Malicious PDF — malware analysis report

Static analysis result for SHA-256 1d3bdb0069a397b9…

MALICIOUS

PDF

75.8 KB Created: 2021-05-14 22:40:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: e3a2c8f5faf1c1d44926a8a5efee545d SHA-1: 33c49f956a4a457f49b1d2ca446d282935438ac6 SHA-256: 1d3bdb0069a397b99d6cf6a266c4ed6a37bee205d1801c38630897dc7376eb6a
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 0.9995

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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/strik?utm_term=reading+comprehension+paragraphs+for+adults PDF link annotation
    • https://cdn.sqhk.co/tobijoge/j7r7pge/kodiak_island_alaska_map.pdfIn PDF document text
    • http://getepitisux.mywebcommunity.org/rufimitadufazozibisipika.pdfIn PDF document text
    • http://lighterusb24.site/subgame_perfect_equilibrium_examplesdjukf.pdfIn PDF document text
    • http://tonojodozif.mypressonline.com/jevusarivarozoko.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4371800/normal_5ff1dbdc67daf.pdfIn PDF document text
    • http://birebap.scienceontheweb.net/minn_kota_i_pilot_link_app.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408709/normal_60241f093e4b8.pdfIn PDF document text
    • http://wotidoteked.mywebcommunity.org/adverb_definition_and_examples.pdfIn PDF document text
    • http://prizinsta365.website/nukanewevixegegodasaxie07hk.pdfIn PDF document text
    • https://cdn.sqhk.co/zimuteraf/cIgekVZ/3690611298.pdfIn PDF document text
    • https://mamifonor.weebly.com/uploads/1/3/1/1/131163935/7175389.pdfIn PDF document text
    • http://vevufilusik.scienceontheweb.net/agronomy_notes.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4407749/normal_5fed72a6e8c50.pdfIn PDF document text
    • https://refapezi.weebly.com/uploads/1/3/4/9/134904673/lutadowex.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4475728/normal_601ad2d287443.pdfIn PDF document text
    • http://soferijivav.getenjoyment.net/xajegogapufokejoko.pdfIn PDF document text
    • https://ganakinupep.weebly.com/uploads/1/3/4/5/134599301/rapunuferexizi.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4496374/normal_605c6c46b5a5d.pdfIn PDF document text
    • http://myyshooop224.site/why_were_the_new_england_colonies_startedn5p5b.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://gakilasefit.myartsonline.com/embolism_pathology.pdfIn PDF document text
    • http://revudipepofaten.myartsonline.com/beginners_bass_guitar_book.pdfIn PDF document text
    • http://geforagegi.atwebpages.com/33377618348.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_off0000ea05.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA05 5576 bytes
SHA-256: a7558c69c3e60a2cd02b8e1e8616d3b2705017c15e57fe8a43a2950ac0aea224
font_01_sfnt_off0000fcde.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCDE 10652 bytes
SHA-256: 0b41318b568b24899f2e59e418b1a5dc50694f63367cbb9065e83725e094e7fa

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