Malicious PDF — malware analysis report

Static analysis result for SHA-256 a556025b67137691…

MALICIOUS

PDF

81.8 KB Created: 2020-12-03 22:43:58 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-05
MD5: 45b08428de807d576a7dfde60a2860b7 SHA-1: ba788b8e40353a6795ad95cae61383a8a3751171 SHA-256: a556025b67137691a3b00254314cb8359da6c0c5a88c6bac791e1072e758b1f8
96 Risk Score

Malware Insights

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

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains an embedded URL pointing to 'trafffi.ru', which is likely a phishing or malicious site. The document body is heavily obfuscated, but the presence of the URL and the heuristic firings strongly indicate a phishing attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://trafffi.ru/strik?utm_term=babel+parents+guide PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4367944/normal_5f8d63f707e3a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370985/normal_5f8be8d4ada68.pdfIn PDF document text
    • https://siravexadobema.weebly.com/uploads/1/3/4/3/134320718/8849246.pdfIn PDF document text
    • https://bonesinidojesu.weebly.com/uploads/1/3/4/5/134591006/serofusifudim-zepevoj-jasidejubi.pdfIn PDF document text
    • https://gomemetunugup.weebly.com/uploads/1/3/2/7/132712315/sotorirazajedi-turajotatufa-rosuw.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4458125/normal_5fb5a7ac86694.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/vokeri/67177826857.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc0055e5687f52b6b7c450a/t/5fc15d124e98326c024342d7/1606507795027/bagibesaselajuxatupazixo.pdfIn PDF document text
    • https://s3.amazonaws.com/nufidibodudulad/23998231233.pdfIn PDF document text
    • https://s3.amazonaws.com/bupijila/factoring_grade_10_worksheet_with_answers.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_off000103e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103E8 5316 bytes
SHA-256: 8eae2f76ff72a6c1062e923fdef3839de6e08ce6a09acc59faceb77754c45495
font_01_sfnt_off00011600.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11600 10912 bytes
SHA-256: 4d8c953e21b47e48046aab05f13b310ab23fe3a48745bfdfca0d579b2cf53f3b