Malicious PDF — malware analysis report

Static analysis result for SHA-256 751a44468e1f87b3…

MALICIOUS

PDF

73.8 KB Created: 2021-04-02 01:37:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: b68a0b067f067384ee6014e5324e4b87 SHA-1: d2f25b6174a53350bf63ee9f17e576e2e972f9ae SHA-256: 751a44468e1f87b3204d47caa6d93f0ff9374f80cd81abd3a1652f92bb422373
134 Risk Score

Malware Insights

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

The PDF contains numerous external links, many pointing to disposable domains, and is flagged by ClamAV as 'Pdf.Phishing.Trojan'. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a link farm on disposable hosting, suggesting a phishing or malware distribution attempt. While no scripts were explicitly extracted, the presence of PDF_URI and ML_NYX_PDF_MALICIOUS firings, combined with the link farm heuristic, strongly suggests a malicious intent to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://maypoin.ru/strik?utm_term=canon+speedlite+580ex+manual PDF link annotation
    • https://cdn.sqhk.co/nokotadi/ioDjbih/my_talking_tom_2_game_download_for_android.pdfIn PDF document text
    • http://sopisafexuj.sportsontheweb.net/accounts_payable_notes_in_sap_fico.pdfIn PDF document text
    • http://suporefebakibur.mygamesonline.org/34664825253.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4373526/normal_5fef7d3c7b679.pdfIn PDF document text
    • https://cdn.sqhk.co/rivitovolu/hjzgdjj/disney_crossy_road_secret_characters_wreck_it_ralph.pdfIn PDF document text
    • https://cdn.sqhk.co/sunomedude/B8kcSgg/nofosumo.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368219/normal_6022928725ee2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450337/normal_602edd70292c1.pdfIn PDF document text
    • https://cdn.sqhk.co/xasurila/haigSih/download_era_of_war_mod_apk_android_1.pdfIn PDF document text
    • http://bokaxakoz.sportsontheweb.net/pdf_book_maker_apk.pdfIn PDF document text
    • http://berefiruzo.mygamesonline.org/xuvafifovanepinafubu.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://60f6da8c-824c-4163-aae9-6195f2ac7ed4.filesusr.com/ugd/7f16bd_f859170bd398467bb9ee600d9c53c42e.pdf?index=trueIn PDF document text
    • https://393102e6-89af-4738-8cad-89662dba8dc5.filesusr.com/ugd/33a16d_8c6e066f9adc45b88f6b2986f005fa3e.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/simujix/how_to_write_a_mystery_novel_outline.pdfIn PDF document text
    • https://e9593579-f51f-4dc6-af55-2543ab512b45.filesusr.com/ugd/37952c_101b7ae3d76e40ff8c7e10c6d0beed39.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/kefefetafij/61323649168.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5813e126-5c58-471b-a2dd-eef20f40c8dc/priscilla_shirer_armor_of_god_session_1_full_video.pdfIn PDF document text
    • https://6cdf8c5e-36a0-4b6d-987f-32d3d50030cd.filesusr.com/ugd/3c2e2e_2c2334f7ee6b4af3b654917be997cae1.pdf?index=trueIn PDF document text
    • http://luxupuxud.myartsonline.com/david_ramsey_financial_planner.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8b18351a-3d85-49b2-9fce-e8c2fae91fd2/interview_questions_to_ask_your_parents_about_their_childhood.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_off0000e329.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE329 5440 bytes
SHA-256: b45d8ba2e2219dcffad0e4f3136e67abfc5ba47e91be2f544d546b47197a61b4
font_01_sfnt_off0000f5a0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5A0 10792 bytes
SHA-256: 6638a932f001c939d7e5d9a66031c14a078a623ce44f271ded9e72452c35cf0f