Malicious PDF — malware analysis report

Static analysis result for SHA-256 3974c27999f83949…

MALICIOUS

PDF

71.4 KB Created: 2021-01-11 10:15:48 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: bf8790977ec288e1ea4e5435ff0e880a SHA-1: 1c0ba8ab7aa0d7d482efda744e196b02c36d177f SHA-256: 3974c27999f83949d04bec2795bae0d05f4fdaf70b022401c8e888a1dc8ab349
156 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many of which are structured to appear as search results for popular media, indicating a link farm or phishing attempt. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and numerous external URLs point towards a malicious document designed to redirect users to potentially harmful content.

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://trafficel.ru/aws?utm_term=baaghi+3+video+songs PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4489976/normal_5fe61b7389cbc.pdfIn PDF document text
    • https://xixebume.weebly.com/uploads/1/3/0/9/130969831/fuxafa.pdfIn PDF document text
    • https://redunexodozik.weebly.com/uploads/1/3/0/8/130814050/gigawofu.pdfIn PDF document text
    • https://laludigulasi.weebly.com/uploads/1/3/1/4/131437637/fusabosita_rijiwu.pdfIn PDF document text
    • https://jotukodapoze.weebly.com/uploads/1/3/4/6/134632246/mofegeve.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4464319/normal_5fded79e775d0.pdfIn PDF document text
    • https://site-1200539.mozfiles.com/files/1200539/58365463197.pdfIn PDF document text
    • https://jatorogerujew.weebly.com/uploads/1/3/2/7/132710569/bawap.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4413846/normal_5fc3d0b94df8c.pdfIn PDF document text
    • https://site-1166618.mozfiles.com/files/1166618/whatsapp_apk_pure_apk_download.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/bamepofewalada/taobao_apk_for_tablet.pdfIn PDF document text
    • https://s3.amazonaws.com/zafaronivaj/3545221913.pdfIn PDF document text
    • https://s3.amazonaws.com/luramamelolem/what_is_a_primary_producer_example.pdfIn PDF document text
    • https://s3.amazonaws.com/kexamoxusinixu/98790498834.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_off0000d87c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD87C 5232 bytes
SHA-256: c047882718e30f1097fc0e56cbd74eaeaf38f660d2533db3cd6d5c570addcbe2
font_01_sfnt_off0000ea50.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA50 11348 bytes
SHA-256: d35abf05f74fa62733953f68a5dd03ad1ffe03665818174f10187219f4ca7255

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