Malicious PDF — malware analysis report

Static analysis result for SHA-256 42b24dbfb2e60290…

MALICIOUS

PDF

47.7 KB Created: 2020-11-08 07:59:51 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: 7e523a6be549d5d45c635ff1d802178f SHA-1: 90c96f847c635e8258d4b40c95acc40ac0af9176 SHA-256: 42b24dbfb2e602903a7d01519126cf2930f5cde3165ee42b6fcef9a23829324c
74 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution T1059.007 JavaScript

This PDF document was flagged as malicious by an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm and presents a deceptive download button. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://trafficel.ru/123?keyword=martin+o+connell+racing PDF link annotation
    • https://gufamaran.weebly.com/uploads/1/3/4/0/134017683/7923570.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383582/normal_5f9fb22de60de.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379053/normal_5fa034463939a.pdfIn PDF document text
    • https://lumixiwutetus.weebly.com/uploads/1/3/4/3/134388296/bigekek.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://gorujugiximu.files.wordpress.com/2020/11/karipevo.pdfIn PDF document text
    • https://s3.amazonaws.com/zizene/epic_theatres_gift_card_balance.pdfIn PDF document text
    • https://s3.amazonaws.com/mesixadelomomo/unicorn_pegasus_bakugan.pdfIn PDF document text
    • https://s3.amazonaws.com/nuxulikiwab/regofagosop.pdfIn PDF document text
    • https://danusodemoza.files.wordpress.com/2020/11/nutuxolalotab.pdfIn PDF document text
    • https://wulitop.files.wordpress.com/2020/11/modified_proctor_compaction_test.pdfIn PDF document text
    • https://s3.amazonaws.com/susopuzupure/tajupitujo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ec495708-d2a4-4e39-aaa5-fe6bbf9d97ef/zugudagugajowodeserizu.pdfIn PDF document text
    • https://movezuzeva.files.wordpress.com/2020/11/pallet_racking_installation.pdfIn PDF document text
    • https://s3.amazonaws.com/satedafadusizo/the_outsiders_questions_and_answers_chapter_5.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006ebd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6EBD 4580 bytes
SHA-256: d530bc8ff9ff8ec6ca0be8e03dcfee33c11ebfcbee3833594540d8774acb37f0
font_01_sfnt_off00007e52.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7E52 10668 bytes
SHA-256: 5dfb36111aeaa7e14d4c334705ed4ed706e1f78413c35d58847037ee040fb6a4
font_02_sfnt_off0000a2b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xA2B7 4324 bytes
SHA-256: 9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2

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