Malicious PDF — malware analysis report

Static analysis result for SHA-256 ee442ba60d9c5c82…

MALICIOUS

PDF

85.9 KB Created: 2021-03-10 08:38:59 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: cd8e8186da7a05935a39228a9ceb8903 SHA-1: 26f6cfd6eea20404b761179f13ebc1c59d523640 SHA-256: ee442ba60d9c5c82814447e05a500f5c431e1c0abb0cbd4b973442ec2d34ddbe
156 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a phishing or trojan payload. The document contains a large number of external links, many of which are likely part of a link farm designed to improve search engine rankings, but one specific URL, https://vilenefex.ru/wix?keyword=independent+and+dependent+events+worksheet+7th+grade, is directly embedded and appears to be the primary lure. No scripts were extracted, but the PDF structure and numerous external links suggest it's designed to redirect the user to a malicious site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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 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://vilenefex.ru/wix?keyword=independent+and+dependent+events+worksheet+7th+grade PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4402261/normal_6029cde224212.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408184/normal_5fe8e7b2b9389.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4497695/normal_5fe127b788e7d.pdfIn PDF document text
    • http://luminar2-download.xyz/allcast_premium_apk_1._0._0._7uvddq.pdfIn PDF document text
    • http://aycotoro5.xyz/86398557489enjot.pdfIn PDF document text
    • http://prodson.fun/dikinasunupasapesutaxs7a.pdfIn PDF document text
    • http://filanion.online/379556383998krau.pdfIn PDF document text
    • http://nifazafagikoxa.medianewsonline.com/what_is_national_and_per_capita_income.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4458122/normal_5ff3bfc545702.pdfIn PDF document text
    • http://zodatowafe.getenjoyment.net/dream_interpretation_dog_bite_arm.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://koxolavomuzo.myartsonline.com/autumn_leaves_walking_bass_piano.pdfIn PDF document text
    • https://s3.amazonaws.com/vatosolikijike/android_auto_bmw_g20.pdfIn PDF document text
    • https://ac263381-fdad-4fda-ae78-6df6d71032d6.filesusr.com/ugd/25c42e_2e1861cac099451a84bfec82cd6e455a.pdf?index=trueIn PDF document text
    • https://9cf93ecd-64ee-4ad6-afcc-f350577a7522.filesusr.com/ugd/c4dbd3_ec59a2e3c7be45e3984b3cfb81ab15f3.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/bitajemisajoz/kejetimoxujuzog.pdfIn PDF document text
    • https://s3.amazonaws.com/baposivarabuj/sports_channel_live_tv.pdfIn PDF document text
    • https://s3.amazonaws.com/babetafaperaxov/gobasigudesunedumov.pdfIn PDF document text
    • http://jibimom.myartsonline.com/how_to_evaluate_pictures.pdfIn PDF document text
    • http://jumepenitujox.atwebpages.com/philips_norelco_bodygroom_series_7000_canada.pdfIn PDF document text
    • https://s3.amazonaws.com/boxujetanonikuv/google_sheets_home_budget_template.pdfIn PDF document text
    • https://s3.amazonaws.com/tadevewuju/clear_corrugated_perspex_roofing_sheets.pdfIn PDF document text
    • https://s3.amazonaws.com/wuniku/carlill_vs_carbolic_smoke_ball.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fd94.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD94 5420 bytes
SHA-256: e92e959ce076b2374b4ad89b20c183eefffdd8d7c6596084bd12e053c6c22445
font_01_sfnt_off00011023.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11023 10644 bytes
SHA-256: be19f29fc85359b58bf24d8f5fff3191644ae6908c44fd331279fb17b03522e6
font_02_sfnt_off000134c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x134C9 16112 bytes
SHA-256: 275d0ef8f619a30f75d5b67021c85ffe51dbf44d82a44ecb2d07128ff93f9399

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