Malicious PDF — malware analysis report

Static analysis result for SHA-256 50c24e0913bf2fac…

MALICIOUS

PDF

61.8 KB Created: 2020-12-07 06:32:56 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-26
MD5: 30598180f8cca0ff6e90f516c766c656 SHA-1: 5d13a26efa682ff6683c682581a1f9a0bbca373d SHA-256: 50c24e0913bf2facad9489b572e200ab014f09cf5f20f8db2fcc6cc83e6b879a
214 Risk Score

Malware Insights

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

The PDF contains multiple embedded links, with at least one identified as a known malicious redirector. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or distributing further malware. The presence of numerous external PDF links suggests a link farm designed to obscure the ultimate destination or to appear as a legitimate content repository.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://traffmen.ru/aws?utm_term=6b+judging+by+appearances+answers In PDF document text
    • https://cdn-cms.f-static.net/uploads/4407983/normal_5f96b6dc40d68.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379473/normal_5f9245ed5dc94.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4485828/normal_5fb8e758c425c.pdfIn PDF document text
    • https://jeponiruwapin.weebly.com/uploads/1/3/0/7/130776483/dc08bc99176d144.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4471096/normal_5fb4d9768c76e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4377647/normal_5fb8f7565fc22.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/a5862efb-18e1-4a66-9a8d-46cc61990c4b/moral_diplomacy_impacts.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc59fd8239b072291516773/t/5fc6e67e3ac9c763f4c7fc15/1606870654828/jevobogitusix.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/19fe57a1-fa08-4983-a797-3c983da72dd7/74325327750.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/14c16fbf-8908-4679-ba93-486cf5047993/649017600.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_off0000b13f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB13F 5676 bytes
SHA-256: cf517fe052c5fe72f2d688c1ba0b3934017cbadb6068cfdb378a41eec411e4c6
font_01_sfnt_off0000c4ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC4AD 10928 bytes
SHA-256: c7e9b2f733a89e85f7e112a43887b52ff958d54caee876a376a9d75af267a8e3

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