Malicious PDF — malware analysis report

Static analysis result for SHA-256 5c6b1e33ae6000e0…

MALICIOUS

PDF

68.7 KB Created: 2021-03-18 03:42:14 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: d7279305a6f45ea354009602f8d78ae2 SHA-1: 10aa84d2b85d8974aaeeabf7e38e22bd0eac9cc0 SHA-256: 5c6b1e33ae6000e0ac7b488cd3bfe7a874e2c0a04ad265d0c68734954b0b712b
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

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 6

  • 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 contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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://golowaki.ru/123?utm_term=synonym+and+antonym+worksheet+for+grade+5 PDF link annotation
    • http://pakirekugep.scienceontheweb.net/put_on_the_full_armor_of_god_song.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4500679/normal_5fc8888b1bc42.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4481270/normal_6008b8989658c.pdfIn PDF document text
    • http://tezuveripoxub.mypressonline.com/dungeons_and_dragons_download.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4486045/normal_60319146847c1.pdfIn PDF document text
    • http://zujoxuxosaja.getenjoyment.net/xapajovije.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/52c1f598-80a0-4e32-ab3c-86d6174b3c10/56957961457.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bd778e74-d6ae-49d0-a449-7bf3194b9764/what_are_the_7_stages_of_human_development.pdfIn PDF document text
    • https://dc58184e-bbba-402a-8e08-a55d552c8f3f.filesusr.com/ugd/0ebc1f_ec6693587df84e1b9e565bd0c5f5eac7.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/983c778a-5b61-45a2-a312-f50c716d49df/hp_probook_4530s_core_i5_release_date.pdfIn PDF document text
    • https://s3.amazonaws.com/jarirotexab/69322076620.pdfIn PDF document text
    • https://s3.amazonaws.com/tokatefozude/background_remover_photoshop_action_free.pdfIn PDF document text
    • https://f9c81679-ddb1-4746-ab40-32673edc426c.filesusr.com/ugd/2eff39_040d863c471048d3ad5823c19f08525a.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/5d0429b4-842e-4ad2-b3cd-d63425a7ed05/8788477523.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/417d6b1c-629e-4d3f-b730-e78a5ef7d45b/56211438365.pdfIn PDF document text
    • https://d5e9a058-cbdc-4968-ba72-30cdbf1e36a3.filesusr.com/ugd/9cfd0a_51591db6b0a14664bcfb96db4bb0f892.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/wazorixekunafob/debate_games_and_activities_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/vinivuxo/cash_drawer_till_sheet.pdfIn PDF document text
    • https://s3.amazonaws.com/gavobawum/is_there_going_to_be_a_sequel_to_doom_annihilation.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_off0000ce84.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE84 5776 bytes
SHA-256: 7de356c6b4d1932d314f132ca4a7b8b22df83b44bcf6957853be45892a880c1a
font_01_sfnt_off0000e220.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE220 10212 bytes
SHA-256: 20e70b609bcd7fc56140b53841e76971ef6a8c8c95fcbdcc72e46007a37bc568

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