Malicious PDF — malware analysis report

Static analysis result for SHA-256 f8caede1eff0d72a…

MALICIOUS

PDF

85.5 KB Created: 2021-03-24 01:16:52 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 5ce10d7d8f25d8b9dee194983945e673 SHA-1: 3ec0f3ec7fbab0366be7a14ca523799c1c55c500 SHA-256: f8caede1eff0d72aa4865f14826de3c30deeff8e057b52e4c137cf26a2183ce7
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://vilenefex.ru/123?utm_term=google+play++pending+stuck PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4486190/normal_5ff4b112ab204.pdfIn PDF document text
    • https://cdn.sqhk.co/nobukomorur/Ogfhdih/capacity_building_training.pdfIn PDF document text
    • https://cdn.sqhk.co/kegufamop/afAibv8/latest_hashtags_for_instagram_2020.pdfIn PDF document text
    • https://linugotozoluj.weebly.com/uploads/1/3/4/6/134662393/7935686.pdfIn PDF document text
    • https://cdn.sqhk.co/vewimidipiv/Dibhsja/learn_python_programming_romano.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408184/normal_602dc76465b84.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4410986/normal_5fe998075fe84.pdfIn PDF document text
    • https://sokifavobal.weebly.com/uploads/1/3/4/5/134514189/desamubejez.pdfIn PDF document text
    • http://fibipowokogo.sportsontheweb.net/how_to_clean_filter_on_dyson_stick.pdfIn PDF document text
    • http://taxokijoba.sportsontheweb.net/vasaw.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4449602/normal_5fdb7f67d9eb4.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/a01fb79d-6abb-4235-8efb-d3ce688b5f53/73658637095.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f433d073-e49c-49da-a016-d1595ab9bb93/how_to_do_sampling_in_qualitative_research.pdfIn PDF document text
    • http://zamoguwudegovo.rf.gd/44512134187.pdfIn PDF document text
    • http://wobemiko.epizy.com/52413101400.pdfIn PDF document text
    • http://pilorivebapo.rf.gd/fluent_python_2nd.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7b94ed53-a599-48c0-a2ee-dd40409229fc/alto_shaam_halo_heat_750-s.pdfIn PDF document text
    • http://tazigedefabe.rf.gd/56175272793.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d5aa2294-00ed-4b89-8b77-4c1a4087a94d/best_maths_book_for_class_6_cbse.pdfIn PDF document text
    • http://duwemanuwixam.atwebpages.com/derrida_differance.pdfIn PDF document text
    • http://mavuriwowul.myartsonline.com/april_2020_monthly_current_affairs.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fb8a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB8A 5340 bytes
SHA-256: 746f11cdf48ecb65da95d66586934ec2dbccd04265b26eb435947452c468fc0a
font_01_sfnt_off00010de1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DE1 10948 bytes
SHA-256: 7ea49cb7e650b33d3e42a43a08fbb6eb3fb425856294c60ea953a16abdd6a2d1
font_02_sfnt_off0001335f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1335F 16092 bytes
SHA-256: ea75db71c9df7250347a03039f742fcd189f5fc3f08964e696816fa8b5227073

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