Malicious PDF — malware analysis report

Static analysis result for SHA-256 1db18c12e793fa13…

MALICIOUS

PDF

79.5 KB Created: 2021-04-25 17:31:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: f97311a25a51566cc79a4b911b39b728 SHA-1: 6b5fb7fa3efff71da33a6a9df687d3fc8631d768 SHA-256: 1db18c12e793fa13d48d0526648c3e9ccc6837bb9e95743c6dc219c94efbe62f
126 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs, with a significant portion pointing to disposable hosting and employing UTM parameters, indicative of a link farm or phishing campaign. The ML classifier and ClamAV detection strongly suggest malicious intent, specifically phishing. The presence of external URIs and a link farm heuristic further supports the conclusion that this document is designed to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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://kuzutuzo.ru/strik?utm_term=junior+software+testing+jobs+near+me PDF link annotation
    • http://tehnopolis.org/regevxqs54.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4386834/normal_6023a9385cb64.pdfIn PDF document text
    • http://artemk.ru/android_room_delete_all_itemssoy6d.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4482027/normal_5ff2861b52e22.pdfIn PDF document text
    • http://uscarinsurance.info/26355438290xt708.pdfIn PDF document text
    • http://hydrofthol.space/wisepelarexebuduroluget7juhm.pdfIn PDF document text
    • http://petersikdar.com/woboxutubexemiguxugobx759g.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4469116/normal_5ff776310d453.pdfIn PDF document text
    • http://interplast.ru/785124358868lcne.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/12be7e19-e7ee-4a10-a23e-8c14da6499aa/how_to_get_funding_for_a_nonprofit_organization_in_south_africa.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/28e28e7c-143d-459d-9514-9962ea0ea8d7/64297711706.pdfIn PDF document text
    • https://s3.amazonaws.com/jadere/how_can_i_reset_my_hikvision_camera_password.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/328f72e0-cf27-418a-aaae-df61b6a1bb92/18914869495.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2151faa5-8f0c-4115-8549-37f88c6f3416/jusaratisakobotokufe.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/745d94f5-350d-41fe-a1b2-b9d4956c72e7/whats_better_mini_14_or_mini_30.pdfIn PDF document text
    • https://s3.amazonaws.com/dibedamoka/87984247383.pdfIn PDF document text
    • https://s3.amazonaws.com/feseni/legal_definition_of_law.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ab733953-5ac0-42bb-99bd-48fe48cbf9d6/how_to_turn_iphone_off_silent_mode_without_switch_ios_13.pdfIn PDF document text
    • https://s3.amazonaws.com/fowonaxul/14118111172.pdfIn PDF document text
    • https://s3.amazonaws.com/zamuriza/stihl_backpack_blower_br600_parts.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/82507359-6006-4d2a-af25-c0cbc5269c33/annovi_reverberi_pump_unloader_valve_adjustment.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c63b4807-684b-424b-b7e3-ea60dc13761c/4666606291.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_off0000ebac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBAC 5352 bytes
SHA-256: 2291c12d678d9ca19adadbf76897743e5631ebed83e85db690547e55b1e175f1
font_01_sfnt_off0000fde1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDE1 20128 bytes
SHA-256: c6d698dca23da6f688a8df317e436f4a1b52ba6b31b3187824c67e4d7cc92ab8

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