Malicious PDF — malware analysis report

Static analysis result for SHA-256 96633aa5be2ea510…

MALICIOUS

PDF

77.1 KB Created: 2021-03-22 17:48:38 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: a523593f16a8b492de1576b6730cf7bc SHA-1: 1feaefd1b7b503addd3022cfedbcc8519b39101d SHA-256: 96633aa5be2ea510f7fe792b42a76d2ddb847a7f41b2e64509fce0583309096d
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://xajibur.ru/strik?utm_term=importance+of+karst+topography+to+man PDF link annotation
    • https://cdn.sqhk.co/kavejufa/0Mrgchj/viking_wars_and_battles.pdfIn PDF document text
    • http://dobomasinuraz.iblogger.org/27761611164.pdfIn PDF document text
    • https://cdn.sqhk.co/kerutadit/hfgjsjb/slack_ipo_stock_symbol.pdfIn PDF document text
    • http://filozajerezabi.getenjoyment.net/47845024922.pdfIn PDF document text
    • https://cdn.sqhk.co/revinoxu/Xhjxygd/pot_painting_ideas_for_diwali.pdfIn PDF document text
    • https://cdn.sqhk.co/fokofike/czjdSJ3/supadoxunoxir.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/1edcc7cc-78e5-4bd7-963d-597550ac7130/traxxas_stampede_2wd_mods.pdfIn PDF document text
    • https://s3.amazonaws.com/jemazejodep/bsc_physics_books_free.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bfe6ab65-07cb-4d92-b536-77a3b012a902/harrisons_manual_of_medicine_20th_edition_ebook.pdfIn PDF document text
    • https://s3.amazonaws.com/legipalofi/zara_jeans_size_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/sepovutapakogaf/pdf_to_autocad_converter_online.pdfIn PDF document text
    • http://gaxufaxurawago.epizy.com/book_publisher_wordpress_template.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6df1c797-5ccc-4bc2-80df-6fc7aad0568f/65648042122.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4e1b23fa-738a-4ba3-80e1-b17703fea599/koxekojulogofefegobi.pdfIn PDF document text
    • http://durenifujogax.myartsonline.com/hotel_architecture_design.pdfIn PDF document text
    • http://wolodavufaxus.rf.gd/5069739292.pdfIn PDF document text
    • http://kuwitabetegipo.myartsonline.com/how_to_use_proform_without_ifit.pdfIn PDF document text
    • https://s3.amazonaws.com/xapota/korojetujetixotubariwoza.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/78ebf71c-e3a6-460f-9cc8-619cf0a3e63f/kitchenaid_professional_600_series_kp26m1xer_bowl-lift_stand_mixer_6_quart.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_off0000efe8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFE8 5500 bytes
SHA-256: ec17427ff3e72525014e09cb499c0b46e261dc401fead9613e319d3e52ed87e0
font_01_sfnt_off00010280.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10280 10716 bytes
SHA-256: eaca430d1e3a470bd190de7c98ab5d41874d937786409488f77643aebb5fcf49

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