Malicious PDF — malware analysis report

Static analysis result for SHA-256 f087341ce10aa8fe…

MALICIOUS

PDF

102.0 KB Created: 2021-04-01 20:47:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: 84ebd8f644c1f1ee1bd7516317a62f66 SHA-1: 4f9f3e661e82cbd1907e404e32b62e351fc7cea0 SHA-256: f087341ce10aa8fe2d4343cb4959718124849019e03398ce735089e750d7a927
186 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many hosted on disposable domains, indicating a link farm or phishing attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. Although no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of malicious activity, likely related to T1566.001 (Spearphishing Attachment) as the initial vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://fokemale.ru/strik?utm_term=ergobaby+360+back+carry+age PDF link annotation
    • https://povizizumor.weebly.com/uploads/1/3/4/6/134636509/xadika_roguzubal.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4488807/normal_60161067e2aff.pdfIn PDF document text
    • https://wekosidofanepa.weebly.com/uploads/1/3/2/6/132696212/zesafi.pdfIn PDF document text
    • https://litoxixolemor.weebly.com/uploads/1/3/4/3/134379235/1467665.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4377101/normal_6029ea5c94639.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4420260/normal_6040f5a2867f1.pdfIn PDF document text
    • http://tuderoba.getenjoyment.net/9169768845.pdfIn PDF document text
    • https://gozexorajive.weebly.com/uploads/1/3/4/6/134610068/7516481.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4464077/normal_5ffa3827bf6c5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380076/normal_60595f6205fec.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4366004/normal_5fca2cc1310d8.pdfIn PDF document text
    • https://takadoturig.weebly.com/uploads/1/3/4/1/134108809/jubewafadukuluk.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4420745/normal_6054017554b8e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4447880/normal_6044d8ede44f3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4421050/normal_6042f371989d8.pdfIn PDF document text
    • https://pulapiselipatux.weebly.com/uploads/1/3/1/3/131378970/gijikub_jixugazozafok_saxipapufevike.pdfIn PDF document text
    • http://sifuzifixezija.medianewsonline.com/20453842667.pdfIn PDF document text
    • http://pasadurasasagi.medianewsonline.com/sefagelevozuzebitu.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://aaca6425-83b8-4992-a49d-2ec8a2d61848.filesusr.com/ugd/304e3c_b750315e5ace47e9a8945797532ea731.pdf?index=trueIn PDF document text
    • http://dolinoko.atwebpages.com/variables_in_research_methods.pdfIn PDF document text
    • https://78151a86-a557-4e49-81aa-a2539eea45c7.filesusr.com/ugd/204f4f_ffbd9224b08c4b28813f0b187592895e.pdf?index=trueIn PDF document text
    • https://02687da8-bf2b-436b-a8ca-82c6e04513a5.filesusr.com/ugd/e48f8a_e670fac0e6f24192bf0b6ffabbcd9f28.pdf?index=trueIn PDF document text
    • https://b4140449-9b96-4148-8619-c9b3eed7b48c.filesusr.com/ugd/c33cdb_94e93142bb9f4227adc1fde1ae1a462a.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_off0001521c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1521C 5480 bytes
SHA-256: 761352145e77caab1deb2b7e40cfdf49b0c7d7296b46877c5018ce924894deee
font_01_sfnt_off000164e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x164E6 11044 bytes
SHA-256: 477f7b7ebdc480b86971d1cf7e1a4fe38af25a17d0718feabac80c48e2ed3b83