Malicious PDF — malware analysis report

Static analysis result for SHA-256 aeee24fe70da9871…

MALICIOUS

PDF

70.1 KB Created: 2021-04-05 12:09:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f8c15df0e34aa018408bc4ae4385f14d SHA-1: 756dbca23e4fc50c954693c8a78b7d345cf449fd SHA-256: aeee24fe70da9871d7ecafb91e014d40d9ec7a52d9809add90863afd2493cc6a
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which are SEO-optimized to appear as legitimate resources, indicating a link farm or phishing lure. The ClamAV detection and ML classifier strongly suggest malicious intent. Although no scripts were explicitly extracted, the PDF structure and heuristic firings point towards a malicious document designed to redirect users to potentially harmful websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://zajinet.ru/wix?keyword=omega+ruby+guide+pdf
    • http://lokubakodo.getenjoyment.net/affairs_cloud_computer_quiz.pdf
    • https://static.s123-cdn-static.com/uploads/4530868/normal_600046010e0f5.pdf
    • https://static.s123-cdn-static.com/uploads/4465403/normal_5feb9ede8b192.pdf
    • https://pedulexonevexo.weebly.com/uploads/1/3/0/7/130740508/rozixisunu.pdf
    • https://mozubuwuvufizo.weebly.com/uploads/1/3/4/6/134600540/xuwedilafixun-sozukulemo-tipenemenejewuk.pdf
    • https://cdn-cms.f-static.net/uploads/4453105/normal_60432f1d292de.pdf
    • https://cdn-cms.f-static.net/uploads/4409614/normal_605058bdf012d.pdf
    • https://xizonadap.weebly.com/uploads/1/3/5/3/135326441/252112.pdf
    • https://nixitemolepof.weebly.com/uploads/1/3/4/8/134870129/gixowubazopep.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://gagolabirej.atwebpages.com/lok_sabha_election_date_2020.pdf
    • https://s3.amazonaws.com/wezukep/wedinibom.pdf
    • https://s3.amazonaws.com/genijusemu/dojopozujefejo.pdf
    • https://s3.amazonaws.com/dowavelaxam/biodata_for_muslim_marriage_template.pdf
    • https://s3.amazonaws.com/mudurixo/29885802902.pdf
    • https://2559d30b-64cd-4b4d-aaad-e76a675dde99.filesusr.com/ugd/f5a024_24666d021eb44da9a9bce2c955ffa0ee.pdf?index=true
    • https://s3.amazonaws.com/nitidadufetenu/22356066373.pdf
    • http://zexaxekiki.atwebpages.com/alguien_esta_mintiendo_espaol.pdf
    • https://89d37d93-eaf9-4fc7-8d5e-07438b8f18e7.filesusr.com/ugd/e80f4c_4613a8513f304950834b6b0a72e68674.pdf?index=true
    • https://s3.amazonaws.com/tuxenipup/gegimekule.pdf
    • http://nubibubimalepik.atwebpages.com/broiler_farming.pdf
    • https://ac3db616-04cb-40f1-8357-c67041f5e20c.filesusr.com/ugd/eda9ba_513aab92bfa047c3b278b06320df1e26.pdf?index=true
    • https://s3.amazonaws.com/gekojulog/mic_not_working_on_laptop_windows_7.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d3da.bin
d8cfe646c7962f45cee50689c6159731d8e644bf592122c67f842650d28b8618		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD3DA 5420 bytes
font_01_sfnt_off0000e631.bin
7910061903aa4668937d71f9b514cdaebcac1124c17d3f82f63714c59419f742		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE631 10944 bytes

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