Malicious PDF — malware analysis report

Static analysis result for SHA-256 f71778300b66fa7c…

MALICIOUS

PDF

64.0 KB Created: 2020-11-17 16:50:05 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-26
MD5: 5e4c549b0a0fb7d16905ff37abbe72ef SHA-1: 1ed0cae8b1060921e1094d0038b774df6599824b SHA-256: f71778300b66fa7c51e82a6d8bc045e3db2a0d79daff463da2b4f43404793bb9
214 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with at least one pointing to a known malicious redirector. The heuristic PDF_MALICIOUS_REDIRECTOR_LINK and ML_NYX_PDF_MALICIOUS strongly indicate malicious intent. The presence of embedded URLs and the ClamAV detection further support this assessment, suggesting the file is used to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://traffmen.ru/123?utm_term=java+web+services+architecture+pdf In PDF document text
    • https://cdn-cms.f-static.net/uploads/4365601/normal_5f8704dca56dc.pdfIn PDF document text
    • https://bipinutafo.weebly.com/uploads/1/3/4/3/134358532/suxuwibepi.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/sajezife/maintenance_management_plan_template.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/942ba5c8-1eb0-4330-ba23-18866544eb05/mewoxujijepukogipuwixutaf.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e11007a6-5e71-42ef-aa32-ea33a48b3c6a/xosopipubibekefepis.pdfIn PDF document text
    • https://s3.amazonaws.com/numegubowalonan/define_formal_operational_psychology.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e9a2b127-1362-4813-9657-5979cf29ef40/nacho_lee_libro_inicial_de_lectura_p.pdfIn PDF document text
    • https://s3.amazonaws.com/memexelu/32637552658.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/320a8ae0-e651-45fd-806f-fb607710a5a3/zumizume.pdfIn PDF document text
    • https://s3.amazonaws.com/fejififimaketo/fotipubenixerun.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000beb2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBEB2 5492 bytes
SHA-256: 219ca098d3c16f8b82381088221db29a19b6fb648b59c2ef6b9640cb078f3824
font_01_sfnt_off0000d16d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD16D 9988 bytes
SHA-256: c82250ec8f8ae2ef3895f7c841a5c030c348fc56ac1c0b11cad09a9e5b8a0dbd

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