Malicious PDF — malware analysis report

Static analysis result for SHA-256 9b9e00e5e959a728…

MALICIOUS

PDF

130.0 KB Created: 2021-05-30 04:29:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-16
MD5: b16177bc2288e0574a6010fd5e15f090 SHA-1: 5e108fc744527fccd12b2feda55472b28e5dd124 SHA-256: 9b9e00e5e959a72805a3bc673fa9bfba7a04bb07219ecee3cee1026efa8c15e2
156 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 point to other PDFs, suggesting a link farm designed to manipulate search engine rankings or distribute malicious content. The primary malicious URL identified is https://ponafet.ru/strik, which is likely used for phishing or to serve a secondary payload. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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 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://ponafet.ru/strik?utm_term=calculo+de+varias+variables+james+stewart+7ma+edicion+solucionario+completo PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4445869/normal_5fcff5fbe39d3.pdfIn PDF document text
    • https://zovipimisog.weebly.com/uploads/1/3/1/1/131163747/ludalonozu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4385620/normal_6047ab82e0589.pdfIn PDF document text
    • https://sapurokegija.weebly.com/uploads/1/3/4/5/134577933/8481457.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4472760/normal_603154734de19.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4386594/normal_60067bac75ef5.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4469640/normal_60026b36c06f4.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4503987/normal_600744c8c1ffd.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4530990/normal_6047fea6359cf.pdfIn PDF document text
    • https://suxasamivozafe.weebly.com/uploads/1/3/4/7/134705269/tefaxefodedigo_zinisagagar_zixaguso_rusum.pdfIn PDF document text
    • https://buvikibera.weebly.com/uploads/1/3/1/4/131453013/2746783.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/6f246469-96b0-4e65-aa91-85449cced2da/rarejopuxuvoze.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/781eb08b-f36d-4897-8bfe-e690cadc2463/dawn_of_titans_mod_apk_1.37.11.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/25d62c4c-13de-49b0-b9f7-62446611519b/kolub.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/25fe2800-9612-4ce6-b06d-cd7d34f1ad0f/1256442191.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cc6bd24c-ebb0-4c17-9786-d531f21493dc/onkyo_tx-sr313_price.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/faf7cbbc-48d8-4e2d-a895-acd61e03f429/powal.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/84bad6b6-0363-48c6-ab86-900b1d14369d/discourses_on_livy_full_text.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/87154342-3edb-47de-b43c-2c8b3add8069/moxaxunoluju.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/acc156ae-6f09-4882-a3d6-e2af691f3598/28042426939.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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001b6a9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1B6A9 5572 bytes
SHA-256: a7159c1eafb7137f352496a245e4ed8284fe5056ac2c9a41cc4de3baab9c622e
font_01_sfnt_off0001c99a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1C99A 14064 bytes
SHA-256: 1f2a5bc2dbf90902514b829ee3fefb1b467e91475fe7a8da416ace0b66351973

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