Malicious PDF — malware analysis report

Static analysis result for SHA-256 20c3d9bb4787982d…

MALICIOUS

PDF

74.0 KB Created: 2021-02-27 10:04:05 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 69315b40244e934d446ab0bada346297 SHA-1: dbce890afcfc3152ee2ab2d0fcca1d9dd687b8f5 SHA-256: 20c3d9bb4787982d4ccad7f4e418f95c276bcc0ef97721ed683183e51dd70fcf
126 Risk Score

Malware Insights

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

The PDF contains an embedded URI pointing to a suspicious domain, identified as a link farm on disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URLs suggest it's designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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
  • 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://midufefew.ru/wix?keyword=saludos+y+despedidas+in+spanish PDF link annotation
    • https://nowagomasililub.weebly.com/uploads/1/3/0/7/130775830/6713832.pdfIn PDF document text
    • https://jezulusawuse.weebly.com/uploads/1/3/4/0/134000263/lelurekukom-nawatokofedema.pdfIn PDF document text
    • http://wanasuj.22web.org/23096601975.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4388276/normal_6032024629a89.pdfIn PDF document text
    • https://mamasikixatok.weebly.com/uploads/1/3/5/9/135961158/nusiwo.pdfIn PDF document text
    • http://mafonofolifeda.22web.org/kuralupub.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4417207/normal_5ffab03b3a5cc.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/dobikasukavu/article_format_cbse_10.pdfIn PDF document text
    • http://fuvuxeren.epizy.com/mojameda.pdfIn PDF document text
    • http://tavawefojob.epizy.com/types_of_tax_incentives.pdfIn PDF document text
    • http://tereralubo.epizy.com/47124780898.pdfIn PDF document text
    • http://paxovabaresubal.rf.gd/nizita.pdfIn PDF document text
    • http://pititonekeget.epizy.com/teletovapowowalipezaku.pdfIn PDF document text
    • https://s3.amazonaws.com/zodawanuror/sour_grapes_documentary.pdfIn PDF document text
    • https://s3.amazonaws.com/tutasujal/time_word_problems_year_4_worksheets.pdfIn PDF document text
    • http://vofofoduwegakuv.rf.gd/sowozazosapesewipoxotaviw.pdfIn PDF document text
    • https://s3.amazonaws.com/gogoxowiniza/79921535866.pdfIn PDF document text
    • http://vateden.epizy.com/zixirenifozen.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_off0000e0fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0FA 5156 bytes
SHA-256: def9a3af3852a6fc9457b503abcdf0f7132df794283a79e711173b26a6f9078d
font_01_sfnt_off0000f285.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF285 11884 bytes
SHA-256: 554ccea3603a50001c936c5884557ec882e018b6ded96c0a5806d6fffab6234c

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