Malicious PDF — malware analysis report

Static analysis result for SHA-256 e21f3c7408ea26df…

MALICIOUS

PDF

74.6 KB Created: 2020-12-07 08:40:55 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 5e2056eea8d5df351845ed16262c2730 SHA-1: db409a54b6124deae0d91023399dd13a5158164f SHA-256: e21f3c7408ea26df5c8cd473133a97df61906549fe59d7b70271b2e7c7789dee
96 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file contains an embedded URL that directs users to a suspicious domain, masquerading as a document about English irregular verbs. Heuristic analysis and a machine learning classifier strongly indicate malicious intent, with ClamAV identifying it as a phishing trojan. The primary attack vector appears to be social engineering via a malicious attachment, leading the user to a malicious site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 4

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://traffnew.ru/123?utm_term=100+verbes+irr%25C3%25A9guliers+anglais+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4374203/normal_5f9078fa1c7a0.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://uploads.strikinglycdn.com/files/38cbef04-1f5f-4be5-8c6e-1052ae9a7fc7/10527242652.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d3b21a2c-ddde-4ed6-ad55-98481f71f95f/filosofa_cristiana_medieval.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/698f51d6-df97-493c-939a-374d2141b547/44142181218.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc10afc403f5353fd968892/t/5fc3b987fa04221c7191a8e4/1606662535819/88337148054.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d16f66b3-4b23-4004-ad97-05f36064386c/75754330936.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5e48e848-0afe-4ee5-b270-284d64166042/19906761814.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f0b66514-cb4d-48ef-a47c-8701ad68ceb1/65829387666.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f5b7f893-a42e-492c-92ec-6335e26169e9/gajopabokojijinobofekite.pdfIn PDF document text
    • https://s3.amazonaws.com/nuselufuzo/99971210784.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b52b6c91-67f0-4e92-858b-3119ee9b2da4/nopisamokemagugil.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d238.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD238 5340 bytes
SHA-256: 620d19071f6ad6f4b8bc96381d0d22b0bf4398c2decb0eb1d272a40439981d1c
font_01_sfnt_off0000e41b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE41B 13256 bytes
SHA-256: 2987f0c9f27c235ef9c35cce5f29e87afa9b81fada66f39f4dd0ae001f54b6d3
font_02_sfnt_off00010d95.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D95 4324 bytes
SHA-256: 4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3

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