Malicious PDF — malware analysis report

Static analysis result for SHA-256 1a86df91d2c900b7…

MALICIOUS

PDF

75.9 KB Created: 2021-06-10 03:12:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: cb8ab30b01d59f978c510a4f658f72c5 SHA-1: 114a4b50ec76dc7bf14100e006fade1b08d98d0b SHA-256: 1a86df91d2c900b71f90692e22eff2b9d322abdbb97e985fac6baf0218494a9a
166 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 ClamAV and an ML classifier. It uses a fake browser/software-install lure. 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-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://catamma.ru/pbw?utm_term=ninja+bots+kahoot PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4383445/normal_6003f23b00025.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4488570/normal_5fe881909c005.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4392867/normal_60676d131b4cc.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4406464/normal_5fe598289ad56.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/de818e47-b4ff-4eec-9d15-8482d46dc500/24448608583.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7bdae043-4361-4c43-9120-aaf90c16ec68/how_to_change_painting_in_minecraft.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fc81dc1f-0c6a-4390-8a89-4955099351cb/diono_radian_cleaning_instructions.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/963e52e9-caf3-4eaf-9238-810caaeccdb0/japowolewumezolita.pdfIn PDF document text
    • http://rupebaxo.pbworks.com/w/file/fetch/145001406/92759263914.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/371297d5-db5c-40fc-b333-3564fba4348a/controle_addition_et_soustraction_de_fraction_4eme.pdfIn PDF document text
    • http://mikabipi.pbworks.com/w/file/fetch/144438921/hack_apk_download_roblox.pdfIn PDF document text
    • http://sorawako.pbworks.com/f/58482359456.pdfIn PDF document text
    • http://werinenimuta.pbworks.com/w/file/fetch/144516999/evinizdeki_terapist_indir.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/39be5569-00ec-4a73-8de1-8b702f78aa48/what_instrument_is_used_to_measure_air_flow.pdfIn PDF document text
    • http://katexawa.pbworks.com/f/bewutupuwikagojat.pdfIn PDF document text
    • http://zuvuzut.pbworks.com/w/file/fetch/144575748/wijevododaxaroxoxekakuda.pdfIn PDF document text
    • http://kedetuwi.pbworks.com/w/file/fetch/144930030/5930183233.pdfIn PDF document text
    • http://sawebaz.pbworks.com/w/file/fetch/144706344/76867622727.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/73465b82-5dc2-46cf-a25a-0799b0830a99/how_to_round_numbers_to_the_nearest_hundredth_in_python.pdfIn PDF document text
    • http://sorawako.pbworks.com/f/tewivanofug.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_off0000edb1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDB1 4896 bytes
SHA-256: af78909b578f45bb8bdd1d349c3096be1d64f38947854e876ce731d68adc3af6
font_01_sfnt_off0000fe5f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE5F 10440 bytes
SHA-256: 78d55b416d6d56d6df4fbe8bb01d3999acba23ad9d23741c68bf1e70b17de83c

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