Malicious PDF — malware analysis report

Static analysis result for SHA-256 2ba890c86b6ed214…

MALICIOUS

PDF

76.8 KB Created: 2021-01-28 18:06:55 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-12
MD5: 09b45a3f6ebc11891f083aa57f0e56c3 SHA-1: 7048fb4f7bae1416bc205e54f7d450c7b3b75656 SHA-256: 2ba890c86b6ed2146e5016ea417ad22f89238e1b81a07ab0ed143dbf67d479f2
214 Risk Score

Malware Insights

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

The PDF file contains a large number of embedded links, many of which point to known malicious redirector infrastructure. The heuristic 'PDF_MALICIOUS_REDIRECTOR_LINK' and 'PDF_SEO_LINK_FARM' strongly indicate a malicious intent to lure users to external sites. The ML classifier also flagged this PDF with high confidence. No scripts were extracted, but the embedded links are the primary attack vector.

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://crophysi.ru/123?utm_term=castle+learning+www.cobbk12.org In PDF document text
    • https://cdn-cms.f-static.net/uploads/4446168/normal_5fd7cc0527b02.pdfIn PDF document text
    • https://mapipuluzobeb.weebly.com/uploads/1/3/1/3/131398440/tiruxabogojusedi.pdfIn PDF document text
    • https://cdn.sqhk.co/rubovadu/bgfdhhX/nitifulixukalawa.pdfIn PDF document text
    • https://kimilofu.weebly.com/uploads/1/3/0/8/130873947/wabixulutiluvaxo.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366623/normal_5fd2ac8b97f73.pdfIn PDF document text
    • https://cdn.sqhk.co/zowolanazew/6931QC4/twisted_road_vs_riders_share.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4367313/normal_5feb8ab2770db.pdfIn PDF document text
    • https://cdn.sqhk.co/zifiguwosu/iaCJggz/71601412992.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4485010/normal_5fef8d129084a.pdfIn PDF document text
    • https://cdn.sqhk.co/felebamifuk/ihe9Q3f/80429017296.pdfIn PDF document text
    • https://cdn.sqhk.co/jugemito/uhjfq7G/juwezuv.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/sesafefanulokam/23721431847.pdfIn PDF document text
    • https://s3.amazonaws.com/bogijexu/joporukuzunu.pdfIn PDF document text
    • https://s3.amazonaws.com/xovajukoxin/loligelifivokepusi.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_off0000ec9c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC9C 5384 bytes
SHA-256: 84483b048677c2a6423acd5ac12c60e06cdf34be4b2b910428123915d06a1c67
font_01_sfnt_off0000ff17.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF17 11516 bytes
SHA-256: 958e6cf23c5688ec2ac435592540489dcc8a192971e14729ec657c874964492c

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