Malicious PDF — malware analysis report

Static analysis result for SHA-256 0bf99959f215a783…

MALICIOUS

PDF

81.9 KB Created: 2021-03-02 05:40:03 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 40217ed8bf5e0cf0e9c0e7f17a693f73 SHA-1: 57de7bb56da9a109f284a3a721888491f5d7ee34 SHA-256: 0bf99959f215a783162d891eb80005733a1cf6151aeb970defe69445663d0eb0
186 Risk Score

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://resalured.ru/123?utm_term=juegos+del+hambre+2+pelicula+completa+en+espa%25C3%25B1ol+latino+online+gratis PDF link annotation
    • https://cdn.sqhk.co/jotapepikota/gjeZgcv/cake_cooking_show_oyna.pdfIn PDF document text
    • http://pukogika.iblogger.org/minecraft_guide_to_redstone_book.pdfIn PDF document text
    • http://dhl-order.info/domino_s_delivery_charge_vs_tip5dra1.pdfIn PDF document text
    • http://mitibazin.22web.org/81904228828.pdfIn PDF document text
    • https://cdn.sqhk.co/vuzowadijavu/jeSxifn/lasuboguwifos.pdfIn PDF document text
    • https://cdn.sqhk.co/gorokipo/hxc5pid/mortal_kombat_movie_1995_scorpion.pdfIn PDF document text
    • https://vawemuziz.weebly.com/uploads/1/3/5/3/135351027/7693726.pdfIn PDF document text
    • https://cdn.sqhk.co/buxifuludo/AuqhgVL/fun2_2_player_games_on_switch.pdfIn PDF document text
    • https://nodarato.weebly.com/uploads/1/3/4/4/134487471/1181334.pdfIn PDF document text
    • https://fudegedetet.weebly.com/uploads/1/3/4/7/134733785/disiwudupe.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/fokapikow/daffynition_decoder_answer_key_page_79.pdfIn PDF document text
    • https://s3.amazonaws.com/kisagoz/excel_read_sheet_name_from_cell.pdfIn PDF document text
    • https://s3.amazonaws.com/remuv/reading_comprehension_grade_8_worksheets.pdfIn PDF document text
    • http://gatoruvizuzil.epizy.com/happy_birthday_sister_gif_images.pdfIn PDF document text
    • http://zuwarikufaz.epizy.com/sevawanojijapojibop.pdfIn PDF document text
    • http://sokevojufepizi.rf.gd/negative_mandatos_tu_form.pdfIn PDF document text
    • http://papaxepetok.epizy.com/trip_hopper_wiring_diagram.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_off0000fbcf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBCF 5960 bytes
SHA-256: dde8fce67655eca0711634b8df5c356451ccabbffbb34d9f4a6b9d2a30d84b7c
font_01_sfnt_off00010fa3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FA3 11896 bytes
SHA-256: 654fcac79a87b3f31d22068a3da4f8a360983b1f9f06c4afb44ec4f6cfc13700

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