Malicious PDF — malware analysis report

Static analysis result for SHA-256 9b8215e7fd6a33cc…

MALICIOUS

PDF

69.9 KB Created: 2021-05-26 23:48:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: 584ce35dfa83b70ad791c3fd615471a8 SHA-1: 6bd818389a7f12df6fb067f24a4e5fc535dfba0a SHA-256: 9b8215e7fd6a33cc17388dd9139e32b415d7fe74aabe6ec9a6bb8bf62278bff0
96 Risk Score

Malware Insights

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

The file is identified as a malicious PDF by multiple heuristics and a machine learning classifier. It contains an embedded URI pointing to a suspicious domain, 'jumiwimov.ru', which is likely used to host a phishing page or a second-stage payload. The PDF structure itself is also flagged for duplicate object bodies, indicating potential obfuscation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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/strik?utm_term=aectp+230+pdf PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4369179/normal_5ff8c6562c834.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4414501/normal_6055735d0da96.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4448540/normal_604203c2a7a6d.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4416653/normal_5fca4678a9fd0.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4416131/normal_6000348ba5576.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4488566/normal_60664d30d5da4.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/396764f7-39a8-4bb0-a4f3-59367ecc3e44/air_force_one_plane_type.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/dbe4e30c-990f-4d89-b240-446c437d12d8/30649119576.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1c40fd65-b70e-47e3-af8b-419bfed1a139/47320349549.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/dc475e15-245b-4ce4-b4ab-237f1ebd50e2/50842812658.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bc9ce11a-d597-4156-a1cc-fe24b31ddc92/monster_2014_dramacool.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/59aa1705-3fa6-4523-b6dd-6841d4ab70fe/844459471.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2dce1f7c-e7b0-4e0b-94bc-09eb012d5e5f/how_to_install_rpcs3_emulator_on_pc.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a42e3c58-7f84-4ed1-b91e-2228e9fcb382/el_caballero_de_la_armadura_oxidada_personajes_principales_y_secundarios.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/94d79bbc-7d70-4a8e-a03e-89996bf8d8c7/the_penguin_rogets_college_thesaurus_in_dictionary_form.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b764e6f2-05a8-4116-9521-141d7be4e32a/what_was_the_purpose_of_the_four_freedoms_speech.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b8b2fed1-4f61-4103-9ae1-32a82bcefc4e/komama.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/25ae4b88-1934-457a-b96e-c572ba265380/video_gekiranger_vs_boukenger_sub_indo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/16f765e0-9ede-4b49-ba5d-b9a9497074b5/kovirilisokifuz.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ca73ca78-cb5d-4503-9220-6824158852eb/is_the_600_watt_nutribullet_good.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7d9c2d70-c011-4054-bc45-eeeb4dceeb81/maxi_cosi_mico_ap_infant_car_seat_installation.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/24485146-e096-4a75-b863-39908ff8547b/what_does_the_national_anthem_represent_for_american_citizens.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ea2ccb54-9405-4a3d-b4db-c542d1af57d1/33791180570.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_off0000d46f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD46F 5060 bytes
SHA-256: 3773cfdf6e03e6f0aa0ab836515e9be047c6a99317b1da7868dae38743b7b312
font_01_sfnt_off0000e5d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5D6 10768 bytes
SHA-256: 6602482c92e6e3a327b8a5151876778723ccedc93ccdd25ffce86dd24fff74f2