Malicious PDF — malware analysis report

Static analysis result for SHA-256 a24765876dc8c1d2…

MALICIOUS

PDF

74.1 KB Created: 2020-12-18 14:26:41 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: 1b96a7b8382cf227d994372a28cbf376 SHA-1: 72deec8c813d9b4c1c33bc1d194d20a484dd50b2 SHA-256: a24765876dc8c1d2ee3f1ee34b6237660aeac0cda5c36d7279caeeb1ebaaa14f
156 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many of which point to potentially malicious domains, indicating a link farm or phishing attempt. The ClamAV detection and ML classifier strongly suggest malicious intent. The primary malicious URL identified is trafffe.ru, which is likely used to host or redirect to further malicious content.

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
  • 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.
  • External URI info PDF_URI
    PDF contains an external URL action
  • 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://trafffe.ru/strik?utm_term=duty+desire+and+the+desert+king+read+online PDF link annotation
    • https://jajijonag.weebly.com/uploads/1/3/4/7/134762104/360507.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370533/normal_5f8a2852cde70.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4495385/normal_5fb7630232f18.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4411489/normal_5fab191609cbc.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/e0d7f6f3-6d42-45ff-aa6b-b1d3896e0999/21544519683.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/31721e9a-c307-47eb-8795-d379354af652/nogisepupala.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/99dcd6e5-06ef-4a0b-afdd-ab5ee2fc4a82/ejemplos_de_desviacion_estandar.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9a9acddf-2ede-4251-a704-a9b71c77bcc4/porque_no_los_dos_giphy.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/391a8e6f-8b0a-4d60-940d-b45694ba546b/pomazufawuwoguz.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0db1c842-a942-4ee7-8221-786c14f80429/majalob.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_off0000e474.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE474 5252 bytes
SHA-256: 9149c8240f7c9cbbe85471ee80a2893f969763ba3e33dca302dd7eef17b853d9
font_01_sfnt_off0000f65b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF65B 10884 bytes
SHA-256: d26c1194fed2f1de54007fd9228d092a5e111f1170742cfcac1ef66c740f41d9