Malicious PDF — malware analysis report

Static analysis result for SHA-256 853cb5cc1ce27774…

MALICIOUS

PDF

68.5 KB Created: 2020-11-22 11:43:51 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: 135ed1333f2d087ed620cfffeac85610 SHA-1: 3c1739e243f1db6b3be14b782e4c80f8f9328faf SHA-256: 853cb5cc1ce27774d3f5a9a15b66c50b48be1ed886ca3350bec1f8f79238452f
214 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by multiple heuristics, including a critical finding for linking to known malicious redirector infrastructure. It also contains a large number of external PDF links, suggesting a link farm designed to direct users to potentially harmful content. The ML classifier and ClamAV detection further support its malicious nature, indicating a phishing or malware distribution attempt.

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://cctraff.ru/123?utm_term=the+butler+act+1925 In PDF document text
    • https://cdn-cms.f-static.net/uploads/4505096/normal_5fb70218b6b37.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387219/normal_5faaca28d93dc.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374688/normal_5f91621c8a5f4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374379/normal_5f8a0afbe13be.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4377909/normal_5faf53062369a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4389353/normal_5f9642d79806e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367624/normal_5fa9d5eb51fca.pdfIn PDF document text
    • https://menuvudojowakap.weebly.com/uploads/1/3/4/5/134594867/mapisiga.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4382961/normal_5fb91a1e81099.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/765c45c7-9f4f-4054-a1b3-a732367b1801/teorias_cognitivas_del_aprendizaje.pdfIn PDF document text
    • https://s3.amazonaws.com/labitajaxatufib/segud.pdfIn PDF document text
    • https://s3.amazonaws.com/liwafo/87336553112.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_off0000cede.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCEDE 5264 bytes
SHA-256: 78db46d98d7d3c05554b4a9361fb2ec997ad151acadf884fb013ac6990759b6b
font_01_sfnt_off0000e0c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0C1 10784 bytes
SHA-256: 15d8fcbdea0afb6b1205f4303a33e0bb56320485dd909e1e3000d9069f50ebb3

Open this report in the interactive analyzer, or submit your own file for analysis.