Malicious PDF — malware analysis report

Static analysis result for SHA-256 f23605443d509786…

MALICIOUS

PDF

76.9 KB Created: 2021-03-21 22:08:53 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 87148f5b65aac3e23d3d825f4fde74ed SHA-1: 6d71a58af8791c1e9feec9a64ea375003cf61123 SHA-256: f23605443d50978635c94701426a98d882e2ae0e19ad2462402fd5763c2c94b6
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 0.9998

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://xezojetit.ru/123?utm_term=beyblade+games++play+store PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4446496/normal_6014b9e5929a7.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4482869/normal_5ff7beaa00ed9.pdfIn PDF document text
    • http://mevukavotidu.getenjoyment.net/battersea_power_station_history.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4378379/normal_6027c5c1c98fa.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4479441/normal_60097933a18f4.pdfIn PDF document text
    • http://zisuroto.mygamesonline.org/how_to_win_capsim_foundation_business_simulation.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4368985/normal_5ff80ef43f94f.pdfIn PDF document text
    • http://radogomi.mygamesonline.org/martina_the_beautiful_cockroach_theme.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393209/normal_6039d050c56ac.pdfIn PDF document text
    • http://kesuvajeb.scienceontheweb.net/why_does_my_kitchenaid_dishwasher_not_drain.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://1e8c0764-4a0f-46ab-84a2-5f63a8a44928.filesusr.com/ugd/6a0acf_b78ac5cd4ff746b4a0c23e4e2dfe1af6.pdf?index=trueIn PDF document text
    • https://858e1da1-ad31-4e5b-aec0-89c59c6c71f6.filesusr.com/ugd/6240f8_7f26890411264056a653e3cae4b57f8e.pdf?index=trueIn PDF document text
    • https://1c8fadd7-09eb-4d2b-9d42-8e747ba5ce52.filesusr.com/ugd/60625b_95c0ddadacbb422c8ea80a7dc2c74dd8.pdf?index=trueIn PDF document text
    • https://c3f0ce02-b953-40d9-b94a-e38a054f9a35.filesusr.com/ugd/7afb62_2e232d73bd634b9db5381f7fe56b4c90.pdf?index=trueIn PDF document text
    • https://48e6b720-b653-4920-beb0-7ef171ab6ab9.filesusr.com/ugd/d9d1f5_8fde3d21f0ec4baf8138e94f3381f2a5.pdf?index=trueIn PDF document text
    • https://f1e11ea9-a931-46ad-af30-391325c877dd.filesusr.com/ugd/423518_bc47b9d5f8264cd3beb30ad0225570ed.pdf?index=trueIn PDF document text
    • https://75e6061f-eb7a-4ce8-b546-077bf96366c3.filesusr.com/ugd/2dfd19_e91cf190864c4bc382cf88e50ba73b42.pdf?index=trueIn PDF document text
    • https://5fb42ee6-a9be-400a-98f2-f9d4b9f720c8.filesusr.com/ugd/1813b3_5a2c3aa1a6d7424bbbb2cfcc6fb526e1.pdf?index=trueIn PDF document text
    • https://7a512b58-7189-4bc4-8343-f643fa9054c9.filesusr.com/ugd/1e52da_4c790f7c165c4e4da00552bf94f6879c.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_off0000eddb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDDB 5572 bytes
SHA-256: 975d72e5cdd91ed9b0ff83694f08c4b57521bf1a41ff480f6318932b19a6656f
font_01_sfnt_off000100bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100BD 11048 bytes
SHA-256: 78c4ba2dfc8506dae81b211623612d584ec1a713ff58c5055409fea369f47094