Malicious PDF — malware analysis report

Static analysis result for SHA-256 de09d0ceb0d6b756…

MALICIOUS

PDF

98.5 KB Created: 2021-03-18 16:39:07 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: 0ea8166322d9d11c1eb19e2172d284ce SHA-1: 24179604553899333c0db3da213479d0a9700a82 SHA-256: de09d0ceb0d6b75634b103334d7e8ed89453757e7ce334da75ecb3c83534796e
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains a large number of embedded URLs, many pointing to disposable domains, suggesting a link farm designed to redirect users to malicious sites. The document body, though heavily obfuscated, contains metadata related to the creation of the PDF, and the presence of numerous external URIs indicates an attempt to lead the user to external resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://resalured.ru/wix?keyword=hec+ras+manual+culvert PDF link annotation
    • http://maykistore.ru/kittens_first_full_moon_book_summaryl1qe2.pdfIn PDF document text
    • http://loziwazekon.medianewsonline.com/mekubalajev.pdfIn PDF document text
    • http://xejopegig.mypressonline.com/best_coding_books_for_beginners_2020.pdfIn PDF document text
    • https://nigafabap.weebly.com/uploads/1/3/4/3/134377596/96f535a571bb058.pdfIn PDF document text
    • http://xevazabavivan.22web.org/java_string._format_online_tester.pdfIn PDF document text
    • http://profapp.pro/23359938727dncek.pdfIn PDF document text
    • https://sidomepavoresob.weebly.com/uploads/1/3/5/3/135322675/pizusu_valepupube.pdfIn PDF document text
    • http://xovitixekewelom.scienceontheweb.net/customs_declaration_us_form.pdfIn PDF document text
    • https://vudujetejagug.weebly.com/uploads/1/3/4/6/134674723/wavemuvalibatu.pdfIn PDF document text
    • https://bafuzonexive.weebly.com/uploads/1/3/0/7/130739369/7b88eda.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/fidobakipivogit/67424984471.pdfIn PDF document text
    • https://s3.amazonaws.com/sebunuzu/copyright_symbol_android_phone.pdfIn PDF document text
    • http://nafopafilor.epizy.com/zalowokexiwokamepar.pdfIn PDF document text
    • http://zuriromaruwo.epizy.com/psychology_facts_in_tamil.pdfIn PDF document text
    • http://goxakimolo.epizy.com/latest_bollywood_mp4_movies_free_2018.pdfIn PDF document text
    • https://s3.amazonaws.com/dosalapasenow/boxojozajifivalapexuza.pdfIn PDF document text
    • http://mepitar.atwebpages.com/cadette_amaze_journey.pdfIn PDF document text
    • http://suziben.rf.gd/dezalovilom.pdfIn PDF document text
    • http://dilutibu.onlinewebshop.net/duwemo.pdfIn PDF document text
    • http://rimutapewite.rf.gd/numagasefiteti.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_off00014564.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14564 4964 bytes
SHA-256: 72aaaf583101d612a78286b8fbeb0d466ccd975f6773ada95fea91484e6cacb8
font_01_sfnt_off00015633.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15633 10876 bytes
SHA-256: 75599e6106497f207aca35265804859bb51afbb3322989d844f0c8865a86e46d

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