Malicious PDF — malware analysis report

Static analysis result for SHA-256 ea26d7c6dbc6df7b…

MALICIOUS

PDF

80.1 KB Created: 2021-06-11 19:41:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: 441fe814742a41ffad0f2deeee25e612 SHA-1: 05f76af7e4682dbd34a2ee605c6fc1f254173b5a SHA-256: ea26d7c6dbc6df7b3a23c350ba5eb01b3e1d455c83ab60aab13b0a788fe5341f
186 Risk Score

Malware Insights

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

This PDF document functions as a link farm, presenting numerous external links under the guise of search results for game-related files. The primary malicious URL identified is https://krisoc.ru/pbw?utm_term=gta+4+obb+file+free+download+for+android, which likely redirects to further malicious content or downloads. The PDF's structure and the presence of many external links, including on disposable hosting, strongly indicate a phishing or malware distribution attempt, aligning with the 'Pdf.Phishing.Trojan' ClamAV detection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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://krisoc.ru/pbw?utm_term=gta+4+obb+file+free+download+for+android PDF link annotation
    • https://gipasutojemozup.weebly.com/uploads/1/3/1/3/131379868/gasuruni.pdfIn PDF document text
    • https://nazafusi.weebly.com/uploads/1/3/5/2/135297870/476481.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4495976/normal_5ff1cace9e0ee.pdfIn PDF document text
    • https://pefanesixalis.weebly.com/uploads/1/3/5/3/135329455/miwedememad-girikonotoji.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4404969/normal_6056ef5e033a0.pdfIn PDF document text
    • https://gipafefigemer.weebly.com/uploads/1/3/4/0/134097902/7e216c96c712448.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4413454/normal_5fe3d528736d5.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4462732/normal_5fe423a9d5bdc.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369655/normal_6039d97222bf7.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4500450/normal_5fe40b415cf48.pdfIn PDF document text
    • https://sigegasolo.weebly.com/uploads/1/3/4/7/134732441/8cd308200e7.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/ac077715-8509-4dd5-9416-fb3d9b52ce27/13017312587.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5a06053d-5ad6-4ec8-bc5e-6113186a2908/jesozodube.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9c919bfc-4019-45b8-8f38-bfd22a224086/xekipojexa.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e3d84c69-102f-4b06-86b9-29db93cc26db/photoshop_cc_shortcut_keys_mac.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/07ac48f2-808a-4546-b737-cf0b16ff263b/discrete_and_combinatorial_mathematics_by_ralph_p_grimaldi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fafd7751-43e6-41f7-93ee-7de104f899b7/biwirivutopo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3e375f9f-566d-4675-af02-c22e6881ee91/69313333654.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b66be4cc-b183-4e70-b0e7-055220b20646/is_the_six_of_crows_series_finished.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/653c0127-aabd-4f12-b990-6edfd71c4afa/bulukem.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/87cdabfa-017c-4b10-9b58-7ff22ea53916/electrical_engineering_jobs_in_uae_universities.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c46611a5-dd89-47c0-88f9-20492cf25f8f/watasuweredajura.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c6dc5c2a-e3e2-449c-a3cb-fb654cc6befc/garokufadidutiwadab.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_off0000fc7b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC7B 5076 bytes
SHA-256: 1362f3d3254de8575f2d4e390ee2ca75d78a3c13ac316b1f8be6344208707420
font_01_sfnt_off00010dea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DEA 10844 bytes
SHA-256: a5c96fa51d833edeaad4f2cdde7218cc607315147a6b63103ba6b3f5577674ac

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