Malicious PDF — malware analysis report

Static analysis result for SHA-256 c43f68bb252e5b8a…

MALICIOUS

PDF

68.8 KB Created: 2021-03-15 08:27:45 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: 6ce120f223b9cc6a5cb9f980e9952b87 SHA-1: 54ef9bcc8c9973cefbfa48e54ddd82f5626e873b SHA-256: c43f68bb252e5b8ad43f81caee5f4643549309e92576932fbcc172df04827fa2
186 Risk Score
Tags
free-cdn-ebook-manual-lure

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-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://seumenha.ru/wix?keyword=524+area+code+us PDF link annotation
    • http://kino-vezde.ru/62184583342q32bv.pdfIn PDF document text
    • https://pujowelitolav.weebly.com/uploads/1/3/1/4/131438356/fopok-xipudifoku-bezulibe.pdfIn PDF document text
    • https://vexibalob.weebly.com/uploads/1/3/4/8/134896466/3165889.pdfIn PDF document text
    • https://kuvixajixi.weebly.com/uploads/1/3/1/6/131637850/kuwadibogatovo-didudo.pdfIn PDF document text
    • http://jijufik.22web.org/debating_structure_template.pdfIn PDF document text
    • http://fullcreditreport.info/sportspower_12ft_trampoline_manualb6h0m.pdfIn PDF document text
    • http://trafikcezaodebayisi.com/data_science_do_zero._primeiras_regras_com_o_pythonwyd5f.pdfIn PDF document text
    • https://ludilejufa.weebly.com/uploads/1/3/5/3/135347725/jorasovut.pdfIn PDF document text
    • https://bejasesazopo.weebly.com/uploads/1/3/4/5/134512805/wazadewusufuvulit.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/e125b828-d85b-454a-adca-42a437ec3e47/zelavowaxofumubofob.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7ae501d6-2b83-4a69-b509-95d9b5f65db4/how_do_i_fix_the_latch_on_my_ge_dishwasher.pdfIn PDF document text
    • https://5a060084-92f5-4e09-b02e-bbac8bb45871.filesusr.com/ugd/05c943_3b5791931d2a462e86957ccdc133f321.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/8ebe08f3-7c6d-43c9-aad4-388d61472cb2/21736168736.pdfIn PDF document text
    • https://a98f38e8-5810-4fc9-be6a-c3d78c7c4f9f.filesusr.com/ugd/921909_0f4efd2f73e144d898fe29b12c21aabb.pdf?index=trueIn PDF document text
    • https://2489a575-72f7-492f-b117-28cfe4a4d2a3.filesusr.com/ugd/d81705_42a63415a17748dbaae96d08f39365a3.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/87a1649e-a6e6-44f3-bb5b-98e38b941fd5/ruvosereputejuzavolu.pdfIn PDF document text
    • https://9cf5cc10-3c2e-4e30-ae6b-73ed7beed88a.filesusr.com/ugd/5c2b46_476442d029914da69e393509b6726ef1.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_off0000d0e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD0E4 5148 bytes
SHA-256: dfec0e33f25924edf62360de39ec618756dee99e3b9ffb9b6b6919008ef69115
font_01_sfnt_off0000e27b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE27B 10740 bytes
SHA-256: b4df6a6b5bfe1465acaa407f7804d37a2991cb3636f5108ef450839fb4c6224d

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