Malicious PDF — malware analysis report

Static analysis result for SHA-256 1b8219f26ca77098…

MALICIOUS

PDF

70.0 KB Created: 2020-12-18 04:19:22 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: e4de4660eab13b6f0dcbd361a5276289 SHA-1: e72ad4fb07a88d69a755bf0e761f293660249c26 SHA-256: 1b8219f26ca77098af4fe947fe3689225a0d968cdfd339d768178488c623a621
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and a machine learning classifier indicated a high probability of maliciousness. The heuristic PDF_SEO_LINK_FARM indicates the presence of a link farm with 30 external PDF links, suggesting a phishing or SEO abuse attempt. The embedded URLs, particularly the first two, are likely part of this malicious infrastructure.

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://trafffi.ru/strik?utm_term=st+james+the+less+church+perris+ca PDF link annotation
    • https://letuwolisabir.weebly.com/uploads/1/3/4/6/134602086/811232.pdfIn PDF document text
    • https://nufewaxitobazat.weebly.com/uploads/1/3/4/7/134748461/c9bee22e7e.pdfIn PDF document text
    • https://xereritotof.weebly.com/uploads/1/3/1/0/131070340/4409450.pdfIn PDF document text
    • https://sobemifukoku.weebly.com/uploads/1/3/4/8/134887972/lanakaloraj.pdfIn PDF document text
    • https://xewebetolibas.weebly.com/uploads/1/3/4/3/134372476/63135949107.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/7a499771-dba9-47f5-9ab9-76521114adba/busizaf.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/78d92f20-27a2-4bc9-8b36-933065ce997f/mipopalowapoviman.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/35394682-a35c-4b87-8b0a-615f17c1e302/vepebivubapupopufenaveg.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5a50a43f-f3f1-46f8-8285-fb2da3f435da/acknowledgement_sample_for_project_report.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc6ffef1969b523a41e2079/t/5fcc297d2fa8bc6bcdd9c0d2/1607215487334/62098758574.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc6cffba4d75e5252f0b0fb/t/5fd6bc3affab5d3c560825d0/1607908410898/nhscsp_cervical_screening_guidelines.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a6deef7a-4471-4c0d-8c9a-c81efcbf0534/basics_of_project_management_for_ies.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4347c399-090d-441f-8a67-620a2d12b09e/crire_les_nombres_en_lettres_ce2_exercices.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fbce344be7cfc36344e8aaf/t/5fbd140c7ad7de4c64a4d1cb/1606226959315/police_operation_order_example.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ae2adebd-f5d2-4bf7-8290-ae5848172c2d/96606696028.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fceff5d181af13ce2744de0/t/5fd22138ae71ea6dd327ed80/1607606586170/jabilikopepudigi.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

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c55c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC55C 5020 bytes
SHA-256: 12d200b30950aa261c339ac3ce19d803c395d975c592c2e0054da6d7cc0ea71b
font_01_sfnt_off0000d66f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD66F 11332 bytes
SHA-256: f01421d5cd7f9e50851f44fbbe309f7a3776e075455678256487bc6ef8ae439d
font_02_sfnt_off0000fd0c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD0C 4324 bytes
SHA-256: 1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361

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