Malicious PDF — malware analysis report

Static analysis result for SHA-256 6351d4e1607a1a5a…

MALICIOUS

PDF

74.8 KB Created: 2020-12-30 00:01:30 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: 0f3bc20f3baedbe7ea3f9440ad087206 SHA-1: 2b37255b8b3644995767b297f0ffeede50867c80 SHA-256: 6351d4e1607a1a5ac02ff779aa326b13f84052fae9d2dafb3c559346991f556f
96 Risk Score

Malware Insights

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

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains an embedded URI pointing to a suspicious domain, which is likely part of a phishing lure for "secure check fail recovery". While no scripts were explicitly extracted, the PDF structure and embedded URI suggest an attempt to redirect the user to a malicious site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 4

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://traffine.ru/123?utm_term=secure+check+fail+recovery PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4459787/normal_5fc257470db75.pdfIn PDF document text
    • https://cdn.sqhk.co/zikegasenar/7hdjajh/bexovasapazusodoz.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4459483/normal_5fd383d0a12fb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4471083/normal_5fbc271dcc80a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374685/normal_5f8f4eedb1b39.pdfIn PDF document text
    • https://cdn.sqhk.co/vizinifum/3Shh3jd/tarasikanararimazewo.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4506063/normal_5fe38befd83dd.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374519/normal_5f8ef77ea1de2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4405206/normal_5fad7dc14a02f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4455380/normal_5fa603b2a7548.pdfIn PDF document text
    • https://cdn.sqhk.co/xetajikok/TsYazQl/97216781553.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4381730/normal_5fb5669d42ea3.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/jasadavebaga/gavofemezuduvajijasi.pdfIn PDF document text
    • https://s3.amazonaws.com/jozaponi/87039181827.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_off0000e791.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE791 5120 bytes
SHA-256: e5c58a9ebc8d9d83592a3d5bd703108a0ea2951dce5c5a9ac25794293061b4a4
font_01_sfnt_off0000f90b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF90B 10888 bytes
SHA-256: 4710c98b211bf5dbdc3461f8370f7251830175542583339ba8ba5631ffe8ea0e