Malicious PDF — malware analysis report

Static analysis result for SHA-256 97155cf217dc206f…

MALICIOUS

PDF

72.7 KB Created: 2021-03-02 16:42:03 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: e1d5548d157003c67f3e3463f9eddd9e SHA-1: 8d3861862b1df149e64f2d7789462aaf7e138b48 SHA-256: 97155cf217dc206f24dfe7e32a73adc797f67d7c9ce4c3b8282ebe6e15e505c3
104 Risk Score

Malware Insights

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

The PDF contains numerous external links, with a critical heuristic identifying a link farm. One prominent URL, https://jumiwimov.ru/strik?utm_term=how+to+defrost+the+samsung+ice+maker, is presented in the document body, suggesting a lure to a malicious site. The ML classifier strongly indicates maliciousness, and the presence of many external links points towards an attempt to redirect the user to a compromised or malicious resource.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://jumiwimov.ru/strik?utm_term=how+to+defrost+the+samsung+ice+maker PDF link annotation
    • http://excschool.ru/51223521048v5yjt.pdfIn PDF document text
    • https://ruvedusipokowu.weebly.com/uploads/1/3/0/8/130813644/tavupikegipowaro.pdfIn PDF document text
    • https://pirulilepeno.weebly.com/uploads/1/3/4/0/134040853/vikuxajom.pdfIn PDF document text
    • http://zinularurupokim.iblogger.org/loririgedavukenimo.pdfIn PDF document text
    • http://kprovk.xyz/planetside_2_wiki_vehiclesviugf.pdfIn PDF document text
    • http://formverifiedbadge.com/first_alert_smoke_and_carbon_monoxide_alarm_error_messageermob.pdfIn PDF document text
    • https://duvozogol.weebly.com/uploads/1/3/5/3/135314926/3d13a646896d62.pdfIn PDF document text
    • https://pebufaso.weebly.com/uploads/1/3/5/4/135400671/gozomil.pdfIn PDF document text
    • http://kersita.fun/ionic_breeze_quadra_s1737_manualikgtw.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://diponolen.rf.gd/chibi_moon_transformation_gif.pdfIn PDF document text
    • https://s3.amazonaws.com/mejobu/59712713496.pdfIn PDF document text
    • http://kitomov.epizy.com/asus_ac68u_router_mode.pdfIn PDF document text
    • https://s3.amazonaws.com/pisedij/54279577874.pdfIn PDF document text
    • https://s3.amazonaws.com/wekibik/cramerton_nc_police_accident_reports.pdfIn PDF document text
    • https://s3.amazonaws.com/zuwosil/53172202591.pdfIn PDF document text
    • https://s3.amazonaws.com/rovikibixu/gopofowadu.pdfIn PDF document text
    • http://namajuve.epizy.com/instagram_update_for_android_4._0.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_off0000dea6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEA6 5520 bytes
SHA-256: bc47baaff61d456181e4835b5db1e3da714a9da09c342932824b96408da7a9f5
font_01_sfnt_off0000f159.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF159 10684 bytes
SHA-256: 8ce89c127ded420bc783cfda918145b56a7cda2d5cdcc0d5d3ee0adf0d9dfd35

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