Malicious PDF — malware analysis report

Static analysis result for SHA-256 c5d0eae9a8233bfd…

MALICIOUS

PDF

82.2 KB Created: 2021-04-01 10:22:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ada69c21f5b5b3d34c020e8378bf6437 SHA-1: 7cbafddd69537a879a4eeba3b9c46239daf35bd1 SHA-256: c5d0eae9a8233bfd5743fd2c6f1056b3fd76659111d0ce6ce5616272fe0da774
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, with one prominent URL pointing to a suspicious domain ('resalured.ru') that is likely used for phishing or malware distribution. The heuristic 'PDF_SEO_LINK_FARM' indicates a large number of external PDF links, suggesting a link farm for SEO manipulation or to host malicious content. ClamAV detection as 'Pdf.Phishing.Trojan' further supports the malicious nature of the file.

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://resalured.ru/123?utm_term=amadeus+commands+manual+pdf
    • http://vevolim.iblogger.org/bone_scan_informacion_en_espanol.pdf
    • http://badge-verification-center.com/7100245134035pxu.pdf
    • http://rawenspant.online/propresenter_free_media_bundle85c17.pdf
    • http://sibepizibatiza.iblogger.org/69840235007.pdf
    • http://brumbum2.xyz/extremerate_ps4_controller_dtfs_led_kitep6aq.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/kasuwevovog/25166489350.pdf
    • https://uploads.strikinglycdn.com/files/2bf7ad98-977a-402b-9812-6bf13afc4081/tipos_de_grupos_sanguineos_y_rh.pdf
    • https://s3.amazonaws.com/fulosobezur/shimano_di2_groupset_tt.pdf
    • https://uploads.strikinglycdn.com/files/42e2df37-00e5-426a-8a8f-37272843e284/how_to_wire_a_car_alarm_siren.pdf
    • https://s3.amazonaws.com/dopugaxelelema/4_years_experience_software_testing_interview_questions.pdf
    • https://d6aab468-caab-4d9e-910f-d3bf64ae4104.filesusr.com/ugd/5438e3_942eac8d248044da970eb7251860554c.pdf?index=true
    • https://s3.amazonaws.com/nutanigonu/risk_management_process_in_insurance.pdf
    • http://wesukaxibofawu.epizy.com/anarchy_state_and_utopia_book.pdf
    • https://d6d3a1c5-32ce-46e9-ae92-c5b8d84d65d9.filesusr.com/ugd/a3b54b_e676bc62f7ca4b6184068a681deea6ad.pdf?index=true
    • https://uploads.strikinglycdn.com/files/e8b5bddb-edae-4cad-9bed-9e70d2728af9/average_salary_for_entry_level_public_relations.pdf
    • https://cad90261-f038-4e8a-b384-2e0e37e6cb8c.filesusr.com/ugd/4c4e45_a13764a582bc40ecb11c9d218e2a57c8.pdf?index=true
    • https://uploads.strikinglycdn.com/files/394af705-3171-4c58-a685-924a92332c66/how_to_setup_hp_officejet_h470_wireless.pdf
    • https://s3.amazonaws.com/wexukufedepim/10601848776.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_off000101f8.bin
bfd113091ccc1f1347d10025b92faf96f8a8023eee8492bafa8cb2bfd821a5db		 pdf-font-stream PDF embedded font (sfnt) at offset 0x101F8 5196 bytes
font_01_sfnt_off00011398.bin
200564dd549d910f1bb21c2bcceb8d914aedb907772678b5669f080a3cad9bfc		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11398 11880 bytes

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