Malicious PDF — malware analysis report

Static analysis result for SHA-256 85c9d52cdd858f3d…

MALICIOUS

PDF

77.3 KB Created: 2021-04-01 18:59:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 9a29a923ebb2d7ef7b83e9c38719109a SHA-1: d81f99248aa9a30dcac7e05d3860f061cd0bcbc4 SHA-256: 85c9d52cdd858f3d390c37e6ca4294b32e4ff417cc26df4be2ed7fa4562ce3a7
166 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a phishing and trojan threat. The heuristic 'SE_BROWSER_INSTALL_LURE' suggests the document's content is designed to trick users into installing malicious browser extensions or updates. The presence of multiple external URIs, including one pointing to 'resalured.ru', further supports the phishing and potential payload delivery intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Browser extension / update installation lure high SE_BROWSER_INSTALL_LURE
    Document tells the user to install a browser extension, plugin, viewer, or browser update to view content — a common social-engineering path for credential theft and malware installation
  • 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=windows+10+terbaru+oktober+2018 PDF link annotation
    • http://amorexpo.com/zidazutibidesovaxuzay5iev.pdfIn PDF document text
    • http://fezufizibum.mypressonline.com/design_elements_graphic_style_manual.pdfIn PDF document text
    • http://wapividazofar.scienceontheweb.net/faguwenonezifopaja.pdfIn PDF document text
    • http://dietnatur.fun/xozobufubils76q4.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://kifesafijupesob.onlinewebshop.net/how_to_brew_john_palmer_2017.pdfIn PDF document text
    • https://6cdb29d4-22ce-4aaf-9e51-562b59d50851.filesusr.com/ugd/1b20fb_b424f34d10594123abc149d3a1625a51.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/7bc8a4bd-e839-4a5d-8add-0e8e4f0cd772/que_significa_estilo_de_vida_saludable.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f891f409-fc86-4bf5-86bf-acd213ed4975/how_to_download_the_sixth_and_seventh_book_of_moses.pdfIn PDF document text
    • https://4cd5eafb-d261-4666-a528-29b55b1676c1.filesusr.com/ugd/8dde66_06bfa71bc7684e399f3d7dde573d15f8.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/16edc7b4-aa4b-42f0-918c-e8767557db99/17349077778.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c50d71b5-9ee2-4258-a99f-82c3b6bf2881/ribokumuvavizawobakus.pdfIn PDF document text
    • http://tuxefunuzire.atwebpages.com/active_directory_windows_server_2020_tutorial.pdfIn PDF document text
    • https://1b3fde16-7575-45ba-b40e-8916c64185ca.filesusr.com/ugd/8874e8_2b47e7271cef41a2a851633d582fb07d.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/abc42c1b-0dbd-4ddd-8286-68338c641d8e/singer_sewing_machine_model_301_manual.pdfIn PDF document text
    • https://b0cee159-9ce3-47d2-9452-de9e383f1b6b.filesusr.com/ugd/fac5c7_e6aeb495e1e047e1a8e7b8c02ac3221b.pdf?index=trueIn PDF document text
    • http://nujugeteteda.myartsonline.com/john_deere_2653a_owners_manual.pdfIn PDF document text
    • http://rabatelekovufar.myartsonline.com/biteforabebiso.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0c54c538-039b-4a44-9540-c9dab88addeb/bbc_english_for_beginners_online.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_off0000e5f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5F0 5616 bytes
SHA-256: 0fd89de80ab0564da792edeb585b1e4cefa1d0f1d3b9af60c9eec1ed9734199f
font_01_sfnt_off0000f92d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF92D 1800 bytes
SHA-256: 51ebeec29509b87aa858d500e37ac8853184703d07d1f913ce36d8e1dc7764c0
font_02_sfnt_off000101bb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101BB 11088 bytes
SHA-256: 05602aa43658355c1170b0d7a6ac7488843ab49dbdd490ea4ca3ecee36c458b8