Malicious PDF — malware analysis report

Static analysis result for SHA-256 b90bd3a68a32f2e0…

MALICIOUS

PDF

98.5 KB Created: 2021-04-22 22:57:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: 4c6303b0ce564e44048eef6bb7342c96 SHA-1: 16454e03a4f55e58831448b8e70db4ec6f2ed059 SHA-256: b90bd3a68a32f2e05c4139ca9e5dd201df475ee6a41782248b02cbc89a55df43
126 Risk Score

Malware Insights

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

The file is identified as malicious by ML classifiers and ClamAV, specifically as a phishing trojan. It contains numerous embedded URLs pointing to disposable hosting, suggesting a link farm or redirection mechanism to deliver malicious content. The PDF structure and embedded URLs indicate an attempt to trick users into visiting potentially harmful sites, aligning with spearphishing tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://pelibifir.ru/strik?utm_term=social+psychology+experiments+bystander+effect PDF link annotation
    • http://vigirorimikana.medianewsonline.com/zejirapenirepijanelujad.pdfIn PDF document text
    • http://juxumigine.mypressonline.com/circular_motion_mcq_questions_and_answers.pdfIn PDF document text
    • http://xejapuz.getenjoyment.net/under_the_dome_full_movie_download_hindi_dubbed_online_watch.pdfIn PDF document text
    • http://zinefikitozozeg.sportsontheweb.net/92840060743.pdfIn PDF document text
    • http://tofugezupeb.mygamesonline.org/32243067490.pdfIn PDF document text
    • http://libutulidux.medianewsonline.com/electronics_and_communication_engineering_projects.pdfIn PDF document text
    • http://rupiwot.getenjoyment.net/zabaxujazuweg.pdfIn PDF document text
    • http://womizepivilora.sportsontheweb.net/66417977111.pdfIn PDF document text
    • http://junumidutuzakox.getenjoyment.net/46748336566.pdfIn PDF document text
    • http://zuregazezoral.mygamesonline.org/36862571433.pdfIn PDF document text
    • http://golesaluwo.66ghz.com/xodel.pdfIn PDF document text
    • http://bukupiduge.mypressonline.com/domukazopixufafa.pdfIn PDF document text
    • http://firobazotu.sportsontheweb.net/alma_aridatha.pdfIn PDF document text
    • http://kafalukuwemi.mygamesonline.org/85285018355.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/da4c750c-79ad-49d5-83d4-af07d095a0ba/best_penny_stocks_for_2021_under_a_dollar.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/66f53c57-0f6f-421b-9946-2acc475257fa/venaverigaw.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/93259688-19eb-43f2-b05f-53cb74948551/differences_between_quantitative_and_qualitative_research_methods.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ef2cd4ca-7136-45df-b9f2-399abfae1483/first_alert_carbon_monoxide_alarm_blinking_red_light.pdfIn PDF document text
    • http://moxuzaridob.onlinewebshop.net/sofisedo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b77421e7-2541-4f7a-853a-f945fb2c786f/best_pressure_cooker_for_canning_venison.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/00d17d4b-f78e-4bba-83a0-d1fa37eacd63/milujibujusajexuj.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b8407ced-7017-454b-89c0-be862d5c255e/lubasodogukedomupavafibo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c520ab0f-3a1d-4909-a56a-34cc4d800440/neuro_linguistic_programming_for_dummies_free_download.pdfIn PDF document text
    • http://xosatog.epizy.com/nosajutudurifisowotutagi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7c265d78-5afc-4abf-8d6a-8e41826c2deb/zofutigixutifimazuluwi.pdfIn PDF document text
    • http://gakamaxoluzes.atwebpages.com/xamur.pdfIn PDF document text
    • http://ratadipemor.epizy.com/cot_bed_fitted_sheets_120_x_60.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5635485f-f4f2-4312-8885-083e22227c69/xazewojodajibavu.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_off00013fe7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13FE7 5984 bytes
SHA-256: fe8272bfb58cf6198d8125475de4a61e1ef7b5b6d0226236bf37c80559b03efd
font_01_sfnt_off00015423.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15423 11724 bytes
SHA-256: 900b571f06bede5fe746d433b28880b457c71ac7236b532b5915d68a7c5ca17d