Malicious PDF — malware analysis report

Static analysis result for SHA-256 707c39f253213173…

MALICIOUS

PDF

68.8 KB Created: 2021-02-12 09:39:01 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-17
MD5: d6668507c5045ad3f14a8437769e29df SHA-1: b2588ed90b60e037a61108531bcc0a0c22b97bb3 SHA-256: 707c39f2532131739c9ffffe36e0d0cf91f5c632b1cfdf9efc9e5542f405c4fb
126 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing or trojan. The document body, though truncated, suggests a lure related to 'El conde lucanor answer key'. Numerous external URLs are embedded, many hosted on disposable domains, indicating a link farm or redirection scheme to deliver malicious content. The presence of PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports this, suggesting the PDF is designed to funnel users to various malicious sites.

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://jacksth.ru/123?utm_term=el+conde+lucanor+answer+key PDF link annotation
    • http://nesobaka9.xyz/ursa_mini_pro_user_manualtagg9.pdfIn PDF document text
    • https://cdn.sqhk.co/zubixola/h41fial/snowden_2016_full_movie.pdfIn PDF document text
    • https://watogovujun.weebly.com/uploads/1/3/4/6/134626060/beguxe.pdfIn PDF document text
    • http://sq11mini.com/lumberwhack_defend_the_wild_downloadd21de.pdfIn PDF document text
    • http://marafonsport.site/car_cube_crusherbyf93.pdfIn PDF document text
    • http://nakrutkavk.site/xexexogasagoginogo9u.pdfIn PDF document text
    • https://cdn.sqhk.co/mugapowejog/6icrjaX/casiopea_domino_line_bass_tab.pdfIn PDF document text
    • http://photoforce.ru/sozezoxijegkb0qa.pdfIn PDF document text
    • http://raffle.website/25747451735zdwj5.pdfIn PDF document text
    • https://bivufinemena.weebly.com/uploads/1/3/1/3/131380184/60d4ae3.pdfIn PDF document text
    • http://lnstagramverifycentre.com/36696787720tsvsq.pdfIn PDF document text
    • http://vorgazme.com/matuwazisolewphef.pdfIn PDF document text
    • http://osthondroz.com/listening_comprehension_test_with_answersjmqbb.pdfIn PDF document text
    • http://50offstore.pro/sample_spreadsheet_for_budgetud99c.pdfIn PDF document text
    • https://xoxopurotawasuj.weebly.com/uploads/1/3/4/6/134651309/pomitinizajug.pdfIn PDF document text
    • http://tactical-jacket-sale.shop/logarithms_laws_worksheetsr61f.pdfIn PDF document text
    • http://ig-copyrightviolation.com/8344355413lg9zb.pdfIn PDF document text
    • http://spencermcman.us/829817324640xkou.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/jupoti/7315950271.pdfIn PDF document text
    • https://s3.amazonaws.com/xezujuxoz/argox_cp_2140_barcode_printer_driver.pdfIn PDF document text
    • https://s3.amazonaws.com/kugelilizibuwum/clcss_guidelines_2019.pdfIn PDF document text
    • https://s3.amazonaws.com/lunojol/backup_android_contacts_to_pc_free.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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d06a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD06A 5148 bytes
SHA-256: 7471d9401f3db178e493774298b18ed78015a73b1ee69a3ab8a4f7bce7d5348e
font_01_sfnt_off0000e215.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE215 10520 bytes
SHA-256: 7c0c94dfae0a5a097b8849223802ae4cc66afd1472673c8812eec02a36199456

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