Malicious PDF — malware analysis report

Static analysis result for SHA-256 82a8b4cbd5961462…

MALICIOUS

PDF

79.4 KB Created: 2021-03-16 23:27:43 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1f55bb396d04efa1e31699760bc523f3 SHA-1: 12fa77a3368c040674561501957dea8b946d0c1e SHA-256: 82a8b4cbd59614620b58070e6f5a05ba24ba8e97dda24c43770ff9dc464cef91
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to disposable domains and are structured as search result links, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of a malicious document designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://jacksth.ru/strik?utm_term=is+2.4+amp+charger+good
    • http://fenellalucynelle.info/mecanica_de_materiales_solucionariovp0l6.pdf
    • http://nelawetazabuta.66ghz.com/zaganibijopivupegemu.pdf
    • http://xufotegebiv.22web.org/88705835420.pdf
    • http://bnl-jobs.com/dirty_pretty_things_bande_annonce_vf1bt87.pdf
    • http://fufejezonodim.mywebcommunity.org/what_age_group_is_the_book_smile_for.pdf
    • http://salonvarna.com/lizagituzijewetuwosojy1mh.pdf
    • http://hayatevesigar.online/wedetq5xt4.pdf
    • http://prostotit.site/sapoduxikomabafirusxnwc.pdf
    • http://birjand.design/who_is_better_elvis_or_the_beatlestsgpf.pdf
    • http://logvoz.ru/sony_wireless_bluetooth_headset_manual6pf4x.pdf
    • http://trells.space/samsung_washing_machine_not_spinning_properly9ttzr.pdf
    • http://midadef.iblogger.org/diagnostico_asma_pediatria.pdf
    • http://sevastopol.sale/tewobolaxivavupxo4l.pdf
    • http://bluebadgeform.com/street_law_a_course_in_practical_law_10th_editionabvhu.pdf
    • http://misujupino.getenjoyment.net/jetim.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://bexovivuvere.myartsonline.com/49492711318.pdf
    • http://sofojosib.rf.gd/pesunelunifitexuvabadiwov.pdf
    • https://s3.amazonaws.com/medaliwifufugel/barry_white_free_music.pdf
    • https://s3.amazonaws.com/nerugiraxura/84002464529.pdf
    • http://mifotabelimudon.myartsonline.com/python_iterate_dictionary_example.pdf
    • http://zuzojep.rf.gd/13956132087.pdf
    • http://pudawetik.rf.gd/flight_of_the_bumblebee.pdf
    • http://xolavozezimodan.onlinewebshop.net/51443806059.pdf
    • http://pogitijerilux.epizy.com/45508737652.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f8a4.bin
43fdc73e782cb68316153ea4f8abd7c6f693f455998541f2165f3dfd0c88b876		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF8A4 5644 bytes
font_01_sfnt_off00010bb8.bin
41eea72594fb88b2157cea2894ade00f549f06b834547b4dca20233afec5eee1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10BB8 10776 bytes

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