Malicious PDF — malware analysis report

Static analysis result for SHA-256 3526708de9032a82…

MALICIOUS

PDF

76.1 KB Created: 2021-05-21 18:41:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0a8ddb403751a1c8b07b2bf926dd5fb3 SHA-1: eb7ce8dea5b4008c0d84e2b29b3f528215f3ae7b SHA-256: 3526708de9032a82a5bdecebfd561854272091dfc91b7d8ca83df2fccca1b54f
136 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The 'SE_BROWSER_INSTALL_LURE' heuristic suggests the document is designed to trick the user into installing a fake browser update or extension. While no scripts were extracted, the embedded URLs and the nature of the lure point towards a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Browser extension / update installation lure high SE_BROWSER_INSTALL_LURE
    Document tells the user to install a browser extension, plugin, viewer, or browser update to view content — a common social-engineering path for credential theft and malware installation
  • 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://cdn-cms.f-static.net/uploads/4368745/normal_600fadd4bc7e4.pdf
    • https://static.s123-cdn-static.com/uploads/4467273/normal_5fe39508eb968.pdf
    • https://cdn-cms.f-static.net/uploads/4456686/normal_601b05ff1fde2.pdf
    • https://static.s123-cdn-static.com/uploads/4482882/normal_5fc5be8b90c11.pdf
    • https://cdn-cms.f-static.net/uploads/4446151/normal_604f597d3fae4.pdf
    • https://cdn-cms.f-static.net/uploads/4455684/normal_6035f4d0acac1.pdf
    • https://static.s123-cdn-static.com/uploads/4426545/normal_5fdda30c664c0.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://feedproxy.google.com/~r/wb/ENAH/~3/0IJhScypsXo/wb?keyword=jupyter%20notebook%20dark%20theme%20name
    • https://uploads.strikinglycdn.com/files/0307657d-dd17-43f9-a766-86d06ecee78c/where_is_the_filter_on_a_maytag_bravos_xl_washer.pdf
    • https://uploads.strikinglycdn.com/files/d4add66f-50dc-447b-b8d2-805dcbed6235/pleasant_hearth_pellet_stove_igniter_problems.pdf
    • https://uploads.strikinglycdn.com/files/e6410798-89a9-46d2-bbaa-686a5a960e11/how_to_jump_attack_dark_souls_2_keyboard.pdf
    • https://uploads.strikinglycdn.com/files/31ae02b2-fa6e-46e3-88b6-203028268daf/76025391741.pdf
    • https://uploads.strikinglycdn.com/files/4e515edd-81fe-4cc9-af14-cb39b2b5e944/97464013583.pdf
    • https://uploads.strikinglycdn.com/files/4c67e4dd-6453-4006-9d92-f60bc132f783/casio_watch_5208_set_time.pdf
    • https://s3.amazonaws.com/wovedukevikov/ragewam.pdf
    • https://uploads.strikinglycdn.com/files/f6a1a17f-b2a0-42b2-a0dc-8d7edd881588/honda_eb5000x_parts_manual.pdf
    • https://s3.amazonaws.com/sorapobuk/smiths_bible_dictionary.pdf
    • https://s3.amazonaws.com/lorugipopuxe/autocad_2d_building_drawing.pdf
    • https://s3.amazonaws.com/lijulijowivaze/best_sports_live_tv_app_for_android.pdf
    • https://uploads.strikinglycdn.com/files/8524cfaf-d92c-429f-8098-35e7286d06eb/adca_computer_course_notes_in_hindi.pdf
    • https://uploads.strikinglycdn.com/files/206c5cec-6539-4493-8a17-455d0f5b5575/memnoch_the_devil_ending_explained.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_off0000e9ce.bin
50ea43165b33febc43d4122892ed33b5392d2ee260fc1cd4fb48a563de2f2709		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE9CE 5284 bytes
font_01_sfnt_off0000fb9f.bin
167df8a904ffed07f727b333e12b475c85d116bae79226338755a9198f73cbff		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFB9F 11076 bytes

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