Malicious PDF — malware analysis report

Static analysis result for SHA-256 52f5db6ce03c39c5…

MALICIOUS

PDF

75.8 KB Created: 2021-03-07 13:51:07 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: 827f08a0d2cf7b7528696b3f4049a396 SHA-1: 9fad25d90e30a1a5ac766db2aba1141ec970c44d SHA-256: 52f5db6ce03c39c53ab1f741d9f491ef29b23094c1ce469a084c7f69bd2450de
126 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous external URIs pointing to disposable hosting domains, suggesting a link farm or redirection mechanism. The document body, though heavily obfuscated, contains text related to 'conflict management' and 'wkhtmltopdf', which appears to be a lure to disguise the malicious nature of the links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://mezovuduw.ru/aws?utm_term=5+ways+of+conflict+management PDF link annotation
    • https://nimugafibe.weebly.com/uploads/1/3/6/0/136084612/5f9614873e77.pdfIn PDF document text
    • https://kupifima.weebly.com/uploads/1/3/0/7/130775493/ac2fdb3.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4454303/normal_5ffb2dcdb80b2.pdfIn PDF document text
    • http://dalifajebuxog.scienceontheweb.net/cuanto_es_800_gramos_en_mililitros.pdfIn PDF document text
    • https://zipobirin.weebly.com/uploads/1/3/5/3/135386694/d957c618.pdfIn PDF document text
    • http://vanimerukaguto.scienceontheweb.net/5_languages_of_apology.pdfIn PDF document text
    • http://juzezudusota.mypressonline.com/percy_jackson_movie_3_watch_online.pdfIn PDF document text
    • http://durebemidiges.getenjoyment.net/tekowomofijifazakejoda.pdfIn PDF document text
    • http://nizavevorupuj.mywebcommunity.org/kawitibiru.pdfIn PDF document text
    • http://mirijesuwakug.sportsontheweb.net/pozixudawutuz.pdfIn PDF document text
    • http://dimozakebaba.scienceontheweb.net/66255318477.pdfIn PDF document text
    • http://junumidutuzakox.getenjoyment.net/los_secretos_de_la_mente_millonaria_audiolibro_latino.pdfIn PDF document text
    • https://wojuguzibuliru.weebly.com/uploads/1/3/4/8/134896427/wopubiviwaginizow.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4470401/normal_5fe7875fe496e.pdfIn PDF document text
    • http://nesorus.mywebcommunity.org/law_of_sines_and_cosines_quiz_part_1_quizlet.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/nuselufuzo/brave_movie_in_tamil.pdfIn PDF document text
    • http://pixafur.atwebpages.com/87701932514.pdfIn PDF document text
    • https://s3.amazonaws.com/xalasawu/machine_language.pdfIn PDF document text
    • http://vajapojaperusu.myartsonline.com/what_is_burger_sauce_made_of_uk.pdfIn PDF document text
    • http://bolirazebaf.myartsonline.com/54821485751.pdfIn PDF document text
    • https://s3.amazonaws.com/tobovunoberiki/prince_of_persia_full_movie_filmyzilla.pdfIn PDF document text
    • http://rususekobijo.myartsonline.com/braun_thermoscan_7_vs_5.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_off0000ed07.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED07 5328 bytes
SHA-256: 64fd5e05da6efdd9ca206bd911aa371faa4413823aaa64920a35da360ce27aa1
font_01_sfnt_off0000ff3d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF3D 10364 bytes
SHA-256: 7833fe2964139684db6bd692451f2773a4bc413e3a99e0166b3488aaba54c10f

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