Malicious PDF — malware analysis report

Static analysis result for SHA-256 7d794db052f66445…

MALICIOUS

PDF

80.3 KB Created: 2021-04-05 01:02:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: aff7d0333f2cbfd28d7960fd863aa29a SHA-1: 02449afdc0ee3fde9aae0f94cbcfa3d21c8af55d SHA-256: 7d794db052f664450ebb32a1a925f4260f0fec5a44b68c87c5f556ff71cb3147
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a critical finding for a PDF link farm containing 30 external links. The ML classifier also assigned a high probability of maliciousness. The document's content appears to be a lure for free PDF downloads, but the extensive external linking suggests a phishing or SEO spam campaign. No scripts were extracted, but the PDF structure itself is indicative of malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://dafemum.ru/award?keyword=applied+linguistics+pdf+free+download
    • https://lawepisofav.weebly.com/uploads/1/3/4/4/134473025/bisamumezanege.pdf
    • https://bejetatibuket.weebly.com/uploads/1/3/5/9/135957672/pekigabog.pdf
    • http://pokafusolitix.iblogger.org/apartment_lease_contract.pdf
    • https://static.s123-cdn-static.com/uploads/4497697/normal_600477fe1e528.pdf
    • https://cdn-cms.f-static.net/uploads/4501486/normal_604336a3bea9a.pdf
    • https://merirano.weebly.com/uploads/1/3/2/7/132710628/dunolemituduruwem.pdf
    • https://xudufuzed.weebly.com/uploads/1/3/0/8/130815664/c7d7ecc0.pdf
    • https://cdn-cms.f-static.net/uploads/4416932/normal_60432652b19ed.pdf
    • https://cdn-cms.f-static.net/uploads/4388814/normal_6062eed1253a7.pdf
    • https://cdn-cms.f-static.net/uploads/4420939/normal_6064e19a010c9.pdf
    • https://static.s123-cdn-static.com/uploads/4420764/normal_600179aff1605.pdf
    • https://petavigavixate.weebly.com/uploads/1/3/4/4/134459614/63803510c5a.pdf
    • https://cdn-cms.f-static.net/uploads/4453734/normal_600a642820e27.pdf
    • https://wevapagavum.weebly.com/uploads/1/3/4/3/134306171/waxiletefejem-rudelir-vuxizug-pezumoxozeruda.pdf
    • https://gatepeduvemixif.weebly.com/uploads/1/3/4/6/134669895/7029731.pdf
    • https://cdn-cms.f-static.net/uploads/4470968/normal_6022b988e70f8.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://toxisokipefofo.epizy.com/raid_shadow_legends_guide_first_champion.pdf
    • http://domumulavonevef.rf.gd/zarogaxekav.pdf
    • https://64e18f06-8a0e-4dc1-8427-9dd81b4bff36.filesusr.com/ugd/baa514_aec06d69a0204782a421e316a3974832.pdf?index=true
    • http://vixabewe.rf.gd/distance_on_coordinate_plane_worksheet_6th_grade.pdf
    • https://7f06b679-e14d-4525-8955-d56a7cf6f710.filesusr.com/ugd/79e5df_a8ef719dd6e94afe89e11319e4ffdb8a.pdf?index=true
    • https://587b455d-cc79-4428-8e80-a8b75ce23bca.filesusr.com/ugd/021ec8_4e2c0ee51bfe4059a355bf032f672946.pdf?index=true
    • https://4ad55601-b8ab-4ae0-bc0e-e90069072326.filesusr.com/ugd/3aca14_8e7f849f7df34393bb63d51d3390a064.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f1da.bin
2f32373152b86590eb5c993bf8dbb57d20fc33770b92bc1ec6b5fd985d660553		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF1DA 2828 bytes
font_01_sfnt_off0000fbe3.bin
ef9ff4b9eb3d8bad7a3d006f6c8ec51519064db71f26c619753336f15491cbc6		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFBE3 5404 bytes
font_02_sfnt_off00010e6e.bin
f05c856e5bcfc0af981bdc570458a363fc5abb42271cc347b83854ccfeec4dcf		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10E6E 10928 bytes

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