Malicious PDF — malware analysis report

Static analysis result for SHA-256 423f3e05ef822b97…

MALICIOUS

PDF

93.2 KB Created: 2021-03-01 22:49:35 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-13
MD5: 27e434caefe73c8b78f88128b4c62164 SHA-1: 97dd9421573707c0fd8aae1937a3cce97afa0999 SHA-256: 423f3e05ef822b97ec91e3b540549d3410d0acbbe817435e1fba54e9bfe3df0c
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 of which are to SEO-optimized content farms, indicating a link farm or phishing attempt. The ClamAV detection and ML classifier strongly suggest malicious intent. The presence of embedded URLs and the PDF_SEO_LINK_FARM heuristic point towards an attempt to direct users to potentially malicious or phishing websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://kuzutuzo.ru/wix?keyword=old+town+guide+147+used PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4402501/normal_602459b428cb7.pdfIn PDF document text
    • https://litolojinoforiw.weebly.com/uploads/1/3/4/7/134721995/jorapetuxetobuvep.pdfIn PDF document text
    • http://icily.xyz/2981893797v9u67.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://loxazugexola.epizy.com/kenmore_elite_refrigerator_model_795_thermostat.pdfIn PDF document text
    • https://s3.amazonaws.com/rufonali/b_tech_ebooks_free.pdfIn PDF document text
    • https://s3.amazonaws.com/pusolefosex/advantages_of_being_an_entrepreneur.pdfIn PDF document text
    • http://jidodurej.epizy.com/ancient_civilisations_worksheets.pdfIn PDF document text
    • https://s3.amazonaws.com/zomuzigo/85235593453.pdfIn PDF document text
    • https://s3.amazonaws.com/vavejijitatofu/fraction_division_by_whole_number_worksheet.pdfIn PDF document text
    • http://nobitinajed.epizy.com/54733995071.pdfIn PDF document text
    • https://s3.amazonaws.com/pirofopafu/irvington_ny_weather_report.pdfIn PDF document text
    • https://s3.amazonaws.com/mipizaju/bamopituda.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_off00012447.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12447 5028 bytes
SHA-256: e5159aa3c3f7b1d10ac1afdcd0b4a32403175c52d65f17c37d2cb94920ad9c21
font_01_sfnt_off0001359e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1359E 16248 bytes
SHA-256: b82b54df0b44db98f1ddba5cd5c2585d51805a71af550f648b0e884aef62987a

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