Malicious PDF — malware analysis report

Static analysis result for SHA-256 e95f55d5f1daee12…

MALICIOUS

PDF

123.4 KB Created: 2021-04-25 17:46:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: 6978c237c3b5227cc4e4816ac8c95206 SHA-1: 9c4ee700ff233439d3082abc48a26f23be0fdfd3 SHA-256: e95f55d5f1daee12f899c233a30dd01ba5f77a952099f0bb9dbcd5f2bfcf3f5a
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 high number of embedded URLs, many pointing to disposable domains, suggesting a link farm or phishing lure. The presence of external URIs and the PDF_SEO_DISPOSABLE_LINK_FARM heuristic strongly indicate an attempt to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

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://leonvi.ru/strik?utm_term=software+development+life+cycle+stages+explained PDF link annotation
    • http://fisujerekuvij.getenjoyment.net/alter_ego_3_mthode_de_franais_b1.pdfIn PDF document text
    • https://cdn.sqhk.co/romafime/iibb6je/56982807006.pdfIn PDF document text
    • http://sefegusekepuxa.mypressonline.com/medijimubewojoz.pdfIn PDF document text
    • http://gajaxujifusokul.mygamesonline.org/aladdin_story_in_english.pdfIn PDF document text
    • http://gulebamabixaku.22web.org/algebra_2_practice_problems_and_answers.pdfIn PDF document text
    • http://mowefopovog.mywebcommunity.org/11556688908.pdfIn PDF document text
    • http://pojebanidik.mywebcommunity.org/54778762940.pdfIn PDF document text
    • http://medazuxa.mywebcommunity.org/shakespeare_sonnets_summary_and_analysis.pdfIn PDF document text
    • http://zivufomureko.22web.org/67211477859.pdfIn PDF document text
    • https://cdn.sqhk.co/ripowusaro/Qjd7Cpa/carriage_house_apartments_vancouver_wa.pdfIn PDF document text
    • https://cdn.sqhk.co/vitozogog/7Rsk6hc/tema_para_festa_infantil_masha_e_o_urso.pdfIn PDF document text
    • http://kositexujir.sportsontheweb.net/statistical_methods_for_machine_learning_jason_brownlee.pdfIn PDF document text
    • https://cdn.sqhk.co/laloropaki/he7hgij/45592968313.pdfIn PDF document text
    • http://lijonotogi.scienceontheweb.net/kumolazajejajipo.pdfIn PDF document text
    • https://cdn.sqhk.co/pifajaloro/NieVgq9/marketing_plan_template_powerpoint_free_download.pdfIn PDF document text
    • https://gph.is/1lus4LpTheIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/fekazudabo/36929512730.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5d4ec67c-2846-46fb-8058-a6fc9e9b40ac/kerijimapipeselegepufo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/987dc5a3-1bc4-4096-be2a-6aca6aa4bfb3/why_wont_my_trimmer_start.pdfIn PDF document text
    • https://s3.amazonaws.com/lawakux/are_vizio_tv_remotes_universal.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5d7cab1d-4bd4-4cf2-ab24-ecae83b35832/45879190558.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/317760fc-6c5c-4367-9313-3f0331f7478d/behind_closed_doors_similar_idioms.pdfIn PDF document text
    • https://s3.amazonaws.com/rokuwapesu/fijilavibetamaxoxuk.pdfIn PDF document text
    • http://nufesuku.rf.gd/first_aid_course_2017.pdfIn PDF document text
    • https://s3.amazonaws.com/ruzaganog/what_is_the_main_idea_of_paragraph_13_the_monkeys_paw.pdfIn PDF document text
    • https://s3.amazonaws.com/wegugus/zurapijiluj.pdfIn PDF document text
    • http://nabunuwo.epizy.com/49207097593.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00018f25.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18F25 5900 bytes
SHA-256: cf9788ebf37d72665acaa69f35c4d862bc788e47abe1804e75c15e3d84234aba
font_01_sfnt_off0001a34b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1A34B 11224 bytes
SHA-256: ae90d47854a211f3de5af01fd38dea758997db0849edd812d5f5f550c2bef478
font_02_sfnt_off0001c9b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1C9B9 16204 bytes
SHA-256: e93acd332f5893643511f4cefd38969ad5c744ad1b08842a788b6be7d277dd15