Malicious PDF — malware analysis report

Static analysis result for SHA-256 7ff5f65bbb0d8b4e…

MALICIOUS

PDF

65.3 KB Created: 2020-12-18 18:04:42 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-07
MD5: e5f2bef475251fcc6979334bf9aa4fb7 SHA-1: 31dc482314337338ca7875b57b40ddcd8e60b371 SHA-256: 7ff5f65bbb0d8b4eb6dc4d927955e01f685f74a24982998892b04f05e25f3c4b
214 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, with one identified as a malicious redirector. The ML classifier and ClamAV detection strongly indicate malicious intent. The embedded links suggest an attempt to direct users to malicious sites, potentially for phishing or malware distribution, and the document's structure aligns with SEO link farming tactics.

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
  • 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/strik?utm_term=valentine%2527s+day+lesson+plan+for+kindergarten In PDF document text
    • https://cdn-cms.f-static.net/uploads/4367947/normal_5f8a7634f32ab.pdfIn PDF document text
    • https://zidajikivumab.weebly.com/uploads/1/3/4/6/134625594/5016982.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4499351/normal_5fce98e8c0ce5.pdfIn PDF document text
    • https://lisilabonefep.weebly.com/uploads/1/3/4/5/134527166/3379302.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379849/normal_5f9096509e274.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4414864/normal_5fba79a953d42.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417221/normal_5fb530992f447.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387713/normal_5fb911bc89c6e.pdfIn PDF document text
    • https://wuwenivavubujer.weebly.com/uploads/1/3/1/4/131437756/2042759.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/satudifin/25176107883.pdfIn PDF document text
    • https://s3.amazonaws.com/bezegoluzose/92385579421.pdfIn PDF document text
    • https://s3.amazonaws.com/xupimaral/belling_gas_oven_manual.pdfIn PDF document text
    • https://s3.amazonaws.com/leteraxewe/dipakebasatanekaloz.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_off0000c2cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC2CF 5372 bytes
SHA-256: 0e6339c30c59625e92d183d121697bfc5e2f123533b5de733491bc943ab0494b
font_01_sfnt_off0000d541.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD541 10256 bytes
SHA-256: 48c05b77792f7e01a4ffa6be95a99d1578812df02bbba7bd36be49c739c47944

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