Malicious PDF — malware analysis report

Static analysis result for SHA-256 aec30bff39d73ecf…

MALICIOUS

PDF

86.3 KB Created: 2021-03-23 22:40:26 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ae1ee85e3a206f9e947876bf782daaca SHA-1: 73f12c91fd71730a728a36dae42fa192e34c76ea SHA-256: aec30bff39d73ecf63d601cdb6b75e58c0e3a5a0b61f3c52e2380e4dc2737a9e
126 Risk Score

Malware Insights

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

The PDF file contains heuristics indicating it is a link farm and has been flagged by ML classifiers and ClamAV as malicious phishing content. The embedded URL leads to a domain associated with malicious activity, likely to deliver a phishing page or further malware. Although no scripts were explicitly extracted, the PDF structure and embedded URI suggest an attempt to redirect the user to a malicious site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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://vilenefex.ru/award?keyword=usos+medicinales+del+bicarbonato+de+sodio+pdf
    • https://cdn.sqhk.co/jedelamodafa/Qgdiit3/wexukis.pdf
    • http://lakujalinifibo.mypressonline.com/78102308359.pdf
    • https://cdn.sqhk.co/julukiporo/cgAjaDk/quotation_email_template.pdf
    • http://bumawusuka.mypressonline.com/ielts_reading_answer_sheet.pdf
    • https://cdn.sqhk.co/xaduwudixum/gexqghi/15475252766.pdf
    • http://tamodemuror.getenjoyment.net/2008_jeep_wrangler_unlimited_x_reviews.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://1c684d3d-b1aa-4d58-8f8e-408f9cf37fac.filesusr.com/ugd/64d889_db5ae29cdbe744198d7faf4417065e42.pdf?index=true
    • http://satawakerexe.atwebpages.com/booting_process_of_windows_7_step_by_step.pdf
    • https://6cdf8c5e-36a0-4b6d-987f-32d3d50030cd.filesusr.com/ugd/3c2e2e_e6864d2885fb4d8599d2ae86fb589cb0.pdf?index=true
    • https://s3.amazonaws.com/sinadi/babylon_don_mclean_sheet_music.pdf
    • https://uploads.strikinglycdn.com/files/370cfd93-d61a-46b3-8bcc-b86260cbb173/naxezarof.pdf
    • http://wegamaluperetuj.atwebpages.com/vocabulary_words_for_high_school.pdf
    • https://4abf464d-34d5-4c80-8de5-e64f30e04530.filesusr.com/ugd/8b3eb5_428f1d6ddbb44d9a89eb33bd9080213e.pdf?index=true
    • https://s3.amazonaws.com/dowesitobuga/72947933649.pdf
    • https://s3.amazonaws.com/loxopudizus/jumping_spider_bite_side_effects.pdf
    • http://zikoliduxa.atwebpages.com/population_genetics_and_evolution.pdf
    • http://bokawevetejap.atwebpages.com/bokijasajanamikovo.pdf
    • https://s3.amazonaws.com/petikamov/67185679280.pdf
    • https://56a79910-2d97-40e4-a1df-bca3b17021d7.filesusr.com/ugd/2721fc_f9375f40a79549dda1b901023a618a9a.pdf?index=true
    • https://128fc002-9ed4-4a8f-9a6b-83b43563a9ed.filesusr.com/ugd/6812d7_9682a97231b949acbf71310c693a59a9.pdf?index=true
    • https://uploads.strikinglycdn.com/files/e24a7490-bc4e-4efb-b739-ebe2c6294233/is_there_an_official_samsung_tv_remote_app.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
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ee1e.bin
73dd9c73d70c4eae49209926cfbcad709e81070907ea131932e6071f865bf997		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEE1E 5220 bytes
font_01_sfnt_off0000ffb1.bin
9b5819604d03637a35f6a08423756232e238bfb44a9e703587c241ef3121776a		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFFB1 11764 bytes
font_02_sfnt_off00012610.bin
6ae61237400d33412f60a3aa131962030608fd104cae84d4ea987596d4ae31e2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12610 16196 bytes
font_03_sfnt_off00013b3e.bin
4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13B3E 4324 bytes

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