Malicious PDF — malware analysis report

Static analysis result for SHA-256 68a00e112f2f55f1…

MALICIOUS

PDF

73.1 KB Created: 2021-03-31 18:38:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: 517f02dec8325f68a20530f8a58fd91f SHA-1: fa448e2e593ef799bc73362dafc73f2b701dadb6 SHA-256: 68a00e112f2f55f13ff7ad87e0997a543ce7cf694c62cd92c32d4b9b4da81b5b
186 Risk Score

Malware Insights

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

This PDF document contains a large number of external links, many of which are hosted on disposable domains, indicating a link farm designed to manipulate search engine results. The primary URL, 'https://jacksth.ru/wix?keyword=troy+bilt+tb130+engine+manual', suggests a lure for users searching for specific technical information. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://jacksth.ru/wix?keyword=troy+bilt+tb130+engine+manual PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4458849/normal_6031582ce24f3.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4498366/normal_5fe402af225a6.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4374379/normal_5ff7bbdc8c89c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383702/normal_600ef4fc71d42.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4496402/normal_6064797664dac.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/gedimuta/13632591966.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/50296bc6-f261-4eb7-a99c-a22d07b5b525/is_cyberpunk_on_ps5_yet.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/38836b10-bd82-407c-8149-a22aa4bb5e38/50_shades_of_gray_novel_summary.pdfIn PDF document text
    • https://9cfe8934-cc69-4f76-a0d0-2e9849ea4530.filesusr.com/ugd/fd9558_86e99faf45394791bc3d550eb4a65100.pdf?index=trueIn PDF document text
    • https://56352102-112a-4456-a677-0775450c4ed3.filesusr.com/ugd/ed4e87_282e962f82c642aab81a7ff30cfe6655.pdf?index=trueIn PDF document text
    • https://d064ede3-316f-4d13-8ec5-014b2136b3bd.filesusr.com/ugd/154db6_f2e11f5fc9da43e389c70e715c492656.pdf?index=trueIn PDF document text
    • https://91c7bc9f-df77-4dbd-ae51-8bcf521f3e61.filesusr.com/ugd/1df9ea_683b06ed57a5490fb9cb50924718fb1f.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/xanunafojuloki/bases_de_datos_orientadas_a_objetos.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0ff1f3f0-e5c7-4d96-998b-14cefaa5f0ee/venufaxifukiwugaxix.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7f138966-29bf-43dd-9d91-a431ccd434ea/kenmore_washer_not_spinning_water_out_of_clothes.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1dec65e4-7fb2-4914-98c4-5fbfee3ccee0/mivovixegikaf.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4d5ac36c-8a75-4207-864a-62ebc6e6a58f/dizitexazopugumonubi.pdfIn PDF document text
    • https://18cb0a1d-3822-48a5-9ca0-56465202bc9b.filesusr.com/ugd/96564c_f03d46ebba0b439486f7ae44c634ea88.pdf?index=trueIn PDF document text
    • https://ad217471-f301-4d07-b05b-71cdb813ff8b.filesusr.com/ugd/4f915f_9d28028709b6474ea5d3648aa2c923ec.pdf?index=trueIn PDF document text
    • https://bad3f395-1638-4667-b349-d6f934eeab49.filesusr.com/ugd/ed2d23_28492a223e8b4451931d11a759077d55.pdf?index=trueIn PDF document text
    • https://5090c2af-253d-40c3-bfb7-942fc6db26b0.filesusr.com/ugd/0511f5_be733bce129e4d79ae2a183bd70c0733.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_off0000e22d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE22D 5376 bytes
SHA-256: 79a760e02574b40914878e6cfd5d43543e85ca38ad6437884e127ad19eabbbc0
font_01_sfnt_off0000f474.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF474 10192 bytes
SHA-256: 6644e544fef9f239ed868beb859becc0f5da161e0ebac622009ae32df1f7f6da

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