Malicious PDF — malware analysis report

Static analysis result for SHA-256 67b312c4750c193a…

MALICIOUS

PDF

80.8 KB Created: 2021-01-09 09:47:17 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: 57bb111334eefa4526745ae7443d92a1 SHA-1: ef5a700b63b5c07acd98682432e390802348846f SHA-256: 67b312c4750c193a43d29ef54d97e825f1af69d4b9672caf15bd8fd4ffd3b15f
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many pointing to Weebly-hosted PDFs, suggesting a link farm or phishing campaign. The ClamAV detection and ML classifier strongly indicate malicious intent, specifically identified as a phishing trojan. While no scripts were explicitly extracted, the PDF structure and numerous external URIs are indicative of a malicious document designed to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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=cache+creek+casino+bus PDF link annotation
    • https://nopiroradonumiw.weebly.com/uploads/1/3/4/4/134401961/2826146.pdfIn PDF document text
    • https://cdn.sqhk.co/xasexuwosul/YjfAjc2/nasacort_aq_generic.pdfIn PDF document text
    • https://jewefero.weebly.com/uploads/1/3/1/3/131383264/fuvokitozofij-xoriku-nikoloronekilav-fofelomizukas.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4405413/normal_5fd14ae157b33.pdfIn PDF document text
    • https://mixorone.weebly.com/uploads/1/3/1/4/131438240/1ee4b70a4.pdfIn PDF document text
    • https://xupijologa.weebly.com/uploads/1/3/5/3/135327862/8782035.pdfIn PDF document text
    • https://cdn.sqhk.co/vixuzemabad/3FgjGja/17410032317.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4481667/normal_5fd27b5809be1.pdfIn PDF document text
    • https://nebuxulusa.weebly.com/uploads/1/3/5/3/135306634/8517682.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/tutasujal/write_up_for_insubordination_examples.pdfIn PDF document text
    • https://s3.amazonaws.com/sesafefanulokam/all_might_mugen.pdfIn PDF document text
    • https://s3.amazonaws.com/wujodibu/4249315453.pdfIn PDF document text
    • https://s3.amazonaws.com/rurovikejigibu/realidades_2_capitulo_1a_vocabulary_production_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_off0000ff0e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF0E 4964 bytes
SHA-256: c3e99d0739787ca01715210758d1874ca3e471313b4e4f23a66f5d9dddc94e08
font_01_sfnt_off00010fe5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FE5 11328 bytes
SHA-256: ef530189132d60a86a348ecaa25c0b126e8fe81eec7e2bcc33e98ce2897cee14

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