Malicious PDF — malware analysis report

Static analysis result for SHA-256 8ba421e554112af7…

MALICIOUS

PDF

82.1 KB Created: 2021-03-23 22:45:37 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-30
MD5: 0d25f6f893f30dee55143c60f942edb4 SHA-1: cd93f0a4070f4494aa0fe972929b26c5e367efa5 SHA-256: 8ba421e554112af702e9f408628acfaf57eb55ae07317a1ce51d2643a641e9b3
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, with one specifically pointing to a URL related to 'learn english pdf online', suggesting a phishing or SEO spam lure. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or distributing further malware. No scripts were extracted, but the PDF structure itself is used to host and link to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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.
  • 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://pelibifir.ru/award?keyword=learn+english+pdf+online PDF link annotation
    • https://cdn.sqhk.co/jabosuve/eihjdSI/64419469808.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4476567/normal_605437ec3795f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4460980/normal_601607c5d6059.pdfIn PDF document text
    • https://cdn.sqhk.co/pofaxexaxi/ihQ9dMm/3234874964.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4470542/normal_5fc79b83a0b36.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4450158/normal_5fe199211a733.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4420906/normal_5fe17ad07056c.pdfIn PDF document text
    • https://cdn.sqhk.co/vituxezij/5ievi4t/classifying_numbers_chart.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://234d5d8d-19c9-4cab-a884-dd0775662658.filesusr.com/ugd/fb7225_fb720f98889841d0b76afeb78d1e3978.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/21c1a300-0d0d-4b46-b38e-3a45abb66039/how_to_make_xfinity_my_homepage_on_microsoft_edge.pdfIn PDF document text
    • https://s3.amazonaws.com/tugumeb/astrophysics_career_guide.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5f94835b-c8e7-44d5-8ddc-7d8cefe4d0e3/97335906061.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/265cb220-6c6a-471f-9824-a1879a0f5bc9/ancient_greek_mythology_gods_and_goddesses.pdfIn PDF document text
    • https://s3.amazonaws.com/pisik/petinozorupelofadever.pdfIn PDF document text
    • https://s3.amazonaws.com/sixolose/ejercicios_de_ecuaciones_de_primer_grado_con_2_incognitas_resueltos.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0729c35c-8409-4298-b2f3-7534f4eedc73/excel_vba_message_box_with_2_options.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/804f96b1-88e1-4a03-8643-70c74bf301d1/2020_toyota_camry_se_awd_accessories.pdfIn PDF document text
    • https://bb0106b8-f3e0-414b-a873-a0e24df3f2ad.filesusr.com/ugd/b84a33_8c7f0d42939647e6aee3b8988a1b74b7.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f69c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF69C 4952 bytes
SHA-256: e3308a108d6d93ff9696b28aa6edc4009354690b1ad65f9187ed7ed50c1937e5
font_01_sfnt_off00010761.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10761 11244 bytes
SHA-256: 4becbfa58002317475b60e1bdd3eba80326da7f4a876c8adf5149c8abc2ec2a7
font_02_sfnt_off00012d52.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D52 4324 bytes
SHA-256: ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3

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