Malicious PDF — malware analysis report

Static analysis result for SHA-256 476a7cd40ed9aa2f…

MALICIOUS

PDF

70.8 KB Created: 2020-12-07 02:15:50 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-24
MD5: bc6fd05f5b782b9cf51b9cf365c632e1 SHA-1: 946ddb4f2ebac7709ffce63a765687ed4ebb567d SHA-256: 476a7cd40ed9aa2f9fa9efcfb6de157e945665e044ebc0ec68f6443681cad6aa
214 Risk Score

Malware Insights

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

The PDF contains a high number of embedded links, with at least one pointing to known malicious redirector infrastructure. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and embedded links suggest an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://cctraff.ru/123?utm_term=3+6+9+tesla+method In PDF document text
    • https://cdn-cms.f-static.net/uploads/4383930/normal_5f8c9a98c70eb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4410956/normal_5f9726580a292.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4498992/normal_5fb82d65610ff.pdfIn PDF document text
    • https://genamimiwovem.weebly.com/uploads/1/3/1/6/131636881/dagapetasavaki.pdfIn PDF document text
    • https://bodukomemewasug.weebly.com/uploads/1/3/4/7/134701633/vowawelaserejis.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367277/normal_5f9a6730c8319.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4464534/normal_5fb2f81b92d13.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4497081/normal_5fb2a87228fe7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4488580/normal_5fb7a41ce5a94.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366034/normal_5f874cfa38d2a.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/c74e9475-6272-4573-b0dd-4e61866a1589/3932724220.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc302a66b97992eb569afe6/t/5fc4df6be18c5c478e94aaa7/1606737772669/konumegopapodukowifara.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc2f58b2cf09257bd796827/t/5fc5dd78cb3e0f57711b02cb/1606802815163/spartanburg_county_register_of_deeds_filing_fees.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/070e2525-8493-403a-8cd4-d651c1de45cf/80440372270.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/74708714-9e7e-49e4-8cae-731abfe1ed7d/93787159975.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_off0000d91a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD91A 5348 bytes
SHA-256: f2730a651ef6597088cec60686010cab95179f60ef1035bfa98aaff9c5149ec9
font_01_sfnt_off0000eb12.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB12 10340 bytes
SHA-256: 538ea4d5ad1e11700a0a1b683ac0044acd322a7d5973054a1fba6a3bae493da6

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