Malicious PDF — malware analysis report

Static analysis result for SHA-256 b873a2b2a4b4e486…

MALICIOUS

PDF

78.5 KB Created: 2021-03-17 23:22:54 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-02
MD5: be64dcf14ed30cc6e3fb4bd745e90f3f SHA-1: 45951c08381f57653d83ce0788b4696af21118a3 SHA-256: b873a2b2a4b4e48614bae204b8d07c6fb99ccb43c30baad93a78ac6c69da2812
126 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing or trojan variant. It contains numerous embedded URLs, many of which point to disposable domains and are likely used to redirect users to malicious sites. The document body, though heavily obfuscated, appears to contain product-related keywords, suggesting a lure to disguise the malicious intent.

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
  • 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://seumenha.ru/aws?utm_term=panasonic+convection+grill+microwave+oven+nn-cd87ksbpq PDF link annotation
    • http://wugupomovupa.sportsontheweb.net/data_structures_with_c_schaums_outline_series_seymour_lipschutz.pdfIn PDF document text
    • http://sidufapas.mywebcommunity.org/new_headway_beginner_english_course_student_s_book.pdfIn PDF document text
    • http://kamefutebiwef.mywebcommunity.org/94952021897.pdfIn PDF document text
    • https://cdn.sqhk.co/suxavawudomo/h6BY4Uk/habit_tracker_and_to_do_list.pdfIn PDF document text
    • https://cdn.sqhk.co/rajunakeb/Qgdv8B9/vapenixuponugiro.pdfIn PDF document text
    • https://cdn.sqhk.co/nuxazagugura/ghhfsHO/fancy_fonts_cool_fonts_stylish_text_generator_apk.pdfIn PDF document text
    • http://juxasuromibejib.iblogger.org/rojefugokejaxudoji.pdfIn PDF document text
    • http://pefiworawodud.mypressonline.com/68971319005.pdfIn PDF document text
    • http://bijepitujutix.sportsontheweb.net/mathematical_statistics_with_applications_john_e_freund.pdfIn PDF document text
    • https://cdn.sqhk.co/figoveraboj/IEjgcjg/fun_stacky_jumper.pdfIn PDF document text
    • http://bubobimurasawe.iblogger.org/51853098134.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://vokesakogo.onlinewebshop.net/49185235984.pdfIn PDF document text
    • http://siromalezevupag.rf.gd/eq_p99_bard_guide.pdfIn PDF document text
    • http://bopiguxa.atwebpages.com/28215219151.pdfIn PDF document text
    • http://pimobepetokonud.myartsonline.com/ayodhya_kand_download.pdfIn PDF document text
    • http://kozogasivufi.myartsonline.com/best_oil_paint_for_alla_prima.pdfIn PDF document text
    • http://legokejapo.atwebpages.com/moultrie_trail_cameras_customer_service.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4ca56292-894f-4e43-9c45-e0f477b0a72b/sharepoint_2013_quick_reference_guide.pdfIn PDF document text
    • http://kedisijusa.onlinewebshop.net/nojafoxikukofivafoxapu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cb6a4a81-a03f-4fc4-909a-b441112396fc/99632082359.pdfIn PDF document text
    • http://merapenerabari.myartsonline.com/caballo_de_troya_tomo_1.pdfIn PDF document text
    • http://koxogulu.rf.gd/baptist_south_montgomery_al_patient_information.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_off0000f1ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1CA 6180 bytes
SHA-256: 0517445c3c9938276c174a9e3ea7a315581f5acc3a82e646d7956d29c9ce26c6
font_01_sfnt_off000106d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106D8 11352 bytes
SHA-256: 1484516ee9aaedd217754ed43da87f356dfbb9b5a8e513fb28e48c0d3bf64099

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