Malicious PDF — malware analysis report

Static analysis result for SHA-256 720c48ecce842137…

MALICIOUS

PDF

67.0 KB Created: 2021-03-23 05:54:32 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 5cc0b609103722e0bcf32e3858ed4aa2 SHA-1: 20f8d4472f918c56a79ba69fc49acd48670b04de SHA-256: 720c48ecce8421377aebaadfcd39829c3453fcd59cfcc2ef09ed2200bd5fd4e6
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 0.9998

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=inside+reading+1+second+edition+answer+key PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4413838/normal_5ffcbf6c65512.pdfIn PDF document text
    • http://evromotors.net/tujofuxutumutimoqszw0.pdfIn PDF document text
    • http://importants.space/cyberghost_5_crack1dilz.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369185/normal_602de48ee3626.pdfIn PDF document text
    • http://paselon.getenjoyment.net/libro_de_ingles_basico_de_augusto_ghio.pdfIn PDF document text
    • http://cupe1.ru/46107966700se3p8.pdfIn PDF document text
    • http://tryporte.xyz/bosebogimuvabov58dpe.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4418788/normal_5fe2b01be4e49.pdfIn PDF document text
    • http://tomandbxof.site/who_took_christianity_to_africasdu2s.pdfIn PDF document text
    • http://nowtorrentz.com/kizurikanunuxejigonuludoz68w5.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/ecc595d4-015d-40a7-b543-f3c2091c02a0/gawefusasejazulakara.pdfIn PDF document text
    • http://wuwedilejom.myartsonline.com/brunner_and_suddarth_14th.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/dd9ce694-6898-42d4-af3c-b78f0d5d7d59/ipod_nano_6th_generation_charging_cable.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d1e78ebd-aaa0-4218-8866-cded374b17f9/english_idioms_with_meanings_in_hindi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0ba2f035-4b7e-4304-a289-16b6c8f877dd/how_long_will_a_whirlpool_refrigerator_last.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/467c1c5d-b92f-4cb9-975e-5b3bfc48382a/how_do_i_change_my_scansnap_settings.pdfIn PDF document text
    • http://xobebol.onlinewebshop.net/scag_tiger_cat_2_reviews.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ddb12b77-b3ba-430c-81ef-7b9883dd093e/what_does_lsc_stand_for.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_off0000caa8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCAA8 5324 bytes
SHA-256: c6e4ed55cf8486d7b8c58b74c90373b2d9bbf9a52d9b796ed0316a61331c50c5
font_01_sfnt_off0000dcef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCEF 9916 bytes
SHA-256: 197090e3bcd909502b378452cda1756a0504853333fa21b844df6f262fe8af84

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