pdf
    • https://dowidevegep.weebly.com/uploads/1/3/1/4/131406741/5120016.pdf
    • https://cdn.sqhk.co/sepagumal/gEFUhgB/80912005201.pdf
    • https://cdn.sqhk.co/naziwixolagu/YCHjjPO/joplin_schools_jobs.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://8546b567-499d-44cb-812b-f4cb210fa0cc.filesusr.com/ugd/1f0b74_56b5623b99424ca8b586c9490e37df5a.pdf?index=true
    • https://b064d0e4-88d6-4b7e-8087-8ebf790fcba6.filesusr.com/ugd/ca32a8_a62c56a7595f4e0aaa6c1f1f46f16f99.pdf?index=true
    • https://uploads.strikinglycdn.com/files/3908cee2-e092-47b9-bde8-a6b38b10863f/14718953186.pdf
    • https://uploads.strikinglycdn.com/files/f44d9b78-a9cc-4183-a450-ee2d693fd72f/verbal_irony_in_the_machine_that_won_the_war.pdf
    • https://1a899ca6-11bf-4464-971e-4bf0b885e765.filesusr.com/ugd/4ac3ff_5a2138320e494129b2338652a6c26262.pdf?index=true
    • https://caf0f927-206f-4b4e-aa34-0dd3da53679b.filesusr.com/ugd/83d902_971dee00188946b5a9f26ef1b0158dae.pdf?index=true
    • https://4461694d-a6f7-4a69-895a-ff5ddeb3c622.filesusr.com/ugd/f504fb_bc72a65547f44c34b459b21edd08c72a.pdf?index=true
    • https://24a70dd4-b549-4b9e-9c0a-6eea45ab85ad.filesusr.com/ugd/ab0c63_efd0ea3b7c8e4e619531db9564d1a7f0.pdf?index=true
    • https://uploads.strikinglycdn.com/files/1f83e60b-f49e-4c20-9e60-c09a7e2b561f/what_is_gauss_law_for_electric_flux.pdf
    • https://6b52f5a6-db44-4d3e-8337-ab33c729cb13.filesusr.com/ugd/f4de5e_eef86d03afc04240961426228b189eff.pdf?index=true
    • https://uploads.strikinglycdn.com/files/12f600ee-f44f-48e3-8d2c-41b710f9e024/rumulitigib.pdf
    • https://e8f98835-b194-42a5-b43f-fe2f29920dd6.filesusr.com/ugd/bf650e_df471f21be9c45b4a1f1983f5f64772a.pdf?index=true
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License
    • http://scripts.sil.org/OFL

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off00012942.bin
6b8a8f1ee99908c72bf0ccf71ed4252fc2e97ce2e8b58bd24fc32fdae0f65875		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0x12942 16888 bytes
font_00_sfnt_off0000ed0a.bin
d5e75eff076c67b2fb241cebe1dc2cc1c3d2edbcf4f377f618bd19fe5e0c2940		 pdf-font-stream PDF embedded font (sfnt) at offset 0xED0A 5568 bytes
font_01_sfnt_off0000ffd9.bin
4057307b3fc90f66647f33482baffddc585d2bff2a05cc349233c8d18269442e		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFFD9 12296 bytes

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