Malicious PDF — malware analysis report

Static analysis result for SHA-256 b806ac47838ba884…

MALICIOUS

PDF

69.4 KB Created: 2021-01-08 00:48:54 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: 17e756a5e0f77da173d884a4d9df3560 SHA-1: baaeb86635ee03943acdd2e321894b2f6a508c36 SHA-256: b806ac47838ba884b6e12f341fb40e30206cc32095fc808d11370ffdfde1ec80
156 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics, including PDF_SEO_LINK_FARM and ML_NYX_PDF_MALICIOUS, indicating a high likelihood of malicious intent. The presence of numerous external links, particularly those pointing to Weebly-hosted PDFs, suggests a link farm or phishing campaign. The ClamAV detection as 'Pdf.Phishing.Trojan' further supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://trafftec.ru/123?utm_term=sherbet+vs+ice+cream PDF link annotation
    • https://vuwugaletop.weebly.com/uploads/1/3/4/5/134588193/248021.pdfIn PDF document text
    • https://vejiledulibona.weebly.com/uploads/1/3/4/3/134318828/7651746.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4495246/normal_5fd9a4f543228.pdfIn PDF document text
    • https://cdn.sqhk.co/busanurutar/QcVohh1/20147976916.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4372073/normal_5f8a85d5c2fc7.pdfIn PDF document text
    • https://sagolofuba.weebly.com/uploads/1/3/4/8/134873879/c82f47.pdfIn PDF document text
    • https://pilidikuvitas.weebly.com/uploads/1/3/4/7/134766888/tamaji.pdfIn PDF document text
    • https://cdn.sqhk.co/tidelefuzin/gghgjhd/tap_tap_tap_clean.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4489245/normal_5fc845742a0ee.pdfIn PDF document text
    • https://nudopimiga.weebly.com/uploads/1/3/1/0/131070212/7507811.pdfIn PDF document text
    • https://fotejisatowonu.weebly.com/uploads/1/3/2/3/132302873/tujawiwelivi.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/jakujakula/course_attendance_form_tu_delft.pdfIn PDF document text
    • https://s3.amazonaws.com/temuxow/pitexaxeke.pdfIn PDF document text
    • https://s3.amazonaws.com/jevelel/46486387215.pdfIn PDF document text
    • https://s3.amazonaws.com/tiduro/tegubamunewo.pdfIn PDF document text
    • https://s3.amazonaws.com/dudujopixejikug/how_to_fill_personal_allowances_worksheet.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_off0000d3d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD3D0 5312 bytes
SHA-256: 991539222f55fe15d0c2d6816d0c94259c47e7b8e9bf630e0b1805b738b96029
font_01_sfnt_off0000e5bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5BD 10420 bytes
SHA-256: 060815b35d254132ba05ed3d2212fde5e9eb1913df69dbfd45865ef5f4da5ed9

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