Malicious PDF — malware analysis report

Static analysis result for SHA-256 40105ee45ed771e2…

MALICIOUS

PDF

64.2 KB Created: 2020-12-07 09:10:09 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-31
MD5: 0991c02ac6d507dac5971b8e9b449297 SHA-1: 62c0983782853973e947e2d0a7caecaf877c1c2d SHA-256: 40105ee45ed771e2f9b7e63a09169c7f2d99b306b481720fd9e6ce2dba63b615
214 Risk Score

Malware Insights

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

This PDF file was identified as malicious by multiple heuristics and a machine learning classifier. It contains a large number of embedded links, with at least one pointing to known malicious redirector infrastructure. The presence of numerous external links suggests an attempt to direct users to potentially harmful websites, consistent with phishing or malware distribution campaigns.

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/strik?utm_term=12+meses+in+english In PDF document text
    • https://cdn-cms.f-static.net/uploads/4408333/normal_5fb8b2d0c8d5e.pdfIn PDF document text
    • https://nijasofefovo.weebly.com/uploads/1/3/4/7/134719995/7869200.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4382790/normal_5fbdc73325053.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403543/normal_5f96de03d1dc1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4468536/normal_5fc1c8fcc582e.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4502870/normal_5fc8891864955.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375350/normal_5f8b615f87855.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4418764/normal_5fa95bfed11bb.pdfIn PDF document text
    • https://zipexozinapewew.weebly.com/uploads/1/3/4/3/134339437/3705399.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://static1.squarespace.com/static/5fc56483e2fce462bca9f74e/t/5fc9af8f887b444c61533b14/1607053200842/wallpaper_hero_mobile.pdfIn PDF document text
    • https://s3.amazonaws.com/migivewuwe/chronicle_of_a_death_foretold_analysis.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_off0000c001.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC001 4884 bytes
SHA-256: 7cd7e3d6e81a4adaa8a76a5938e2e82b4724a4e498fe7da85b355e0698f9969e
font_01_sfnt_off0000d083.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD083 11168 bytes
SHA-256: 51921b6e5269709e21141f0eb9e35220eb4beec1fddd292b44f0786a43b6446d

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