Malicious PDF — malware analysis report

Static analysis result for SHA-256 50689347c7de0248…

MALICIOUS

PDF

98.1 KB Created: 2021-03-03 18:33:36 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-10
MD5: e98578a7901e3da502b6e97cd776f701 SHA-1: 4bc1892513de996ea89c176d571ff7a258c3095c SHA-256: 50689347c7de0248377c4e41fc4f040ab8f80a4769cdfa67c413e2978076129f
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, many pointing to Weebly and other hosting services, suggesting a link farm or phishing operation. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of a phishing lure designed to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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://fokemale.ru/wix?keyword=decomposition+of+fallen+leaves+worksheet+answers PDF link annotation
    • https://lanoxujuzon.weebly.com/uploads/1/3/4/6/134630121/f91fc7e1337.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4412164/normal_6031ddc76a0af.pdfIn PDF document text
    • https://zeruxitewisav.weebly.com/uploads/1/3/1/8/131856065/fokonojasu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4470035/normal_600a3b360da74.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/zerepuzuze/albatross_golf_banguide.pdfIn PDF document text
    • https://s3.amazonaws.com/puretulenuza/45343101864.pdfIn PDF document text
    • https://s3.amazonaws.com/jinabisura/birthday_party_invitation_templates_free_microsoft.pdfIn PDF document text
    • https://s3.amazonaws.com/jovekus/honeywell_5000_installation_manual.pdfIn PDF document text
    • https://s3.amazonaws.com/rurosaveruk/5_tibetan_rites_yoga.pdfIn PDF document text
    • https://s3.amazonaws.com/pokorevalaxex/15800153757.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_off00014347.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14347 5472 bytes
SHA-256: 76f9e4266235d4c24c14d692d418a98ffefe2040a3824eb89338c98ccd987f56
font_01_sfnt_off000155d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x155D1 10932 bytes
SHA-256: efbce5ce291e6e6c11567d3b77f3272c9610fa427169f4253cffc204cbb15440

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