Malicious PDF — malware analysis report

Static analysis result for SHA-256 451c6b9d2e4feee3…

MALICIOUS

PDF

72.8 KB Created: 2020-12-30 16:14:44 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-20
MD5: 4c9e5d2f01765ef80ef9d077116ba784 SHA-1: 0a1b0493fc6f16da3b6b6b56ad78ebe7ff533425 SHA-256: 451c6b9d2e4feee3d43805646ca0d3b4e02ee29cf475202c13fa5327c988f941
186 Risk Score

Malware Insights

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

This PDF document is identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, directing users to numerous external URLs, many hosted on disposable domains like weebly.com, under the guise of providing drawing tutorials. The presence of external URIs and the PDF_SEO_LINK_FARM heuristic strongly suggest this document is designed to drive traffic to potentially malicious or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • 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.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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://trafffi.ru/wb?keyword=cute%20animals%20to%20draw%20step%20by%20step PDF link annotation
    • https://riwozetamozu.weebly.com/uploads/1/3/4/3/134331456/5123554.pdfIn PDF document text
    • https://gifofelonapa.weebly.com/uploads/1/3/0/7/130775883/7365161.pdfIn PDF document text
    • https://rokufekajo.weebly.com/uploads/1/3/0/8/130814342/9682539.pdfIn PDF document text
    • https://zafasasuk.weebly.com/uploads/1/3/4/7/134713251/3440515.pdfIn PDF document text
    • https://sesesisemiv.weebly.com/uploads/1/3/4/7/134746737/7206623.pdfIn PDF document text
    • https://muzufuwuvul.weebly.com/uploads/1/3/2/3/132302955/mekinepuwogu.pdfIn PDF document text
    • https://lagonola.weebly.com/uploads/1/3/4/8/134851586/f0098356bef8cf.pdfIn PDF document text
    • https://folemazilepi.weebly.com/uploads/1/3/1/1/131164248/8711683.pdfIn PDF document text
    • https://navaraze.weebly.com/uploads/1/3/4/6/134682655/sizis-sivetaxibuvev-zozuru.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/029f3c75-50ed-439f-8b8d-ec1c022a34f2/chemistry_a_molecular_approach_third_edition.pdfIn PDF document text
    • https://s3.amazonaws.com/rorives/north_canton_eagles_club.pdfIn PDF document text
    • https://s3.amazonaws.com/jukoxisojow/manuscript_format_business_report.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_off0000e136.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE136 5344 bytes
SHA-256: 4911a5a0a57233ed4a680f028d3e1f5862b662cc3b430642ac0917d2e660edf3
font_01_sfnt_off0000f350.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF350 10272 bytes
SHA-256: f3a04602b3e9731f90b4f64b707964b54f110082c0ef16e33bbf3b8f3d51b627

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