Malicious PDF — malware analysis report

Static analysis result for SHA-256 130066eb79114fcd…

MALICIOUS

PDF

70.9 KB Created: 2020-11-21 07:49:16 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: f60235ddb9e644a834ba2b9b51f8652e SHA-1: 1bd15fb648796477aa7c8b3d6cfd4c2830b290ce SHA-256: 130066eb79114fcd806efed520f67dffe57acef45bac4f0c550b2093dc0c8918
214 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, with several pointing to known malicious redirectors or link farms. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or SEO spam campaigns. Although no scripts were explicitly extracted, the PDF structure and embedded URLs suggest it's designed to redirect users to potentially harmful content.

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://gettraff.ru/123?utm_term=translations+math+worksheet In PDF document text
    • https://malalufapavi.weebly.com/uploads/1/3/4/4/134481779/boxozale.pdfIn PDF document text
    • https://figotuzu.weebly.com/uploads/1/3/4/5/134579221/puxanux_sebutivub.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379369/normal_5f96e245d24bd.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4377662/normal_5fa1b2246b17d.pdfIn PDF document text
    • https://polaposegit.weebly.com/uploads/1/3/4/5/134591324/5de5f921.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/tadovu/vaderupofuxiwipafor.pdfIn PDF document text
    • https://s3.amazonaws.com/tinajabizoreguf/simple_english_words_with_hindi_meaning.pdfIn PDF document text
    • https://s3.amazonaws.com/jarawaxanivu/35430046153.pdfIn PDF document text
    • https://s3.amazonaws.com/patotale/85985046309.pdfIn PDF document text
    • https://s3.amazonaws.com/jiwisi/joxapituwevaromezujofu.pdfIn PDF document text
    • https://s3.amazonaws.com/dogazisuze/misdemeanor_background_check.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_off0000d7c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7C3 5032 bytes
SHA-256: a57b12a1e3950a00583b9f08d0bfdf4a3e197e6f4e02dfd69e1fce3e34f16048
font_01_sfnt_off0000e8bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8BC 11060 bytes
SHA-256: 93d468473b43522fac1c88a5e29c78e8c822b5f834bbc7151fd7cd65208c770a

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