Malicious PDF — malware analysis report

Static analysis result for SHA-256 50c44dbda10b9a14…

MALICIOUS

PDF

70.0 KB Created: 2021-05-28 07:48:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 8106c5db4487300fd33abde243261e8a SHA-1: 6b952f90f70f2c4229294a8f7fc8f78d6b3107c2 SHA-256: 50c44dbda10b9a14f84adf2317cac455b349d97c24ffa091a94847e36fcffa5d
96 Risk Score

Malware Insights

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

The file is a PDF document that contains an embedded URL pointing to a suspicious domain. The ML classifier and ClamAV detection strongly indicate maliciousness, likely for phishing or malware distribution. The document body is heavily obfuscated, but the presence of an external URI suggests an attempt to redirect the user to a malicious site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

Heuristics 4

  • 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://jumiwimov.ru/123?utm_term=bosch+rexroth+aluminium+profile+cad
    • https://cdn-cms.f-static.net/uploads/4467975/normal_60314af4b36c5.pdf
    • https://static.s123-cdn-static.com/uploads/4473619/normal_5ff5fe6ce1522.pdf
    • https://cdn-cms.f-static.net/uploads/4386337/normal_60552627e7eae.pdf
    • https://cdn-cms.f-static.net/uploads/4478687/normal_600b6bfb42512.pdf
    • https://cdn-cms.f-static.net/uploads/4471230/normal_60466aced0412.pdf
    • https://static.s123-cdn-static.com/uploads/4474746/normal_5fcf473cd42cb.pdf
    • https://static.s123-cdn-static.com/uploads/4384459/normal_5fcfa967bfae8.pdf
    • https://cdn-cms.f-static.net/uploads/4475382/normal_6067aba5d0b42.pdf
    • https://static.s123-cdn-static.com/uploads/4417809/normal_5ffa19a2a6515.pdf
    • https://cdn-cms.f-static.net/uploads/4401558/normal_603cfcc835864.pdf
    • https://static.s123-cdn-static.com/uploads/4390382/normal_6000fb082c69f.pdf
    • https://cdn-cms.f-static.net/uploads/4457592/normal_5fd5f65e24357.pdf
    • https://cdn-cms.f-static.net/uploads/4392195/normal_606e538d54308.pdf
    • https://static.s123-cdn-static.com/uploads/4464330/normal_5fcf2b9f4a9e9.pdf
    • https://cdn-cms.f-static.net/uploads/4465392/normal_5fd65b8f454a3.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/474f5cd9-6e25-41e9-b42f-d18b0399e45c/samsung_smt-c5320_troubleshooting.pdf
    • https://uploads.strikinglycdn.com/files/2609f8d2-60fb-48c6-99e3-5e5ebbdae323/46427931098.pdf
    • https://uploads.strikinglycdn.com/files/0c334558-61e4-4250-b804-66eafbfbe174/how_much_weight_does_the_total_gym_hold.pdf
    • https://uploads.strikinglycdn.com/files/ff4da55b-b858-4995-aade-9e2b35cc5a58/how_to_change_my_vizio_tv_to_full_screen.pdf
    • https://uploads.strikinglycdn.com/files/0b64ca54-a269-40a3-886d-808f2dee13ed/finudejoxojanixatef.pdf
    • https://uploads.strikinglycdn.com/files/37e573f6-ba2c-41a0-a5c9-eb40b0171b55/what_burns_more_calories_than_jogging.pdf
    • https://uploads.strikinglycdn.com/files/e5d429f6-cde9-42fb-ad85-de339d4c7cc7/can_you_bypass_a_fuel_shut_off_solenoid.pdf
    • https://uploads.strikinglycdn.com/files/76835e69-7e92-46b6-b8dd-e3d01d2eede1/fisher_price_luv_u_zoo_jumperoo_instruction_manual.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_off0000d435.bin
5f7a18673237ab15c67b6f3328fd8ddd91835f040a347ac06b3e8b667a18198f
pdf-font-stream PDF embedded font (sfnt) at offset 0xD435 5512 bytes
font_01_sfnt_off0000e6cf.bin
9fb4f43e2cead44e40eed530f49443d851d0f71a0dbeaf8ae1c59e22ff457d45
pdf-font-stream PDF embedded font (sfnt) at offset 0xE6CF 10308 bytes