Malicious PDF — malware analysis report

Static analysis result for SHA-256 db31c3661702f517…

MALICIOUS

PDF

77.1 KB Created: 2021-01-03 15:45:45 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: 813490aeac36337021239a7435af12ec SHA-1: 98307df8d9d230184496fe4be27de2b899e8e1cc SHA-256: db31c3661702f517758433f7a9de1992c3591196e4d7281482668baa1ccc2a3f
96 Risk Score

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, likely for phishing purposes. The ML classifier and ClamAV detection strongly indicate malicious intent, classifying it as a phishing trojan. Although 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://trafftec.ru/123?utm_term=fort+fisher+ferry+holiday+schedule PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4484639/normal_5fe66a3c2cdce.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4422367/normal_5f96f44ea057f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365642/normal_5fa64a1401be6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4424009/normal_5f9e887cbbf1b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4488809/normal_5fd3af33d77c7.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4373779/normal_5fcd6791b6a1d.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/mejobu/watch_dogs_2_hd_graphics_mod_apk.pdfIn PDF document text
    • https://s3.amazonaws.com/kefodek/mi_myanmar_unicode_font_apk.pdfIn PDF document text
    • https://s3.amazonaws.com/xuzed/xifat.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4dda0d25-1adf-4f35-a30d-10a4ee3d6016/topezibig.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/96c84aeb-f713-49ea-b19d-959fc30d6044/69406080530.pdfIn PDF document text
    • https://s3.amazonaws.com/kosamupim/cfp_exam_questions.pdfIn PDF document text
    • https://s3.amazonaws.com/kulinisokakewi/pet_liger_for_sale.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_off0000f130.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF130 5164 bytes
SHA-256: 24753eebd34eb9ca79ad4261ca40c7bbc6b1bb1be2fd010ccb927caaff81fac9
font_01_sfnt_off000102c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102C9 10844 bytes
SHA-256: ecc04a9fea59610c76f40d75b327e1e74519adc30faaaccec632629084e63e89

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