Malicious PDF — malware analysis report

Static analysis result for SHA-256 86f33297e950346b…

MALICIOUS

PDF

83.3 KB Created: 2021-03-28 17:03:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 57649cd37ccb0749df2a0da59b3dd590 SHA-1: 959e66ba0876012a12e61b57faed3a6629c267f1 SHA-256: 86f33297e950346bd8aaf52c1b794a735c47e674cc6d7099821db6ecd90f8273
96 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and a machine learning classifier indicated a high probability of maliciousness. An external URI pointing to 'zajinet.ru' was extracted, suggesting a phishing attempt to redirect the user to a malicious site. No scripts were extracted, but the presence of embedded URLs and the overall detection profile indicate a phishing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 4

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://zajinet.ru/strik?utm_term=d+and+d+motors+greer+sc
    • https://cdn-cms.f-static.net/uploads/4384145/normal_602ece8d25fa4.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://uploads.strikinglycdn.com/files/1b7b28cb-1942-4223-8866-bc4ce9726478/words_to_describe_someone_stressed_out.pdf
    • https://uploads.strikinglycdn.com/files/d462e4e9-84a4-4a95-90e4-25c9e9b07791/what_is_the_best_electric_type_pokemon_in_emerald.pdf
    • https://uploads.strikinglycdn.com/files/b68c2ae6-5ba3-406a-93c5-ac4b68cb4b9d/85456990610.pdf
    • https://uploads.strikinglycdn.com/files/13b32c69-fe43-4a47-8c1a-eddca5f96283/69109579098.pdf
    • https://uploads.strikinglycdn.com/files/2d5d8243-da76-44ce-a7ec-8c8e7a0f5416/regarding_operant_conditioning_which_term_does_not_belong_with_the_others.pdf
    • https://uploads.strikinglycdn.com/files/daa4aed1-5aaf-45c2-8581-51edcd64610c/coleman_gas_mobile_home_furnace_manual.pdf
    • https://uploads.strikinglycdn.com/files/02e3d1a4-3ee8-47b3-a656-55d754ba00f2/95139654459.pdf
    • https://uploads.strikinglycdn.com/files/c4970a38-ce77-4912-a2a3-ae0077ebc416/disoza.pdf
    • https://uploads.strikinglycdn.com/files/48f2eb60-a9ed-4417-b60e-b7f4e9faa100/88304869050.pdf
    • https://uploads.strikinglycdn.com/files/3e179431-63b8-4d8f-b449-543ebed54c03/sled_driver_book_buy.pdf
    • https://uploads.strikinglycdn.com/files/bace25aa-07c0-48ab-9274-7e9735f53245/war_horse_cast.pdf
    • https://uploads.strikinglycdn.com/files/4c0d0672-529d-43bc-b516-feb2f63c5f66/william_shakespeare_sonnet_18_summary.pdf
    • https://uploads.strikinglycdn.com/files/ebde6125-39c7-4017-9ed0-ab0f056ac4a8/gujaxowekidelumuvexatim.pdf
    • https://uploads.strikinglycdn.com/files/66829441-fc5e-4156-98da-82f676dd3da0/47034013118.pdf
    • https://uploads.strikinglycdn.com/files/b3192e65-41a7-4fb8-823c-6c56c184a0d8/zowab.pdf
    • https://uploads.strikinglycdn.com/files/bd06ca7a-613a-4ec6-921f-5dc9be50e16d/89801361366.pdf
    • https://uploads.strikinglycdn.com/files/38761e9f-0e70-4cf2-88e3-9efa26a4bb5e/how_to_solve_missing_number_problems_ks2.pdf
    • https://uploads.strikinglycdn.com/files/3050b393-5072-460c-8e2c-c5d32052071c/25620276595.pdf
    • https://uploads.strikinglycdn.com/files/107ac1e8-89f5-477f-97ff-87d667a3970b/facebook_login_identity_recovery.pdf
    • https://uploads.strikinglycdn.com/files/17de42da-9d37-4c44-967f-9cf486d54c4b/la_ciudad_de_las_bestias_english.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fa41.bin
6c5d8318aea6727b6c741b1c052ac8e2dfe11e07c919e981185c6dbacb91b15c
pdf-font-stream PDF embedded font (sfnt) at offset 0xFA41 4968 bytes
font_01_sfnt_off00010afe.bin
e9ad1eda8727846aa690e7c21c4077d45c05a3d4c253d3017dc4f5baf4e2f23c
pdf-font-stream PDF embedded font (sfnt) at offset 0x10AFE 11184 bytes
font_02_sfnt_off00013129.bin
ce7e2e230a41ba6fc2d7d2240890c8289d67876d84a3d076d67c0b48111c8230
pdf-font-stream PDF embedded font (sfnt) at offset 0x13129 4324 bytes