Malicious PDF — malware analysis report

Static analysis result for SHA-256 d7a5a7bac3b7f861…

MALICIOUS

PDF

78.6 KB Created: 2021-04-30 22:19:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: ddfa550a1cd3d31119f84250e40b37bb SHA-1: feaaeaf0ea44d320e9325d05dc343c72fa2abc02 SHA-256: d7a5a7bac3b7f861af3ee7829e92f8a34c705d59527783d5c65e4825832a8fea
126 Risk Score

Malware Insights

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

The PDF contains multiple embedded URLs pointing to suspicious domains, and heuristic analysis indicates it functions as a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware delivery. Although no scripts were explicitly extracted, the PDF structure and embedded links are indicative of an attempt to redirect the user to malicious 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 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://botokaw.ru/strik?utm_term=how+to+rapid+test+covid PDF link annotation
    • http://sozetil.66ghz.com/30447965915.pdfIn PDF document text
    • http://lovechat24.club/walutafinejikozux0sb3z.pdfIn PDF document text
    • http://winoorama.website/63181353945i9dxn.pdfIn PDF document text
    • http://airned.ru/80695461974pj3nn.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4380694/normal_5fff76b7551cc.pdfIn PDF document text
    • http://am-sound.ru/when_breath_becomes_air_audiobook_youtuberhqmc.pdfIn PDF document text
    • http://itclick.pro/creative_writing_download5rkow.pdfIn PDF document text
    • http://floradoma.net/gadetigapagasenassqyq3.pdfIn PDF document text
    • http://tokio-2020.fun/wosomop93f81.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4476453/normal_5fd8af5f08af3.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://lesexugisitu.rf.gd/fokeweradapulojimenu.pdfIn PDF document text
    • https://35e1cc1d-5f6c-4a41-9b1b-b9ae8dddc97a.filesusr.com/ugd/351eee_99c7ba3462744dcaacb4df9c91214c16.pdf?index=trueIn PDF document text
    • https://9d50af6f-dbf7-41ba-b854-83985329a12b.filesusr.com/ugd/33c377_55656c94c59c4f98bde949eb1f06788a.pdf?index=trueIn PDF document text
    • https://11627308-8c8f-4f08-99ed-0ad85160907d.filesusr.com/ugd/682d1c_364249f6ce2b4b40a9368500ebea35b2.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/gezizefefififa/buzirobijizazo.pdfIn PDF document text
    • http://xuvelenidoxi.rf.gd/sejarah_agama_kristen_protestan_di_indonesia.pdfIn PDF document text
    • https://s3.amazonaws.com/polojuliragam/57616344912.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_off0000f5e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5E6 5148 bytes
SHA-256: cf858ea1c0aa0764cc60dcaad4a3f5321bc8c2b013c2291044759764c558f9e1
font_01_sfnt_off0001078b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1078B 11036 bytes
SHA-256: 38448f6321df522cf8376a21da4e635538aa02c70922f8cfe9c061df8a735fcb

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