Malicious PDF — malware analysis report

Static analysis result for SHA-256 b73ce135a388fe4e…

MALICIOUS

PDF

73.1 KB Created: 2021-04-05 21:02:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 276087aaa85f18fe2449abd43838a17b SHA-1: 950987d3d6518d9a9fceb867f61ae2727018b9bb SHA-256: b73ce135a388fe4e118ce6985dcee02351de01d18ed9b096ab8d0d9be8e2d22f
126 Risk Score

Malware Insights

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

The PDF document contains a link farm with numerous URLs, many pointing to other PDF files, suggesting a phishing or malware distribution attempt. The primary URL, 'https://soxebez.ru/wix?keyword=btv+solo+crack+download+for+pc', indicates a lure for cracked software. The ML classifier strongly flagged this PDF as malicious, supporting the assessment of a malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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://soxebez.ru/wix?keyword=btv+solo+crack+download+for+pc
    • https://static.s123-cdn-static.com/uploads/4484806/normal_5fdd26145fd42.pdf
    • https://cdn.sqhk.co/zikonidenijo/RsYxhiV/zorofe.pdf
    • https://cdn.sqhk.co/novujarogoga/c9jehhj/86864631572.pdf
    • http://joxezorov.mywebcommunity.org/all_cheats_of_gta_san_andreas_download.pdf
    • http://mexawolin.medianewsonline.com/capricho_arabe_partitura_guitarra.pdf
    • https://static.s123-cdn-static.com/uploads/4375507/normal_5ff8fa5739346.pdf
    • http://pusewuvi.medianewsonline.com/mpdf_page_break_inside_table.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://8323fb4f-9f65-46af-983a-6aec5a87103e.filesusr.com/ugd/84a5c6_c793a8e5cb074a65932f38b2f2a84055.pdf?index=true
    • https://e5baaea7-7007-41de-9367-4ebf3ed55875.filesusr.com/ugd/8e1900_ec4e31324100499c858bab58fe15c87b.pdf?index=true
    • https://s3.amazonaws.com/fuvidokibet/wiles.pdf
    • https://s3.amazonaws.com/loneminovu/anth_south_movie.pdf
    • https://a9b7993f-6967-48c1-a2c3-d5bc86fe985f.filesusr.com/ugd/ea2be3_26f54d89e0cf4437b9709045437ffbd7.pdf?index=true
    • http://fuvarijes.atwebpages.com/autocad_2020_to_dwg.pdf
    • https://4e4301d6-cc9a-4939-960a-6b497c1efea6.filesusr.com/ugd/d78803_2e4151d180ec48878aed2e96772c5f86.pdf?index=true
    • https://s3.amazonaws.com/bidivo/32390145752.pdf
    • https://25f35837-e8ad-4357-b490-8f69bec4165a.filesusr.com/ugd/96c61c_1e44f0b5a36a4e0c9f751f04790dfa55.pdf?index=true
    • https://f1e11ea9-a931-46ad-af30-391325c877dd.filesusr.com/ugd/423518_e3a0ea7896dc489aaf877efe3e0340d3.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://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000deb3.bin
cdddb8f31e5765cf9ae69f8c9a2e127d14ec038755e28e92c5e4665cbfb04c9a		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDEB3 5412 bytes
font_01_sfnt_off0000f14b.bin
632e536132e5207d76d45d3bc4ba8c5407b2ff9fc3e757a5e6c42114b8b2aaab		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF14B 11392 bytes

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