Malicious PDF — malware analysis report

Static analysis result for SHA-256 a6fef91c27b1826f…

MALICIOUS

PDF

85.6 KB Created: 2021-05-17 14:25:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: ae01bac3688ea92255d2c37374315b95 SHA-1: 5306a5b8343a45b9b726e6afafd7595ccde42372 SHA-256: a6fef91c27b1826f1d6b56fdcafbf1427128714ff340ff21bf491afc30df8c95
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

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 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://jumiwimov.ru/strik?utm_term=uncovering+student+ideas+in+science PDF link annotation
    • https://xuwupeloz.weebly.com/uploads/1/3/4/7/134734270/woter_vujemavobomoze.pdfIn PDF document text
    • http://bitalotava.scienceontheweb.net/lirufogekaranoke.pdfIn PDF document text
    • https://lovefuzabuzonif.weebly.com/uploads/1/3/4/1/134109130/vulenanavi_xijosurog_fenekegepalifim_fefizi.pdfIn PDF document text
    • https://wevumofanefaso.weebly.com/uploads/1/3/5/9/135964816/befopeloburap.pdfIn PDF document text
    • http://ninuxalezopo.getenjoyment.net/21735819918.pdfIn PDF document text
    • http://baxusajatos.sportsontheweb.net/app_to_highlight_on_ipad_free.pdfIn PDF document text
    • http://kosamaritaj.getenjoyment.net/atex_directive_1999_92_ec.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://0c1adbbe-b65a-4c28-9da2-87cea21e0636.filesusr.com/ugd/496951_9011f862c109426ab8296f1ba12e2793.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/fa3f717a-18c3-4cf4-a86a-02389d6067ba/65015329721.pdfIn PDF document text
    • https://s3.amazonaws.com/polojuliragam/naraze.pdfIn PDF document text
    • http://mumunetade.epizy.com/words_that_rhyme_with_smile_yahoo_answers.pdfIn PDF document text
    • http://guwitus.epizy.com/37757680339.pdfIn PDF document text
    • https://s3.amazonaws.com/leteraxewe/dadux.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5c1b3486-ff8e-4ae5-a848-c2cb45c7d628/clasificacion_de_los_titulos_de_credito_por_su_forma_de_circulacion.pdfIn PDF document text
    • https://s3.amazonaws.com/winumigutam/98125165628.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f36dbb62-f18f-43f9-8707-51977a6cd0ae/what_is_the_magnitude_of_the_net_force_on_q.pdfIn PDF document text
    • https://s3.amazonaws.com/lupebesu/hermit_lite_apps_browser_apkpure.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/59c3c033-b79c-4acb-b69b-eca11f1437f3/faluxafigefipulegovugesa.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e6ac44e7-729d-49a2-af6e-9ddce57e2542/negotaz.pdfIn PDF document text
    • https://2f60c0de-bae8-48d8-8f3f-ce7907f87c52.filesusr.com/ugd/badafb_7a2889867dc348c59384e8ad130d694c.pdf?index=trueIn PDF document text
    • https://393102e6-89af-4738-8cad-89662dba8dc5.filesusr.com/ugd/33a16d_48e77bca4c5b4397831f062bf38522a0.pdf?index=trueIn 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000104d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104D0 5008 bytes
SHA-256: a296ab8e352f94101bda0c36a2cb2d91522257842d2ba538742292b8b27c9809
font_01_sfnt_off000115e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x115E7 10740 bytes
SHA-256: eef694b2a876cf04a201bfede757b0eb1dc94bea493dd2add852d888beaa8dc5
font_02_sfnt_off00013a9e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13A9E 4324 bytes
SHA-256: 05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176

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