Malicious PDF — malware analysis report

Static analysis result for SHA-256 ef40fde317c4ce4d…

MALICIOUS

PDF

71.9 KB Created: 2021-03-19 07:21:48 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 880bca8b23b4631aa454e31c210a6200 SHA-1: 5978b2040e540a20998cf7b7120641fd7026e1ef SHA-256: ef40fde317c4ce4d5116b4e907bc14698e197dfe42036b32533d31e13d1574df
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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 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.
  • 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://resalured.ru/123?utm_term=parts+of+the+declaration+of+independence+worksheet PDF link annotation
    • https://xemalijojododud.weebly.com/uploads/1/3/0/9/130969235/9716385.pdfIn PDF document text
    • https://xewurilarigifu.weebly.com/uploads/1/3/4/2/134236076/b67db868.pdfIn PDF document text
    • http://namunemalem.22web.org/burger_king_menu_prices_and_deals.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374545/normal_601128ccd61b0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4474750/normal_602f4138abfec.pdfIn PDF document text
    • https://wofixoxabovu.weebly.com/uploads/1/3/4/5/134524794/6d76f9239cda2.pdfIn PDF document text
    • https://fejenugid.weebly.com/uploads/1/3/4/0/134016750/wavorug-fuvudalis.pdfIn PDF document text
    • https://zolerowiz.weebly.com/uploads/1/3/4/6/134691656/womed_muwuwim.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4457868/normal_600dcd6fec6a0.pdfIn PDF document text
    • https://tevirilozarenov.weebly.com/uploads/1/3/2/6/132695732/mumixudexot_fidijiliba.pdfIn PDF document text
    • http://wupupetobuzune.22web.org/xesazo.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://kezepinaxozegom.epizy.com/10023912018.pdfIn PDF document text
    • https://s3.amazonaws.com/kevava/editable_cv_templates_free_docx.pdfIn PDF document text
    • https://s3.amazonaws.com/dutimajizowa/39087693837.pdfIn PDF document text
    • https://s3.amazonaws.com/gimisorixosu/bully_scholarship_math_5_answers.pdfIn PDF document text
    • http://fekepoloper.rf.gd/como_hacer_referencias_bibliograficas.pdfIn PDF document text
    • https://s3.amazonaws.com/dutimajizowa/how_to_make_table_design_in_excel.pdfIn PDF document text
    • https://s3.amazonaws.com/xonobijikivo/34564041391.pdfIn PDF document text
    • https://s3.amazonaws.com/fofeguj/kajunokiwubomi.pdfIn PDF document text
    • https://s3.amazonaws.com/ropuba/possessive_nouns_online_exercise.pdfIn PDF document text
    • http://vogumogut.epizy.com/52274008194.pdfIn PDF document text
    • https://s3.amazonaws.com/xakapudakadu/12304090428.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_off0000dc43.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC43 5400 bytes
SHA-256: c9ba33f3d197f84fa74b90ea8739c7b029e62931edda86656c64034c32649631
font_01_sfnt_off0000eead.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEAD 10376 bytes
SHA-256: 054093074d3ac8f1ab3af3080b89b2f8517e4bb077b66706fb87e68ead9bb66d

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