Malicious PDF — malware analysis report

Static analysis result for SHA-256 e423f8bf6a1b6b2f…

MALICIOUS

PDF

117.6 KB Created: 2020-11-14 15:46:49 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: ed390ba4b4b0a9afa9a99a2f85b6b1b2 SHA-1: e3874fe6aa44b5a4e01d4ce35c4022c42212e8ae SHA-256: e423f8bf6a1b6b2fb76ac773c0294c13ab09548e038ef43bb98b30fa34adfa2f
214 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains multiple embedded URLs, with one identified as a malicious redirector. The heuristic 'PDF_SEO_LINK_FARM' indicates a large number of external PDF links, suggesting an attempt to distribute malicious content or engage in SEO manipulation for malicious purposes. The ClamAV detection and ML classifier further support its malicious nature, likely serving as a lure for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://ggtraff.ru/123?utm_term=plato%2527s+three+dialogues+pdf In PDF document text
    • https://cdn-cms.f-static.net/uploads/4367303/normal_5f882402221e7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4427793/normal_5fa05a592a577.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417419/normal_5fa6a957b4fc9.pdfIn PDF document text
    • https://mesaxejako.weebly.com/uploads/1/3/4/0/134097573/fidoxumerividudobij.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387821/normal_5f9662b83380e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403814/normal_5f9fb3e7032dc.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4373297/normal_5f8a42bbaec4f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4410674/normal_5f93bccc7ee6e.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://s3.amazonaws.com/lonozote/gawitikijewesupodes.pdfIn PDF document text
    • https://s3.amazonaws.com/lorifumofelu/77306488171.pdfIn PDF document text
    • https://s3.amazonaws.com/libowebujakux/93323512851.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_off000184ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x184AE 5116 bytes
SHA-256: 7bb6476a7b9ab9b514ed7fef2852419b9e05a7500a5156c09cf7a83527788cd7
font_01_sfnt_off0001962f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1962F 10448 bytes
SHA-256: b228e58dc1be95672908bcb394b11636742befeeb2c5c08a45de8f44908fb586
font_02_sfnt_off0001b9ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1B9AB 4324 bytes
SHA-256: ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3

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