Malicious PDF — malware analysis report

Static analysis result for SHA-256 946633bf909a9287…

MALICIOUS

PDF

76.4 KB Created: 2021-03-15 22:22:51 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 9df17a9c74196349707e4ddeb1eeb4fa SHA-1: 5ee9be29d1954211c8163884941f6d3bee35a65e SHA-256: 946633bf909a92879c339c8590ca2dcce2b7b3c96b91c2e0b2829b044a89b146
156 Risk Score

Malware Insights

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

The PDF contains a significant number of external links, identified as a PDF link farm. The ClamAV detection and ML classifier strongly indicate malicious intent, specifically phishing. While no scripts were explicitly extracted, the PDF structure and extensive external linking suggest it's designed to redirect users to potentially malicious sites, possibly for credential harvesting or malware distribution.

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://crophysi.ru/aws?utm_term=2012+jeep+grand+cherokee+laredo+starter+issues
    • https://cdn.sqhk.co/zepipawetopi/dQeGkHQ/31281057972.pdf
    • http://burivuvuju.medianewsonline.com/how_many_books_are_in_the_5_kingdoms_series.pdf
    • https://cdn.sqhk.co/devisofage/icge7GI/download_apk_cafe_panic_cooking_restaurant.pdf
    • http://jurojegame.getenjoyment.net/69964021474.pdf
    • https://cdn.sqhk.co/suvotoruwot/ALygeJM/letter_g_worksheet_preschool.pdf
    • https://static.s123-cdn-static.com/uploads/4372721/normal_5fc9f86d5a012.pdf
    • http://rawiduti.medianewsonline.com/is_stock_market_open_on_veterans_day.pdf
    • https://cdn-cms.f-static.net/uploads/4478146/normal_5fdc1fb4a8f38.pdf
    • https://cdn.sqhk.co/fisoxinizo/Yrs6kjf/kutopipejosoxizagabize.pdf
    • http://gakawisogafuga.mygamesonline.org/vimukutuwitizenevep.pdf
    • https://cdn.sqhk.co/gabadifofibo/cCjc6jd/geometry_worksheet_6._2_parallelograms_answers.pdf
    • https://cdn-cms.f-static.net/uploads/4411218/normal_601eb8dd81660.pdf
    • https://static.s123-cdn-static.com/uploads/4490265/normal_5fc8ceebcbd42.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://3e1af3dc-cf37-4f58-935d-0a6065bc5ce9.filesusr.com/ugd/3ca236_4e705743b39549df8505709027c01ef2.pdf?index=true
    • https://s3.amazonaws.com/tuxutedi/47091494643.pdf
    • http://luvabokinoleg.onlinewebshop.net/who_is_the_best_portrait_painter.pdf
    • https://s3.amazonaws.com/jenisozazewubo/football_themed_powerpoint_template_free.pdf
    • http://bukogog.epizy.com/uscg_auxiliary_form_7003.pdf
    • https://39c1d623-eccb-4af0-a86a-15328a2d61f9.filesusr.com/ugd/3cb6cb_fb8abb0f0ef14577b012c598dadc8ea1.pdf?index=true
    • https://s3.amazonaws.com/dozuga/4542535736.pdf
    • http://kunamemel.epizy.com/60982705234.pdf
    • https://s3.amazonaws.com/kosamupim/sewefaxagepajori.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_off0000ec83.bin
bef75c5cd586d995523b69f63e90b5e0fb92cff9163f6eb04f69e9cdcf7ce957		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEC83 5704 bytes
font_01_sfnt_off0000fff3.bin
bc61a0ada709324427857b59b48e251bdcb939147e18e7f6c01a61f7dd66a7f5		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFFF3 10508 bytes

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