Malicious PDF — malware analysis report

Static analysis result for SHA-256 f947b97bfc2a464f…

MALICIOUS

PDF

111.2 KB Created: 2021-05-31 11:15:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-01
MD5: baa91da4fa4ead7eddd4de1b6c1baa65 SHA-1: 1af483df5fa0e8ad62d075a25027491958cca4c6 SHA-256: f947b97bfc2a464fdc1917a3ea30a9678cb927518ca7089f13aef7c21375d5e6
186 Risk Score

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 0.9995

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/123?utm_term=streamline+english+departures+audio+free PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4409256/normal_5fd2e5c09f8ab.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4426271/normal_5ff63522204ab.pdfIn PDF document text
    • https://gatodewa.weebly.com/uploads/1/3/4/6/134627503/raredibamemo.pdfIn PDF document text
    • https://pudabesipewoz.weebly.com/uploads/1/3/0/9/130969441/mukifagedo_lowozebegamas_kibikewulonusot_xopekodapidap.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4387919/normal_5ff282bbcc808.pdfIn PDF document text
    • https://zegijavevezedoj.weebly.com/uploads/1/3/4/3/134309525/ziket-gafesek-setuwixagesoxip-kowanube.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4489598/normal_5fde69e243d2b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4457843/normal_602a3f9bafb63.pdfIn PDF document text
    • https://telewapoki.weebly.com/uploads/1/3/4/8/134897398/9665117.pdfIn PDF document text
    • https://zitipijasidigor.weebly.com/uploads/1/3/0/8/130874434/gofas.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://fedorahosted.org/lohitIn PDF document text
    • https://uploads.strikinglycdn.com/files/157920a8-901c-4b62-a490-6574d6c8e1ef/potassium_perchlorate_acid_or_base.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/56877450-0cdc-4a44-9391-af02a341d73f/udi_818a_hd_review.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/07ff5550-2805-4676-870f-6beb59e749f8/gejozud.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a55b0571-428c-4e7e-ad15-90a5da277cc8/43287183694.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/53f8bf3a-8d3b-49d0-903f-d2477f1299b5/how_do_i_reset_my_lorex_dvr_to_factory_settings.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8934d951-ff7c-42c6-ae81-e4d630df340e/norabiripapulunoma.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3538adf4-8684-4daa-9a7c-2f865b3b1f20/vedoriwipibopa.pdfIn 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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_006_off00017c51.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x17C51 28244 bytes
SHA-256: 031a5d9f47e087edfc025296bc177d3f43baafc545826b06f1f64f2377f302f3
font_00_sfnt_off0001336c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1336C 5560 bytes
SHA-256: 146791adbe2dc2c29f910628a6c849b0047b57a560f25c6b9d41ed4fa0e7d74e
font_01_sfnt_off00014621.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14621 1804 bytes
SHA-256: 196be1f846450bdb5157b87cf42e9cbf676a8763f1072921ca5678c00e2826fd
font_02_sfnt_off00014f56.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14F56 14300 bytes
SHA-256: 34251dc88cfe37cb3ecc4fb69dd7576e7b361468bc7ae46d383b9f55d849b2cc