Malicious PDF — malware analysis report

Static analysis result for SHA-256 fcb13bd90190f400…

MALICIOUS

PDF

83.7 KB Created: 2021-06-13 17:05:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: f40a5e13a40f87bde43efa0ae9abd33d SHA-1: d062364f3dea7b0c17133397697460353414fb2f SHA-256: fcb13bd90190f400f461408c76f3e4a9554e1c0509433b76ced965527b5dd32a
194 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains a large number of external links, many pointing to disposable hosting, suggesting a link farm designed to redirect users to malicious sites. The presence of a 'download' button heuristic further supports the lure-based attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://crysiq.ru/pbw?utm_term=naruto+vs+bleach+latest+version PDF link annotation
    • https://gumevimarijefa.weebly.com/uploads/1/3/1/0/131071167/sejasi.pdfIn PDF document text
    • https://lafupoboj.weebly.com/uploads/1/3/1/8/131857117/wemibejuzej.pdfIn PDF document text
    • https://zapodebas.weebly.com/uploads/1/3/1/4/131437158/b2c37e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4490128/normal_60483a8f463e5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4426966/normal_5fe83f52cc0c1.pdfIn PDF document text
    • https://tovukofovimo.weebly.com/uploads/1/3/4/4/134485408/1331468.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383586/normal_5fe6f97be7de9.pdfIn PDF document text
    • https://dawetemuvoz.weebly.com/uploads/1/3/4/8/134892381/vaketame-kojage.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4415756/normal_5fd2a8042923f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4377388/normal_605a805f31e68.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4427523/normal_5fd1f8a81efcc.pdfIn PDF document text
    • https://figuxola.weebly.com/uploads/1/3/7/5/137517110/670547.pdfIn PDF document text
    • https://fewanisip.weebly.com/uploads/1/3/2/7/132712603/zofata_gisomofumosevi_pizunotijezorak.pdfIn PDF document text
    • https://devatokur.weebly.com/uploads/1/3/2/6/132683056/xepapa_xavurun_geputave.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369505/normal_604ecbc3c8a23.pdfIn PDF document text
    • https://ruzakemofa.weebly.com/uploads/1/3/4/7/134708924/xalegevep.pdfIn PDF document text
    • https://kudojazejugir.weebly.com/uploads/1/3/4/3/134322101/fojawovoriguguz_rewaxuda_posawaga.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4480145/normal_5fd2ea1549fca.pdfIn PDF document text
    • https://meverofukibax.weebly.com/uploads/1/3/4/6/134620555/8365063.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://uploads.strikinglycdn.com/files/3d7b7e8f-7e87-438d-8ee6-f15b6aa9b1e8/how_to_use_the_kirby_sentria_carpet_cleaner.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/03f68792-1059-419d-8f9c-225a19004e32/72083971628.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1fa03d41-5797-4e9e-beb1-7c8b1a5040cb/como_retirar_dinheiro_do_picpay_empresa.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3e5f689c-2dab-4688-b5d2-d1c486e7ee38/gijugusuwekodobuzapovo.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e344.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE344 4936 bytes
SHA-256: 4f8ba1046fadcc7fd1d969ac29fbfce74c07481ffeb351cb38a0ed99a597db0d
font_01_sfnt_off0000f40b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF40B 10692 bytes
SHA-256: baec56163bf735fc482b712b00f61fffb31f64b8d3f6705274988e1c8a97828e
font_02_sfnt_off0001188e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1188E 17112 bytes
SHA-256: 436829979245b7126098886beec731c3e32f79caaa22165f5cf5bd484c81a714
font_03_sfnt_off000130f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x130F3 4324 bytes
SHA-256: 1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361