Malicious PDF — malware analysis report

Static analysis result for SHA-256 e446cb5764190051…

MALICIOUS

PDF

66.6 KB Created: 2021-02-10 16:41:38 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-07
MD5: 82f7096e70d90b473f68e2040807941c SHA-1: 62ca5947f0e1620697591352d534b73ad3b5c9ff SHA-256: e446cb576419005172b152054c5ab7363ebc4b023854cdcf83155210d2cada6f
126 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, with at least one pointing to a link farm on disposable hosting, suggesting an attempt to redirect users to malicious sites. The document body, though heavily obfuscated, contains text related to 'ethos pathos logos worksheet middle school' and is generated by wkhtmltopdf, indicating a potential lure.

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
  • 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://maypoin.ru/aws?utm_term=ethos+pathos+logos+worksheet+middle+school PDF link annotation
    • https://pazovazorukilaz.weebly.com/uploads/1/3/4/6/134673506/nodagetetun-donon-xewewa-fumijexerel.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4425235/normal_600fd95560ec8.pdfIn PDF document text
    • https://xoxopazivufa.weebly.com/uploads/1/3/5/3/135398299/310356.pdfIn PDF document text
    • http://zinobinipote.22web.org/farazipabosoveg.pdfIn PDF document text
    • https://verevivomilob.weebly.com/uploads/1/3/0/7/130738769/daxoxelibabes.pdfIn PDF document text
    • https://jagotizepevex.weebly.com/uploads/1/3/4/4/134464701/tedemi.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4408711/normal_6009a361bd398.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/pubopelej/61645613087.pdfIn PDF document text
    • https://s3.amazonaws.com/xaliwalufoguni/videos_de_manualidades_en_fieltro_para_navidad.pdfIn PDF document text
    • https://s3.amazonaws.com/wozowuledij/brochure_templates_free_google_docs.pdfIn PDF document text
    • https://s3.amazonaws.com/somamere/bobolami.pdfIn PDF document text
    • http://www.readwritethink.org/classroom-resources/lesson-plans/persuasive-techniques-advertising-116In 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_off0000c8ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC8EF 5600 bytes
SHA-256: d73542ebcfccc6f3717037b53abc0617f9ef2831d6a4d1de991d468366c37a27
font_01_sfnt_off0000dbe2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBE2 9948 bytes
SHA-256: 00255d061401a7e26a3117aaae457f2ef6d76972c75d7cfdb49481ac04b8d405

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