Malicious PDF — malware analysis report

Static analysis result for SHA-256 93ff4e5194385061…

MALICIOUS

PDF

78.1 KB Created: 2021-03-18 15:25:42 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f5ad4c3c4bacf684921919019287f614 SHA-1: e3788f9c0645ec41f9e6b3438cdcd9da9dc1ade0 SHA-256: 93ff4e5194385061d3c5ff2d97eaf05bba99e00531e2c461c3f837920e379138
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, with a critical heuristic identifying it as a link farm. One of the primary external URIs points to 'bologen.ru', suggesting a redirection to a potentially malicious site. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://bologen.ru/award?keyword=english+learning+book+pdf+download
    • https://cdn.sqhk.co/tagodepa/fZM7gi5/swing_states_electoral_college.pdf
    • https://cdn.sqhk.co/vupapevixu/hgib57R/pixel_battle_royale_unblocked_76_games.pdf
    • https://cdn.sqhk.co/defisepeniba/jjjd7h0/dojikofaligopag.pdf
    • https://cdn.sqhk.co/valujoper/mhhljbJ/62437326221.pdf
    • https://cdn.sqhk.co/mojikeke/gh0Pugh/19272142413.pdf
    • https://cdn.sqhk.co/tigafita/hegOhco/java_project_manager_interview_questions_and_answers.pdf
    • https://cdn.sqhk.co/tikugubobo/B34grig/iphone_user_guide_for_ios_8.pdf
    • https://cdn.sqhk.co/xoxamomajil/jhAKhi5/latigos_de_cuero.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/244ae870-7326-4be4-96ff-70c33218eab0/wexoxijojezujofagod.pdf
    • https://uploads.strikinglycdn.com/files/8dd4a89f-7625-4be6-b851-66ef161fead4/is_safety_1st_a_good_brand.pdf
    • https://65d0a56f-4074-4e8f-9acc-29e6f8e8f663.filesusr.com/ugd/37655d_a98dd243be6f44c69d8cc28772edfae7.pdf?index=true
    • https://f84ffea9-2755-49c2-9cb5-47ca8b55fe65.filesusr.com/ugd/0adedf_9df73221344b461aa3de0ff88f7dbd41.pdf?index=true
    • https://s3.amazonaws.com/ruzumeb/que_es_estilo_de_vida_segun_autores.pdf
    • https://uploads.strikinglycdn.com/files/1b88ed1b-e515-431e-ad84-0835e9217d6a/what_are_the_principles_of_instructional_materials.pdf
    • https://s3.amazonaws.com/muxegeza/lake_merwin_kokanee_fishing_report.pdf
    • https://s3.amazonaws.com/lovomijelun/is_the_kjv_the_most_accurate_translation.pdf
    • https://uploads.strikinglycdn.com/files/3c5a3699-9032-4e57-8070-8c46ae69f6dc/can_you_use_headphones_with_roku_tv.pdf
    • https://s3.amazonaws.com/xasovewipeje/ielts_essential_guide_listening.pdf
    • https://s3.amazonaws.com/wifukedot/ms_office_activator_for_windows_10.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_off0000f359.bin
41f951b04d35cca238e65f3ee4d2adc5c72863884df651875a37ce143db44d82		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF359 5556 bytes
font_01_sfnt_off0001064b.bin
a11b2c3b72b9b87e2910d5a4474b9a3af98d187a9e765cef7ca432cf6710c7e3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1064B 10916 bytes

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