Malicious PDF — malware analysis report

Static analysis result for SHA-256 d3a9b7c26dbf4d46…

MALICIOUS

PDF

69.8 KB Created: 2020-11-21 13:35:42 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-26
MD5: 511ee85d1e6ceb9c1a92000abee66577 SHA-1: 1943320cab77aff78b8c443ad8cb154d0ae59ce8 SHA-256: d3a9b7c26dbf4d46639b1be202c7d17cd6d7766d9d3f2bae2c0f9cd54f5abe2b
214 Risk Score

Malware Insights

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

This PDF document contains a large number of embedded links, with at least one pointing to known malicious redirector infrastructure. The heuristic firings indicate a malicious redirector and a link farm, suggesting the primary purpose is to drive traffic to malicious sites. While no scripts were extracted, the PDF structure itself facilitates the attack by hosting these numerous links.

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://gettraff.ru/123?utm_term=el+profeta+de+jalil+gibran In PDF document text
    • https://cdn-cms.f-static.net/uploads/4402951/normal_5f9e79904f2a7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4389585/normal_5fa07cca2c187.pdfIn PDF document text
    • https://zemonawajut.weebly.com/uploads/1/3/4/6/134688337/1505507.pdfIn PDF document text
    • https://gelekale.weebly.com/uploads/1/3/4/2/134266195/ziwininegusik_bujoli_deroxure.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4451736/normal_5fb30cee7bc7c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413566/normal_5fa8427da1c76.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4382407/normal_5fb258bb96acf.pdfIn PDF document text
    • https://guwomenod.weebly.com/uploads/1/3/0/8/130873843/2a5b38eef3430.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408992/normal_5f965f6226985.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/552714d8-d5a8-4998-8d93-ab338705a5a1/60014503164.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8abdfe62-02dc-4654-a641-0710d039b253/78235293961.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_off0000d261.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD261 5204 bytes
SHA-256: f6ecbe497d8edbb8552213f5f3dfdbd62271452de109f173f143ff32cd5c3619
font_01_sfnt_off0000e429.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE429 11368 bytes
SHA-256: a6509e5dfdcedef395cacb03113688c02ade7d487eef4094ac7375a1f2f34445

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