Malicious PDF — malware analysis report

Static analysis result for SHA-256 100aa9dd0d83ce53…

MALICIOUS

PDF

82.1 KB Created: 2021-04-01 14:50:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: d988d83410d12d106ebf4dfc523d04be SHA-1: 55d7bedc1cc4bd0f3ecd4f46efcd3fdc50f5a258 SHA-256: 100aa9dd0d83ce53b9f1664a1b2d238c029b34f2b67eb3e9867bc0214935ea4f
126 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics, including a critical ClamAV detection for 'Pdf.Phishing.Trojan' and an ML classifier indicating high maliciousness. The document contains numerous embedded URLs, many pointing to disposable hosting or link farms, suggesting a phishing or malware distribution scheme. The presence of PDF_SEO_DISPOSABLE_LINK_FARM heuristic indicates a tactic to disguise malicious links as search results.

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://botokaw.ru/award?keyword=caida+libre+y+tiro+vertical+formulas+y+ejercicios+pdf PDF link annotation
    • http://mukinumatonewo.getenjoyment.net/92819927163.pdfIn PDF document text
    • https://gimipozadifan.weebly.com/uploads/1/3/1/3/131380487/dofenobip.pdfIn PDF document text
    • https://wakevilapiz.weebly.com/uploads/1/3/4/9/134903367/9111682.pdfIn PDF document text
    • http://betijeduw.getenjoyment.net/massey_ferguson_parts_list.pdfIn PDF document text
    • http://fexevewuli.mypressonline.com/nintendo_switch_video_games_2021.pdfIn PDF document text
    • https://gavedomosuzutu.weebly.com/uploads/1/3/4/2/134234743/9068895.pdfIn PDF document text
    • http://tomuxajitibog.iblogger.org/o_uraguai_baslio_da_gama_livro.pdfIn PDF document text
    • http://rirenanevigi.22web.org/how_to_do_guided_reading_in_kindergarten.pdfIn PDF document text
    • http://dizanuvusawowi.22web.org/apertura_inglesa_gratis.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://pekowob.onlinewebshop.net/barcelo_bavaro_palace_map.pdfIn PDF document text
    • http://wotonopeg.epizy.com/shoot_apical_meristem_formation_in_plants.pdfIn PDF document text
    • http://padanejelupe.rf.gd/how_to_use_baofeng_as_a_scanner.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/138ffb5a-9449-4f92-b0b3-c61cc9c31710/83571452773.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/764a0bef-1e7a-4969-af71-00de0b1ce36c/xiwavafekajapivuxuka.pdfIn PDF document text
    • http://medinivixajobo.rf.gd/how_to_say_japanese_in_chinese.pdfIn PDF document text
    • http://sanusowadatuj.epizy.com/49285981747.pdfIn PDF document text
    • http://pexirud.onlinewebshop.net/82866225095.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ac6cc2d9-1f63-4231-9e5d-4a3514601313/22907485923.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6d47abf4-2005-462b-b6cb-58a38f7d7cbc/second_hand_ice_cream_machine_for_sale_in_cape_town.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/737393cb-b396-4779-8c8e-3fd086808b46/how_to_make_topical_sermon_outline.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000efab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFAB 5476 bytes
SHA-256: 4ef70db1101af8c0ff1a3c8d7945c6a7fe11af775ee8ae47b4649e4e35f69dc4
font_01_sfnt_off0001025d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1025D 12452 bytes
SHA-256: 37ef7388187417f4927c5b60b9eaaf529c136f0294aa5d2d2b9742da5195d892
font_02_sfnt_off00012aaa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12AAA 4324 bytes
SHA-256: 1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361

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