Malicious PDF — malware analysis report

Static analysis result for SHA-256 60157140e3958910…

MALICIOUS

PDF

91.8 KB Created: 2021-03-24 20:03:13 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: be12771a523e7b0fd35bc20372ae1a0a SHA-1: 4afe3502b5f5a1fa3eeef07b034b1d6e59cfdee2 SHA-256: 60157140e3958910232650299df1e3ebd1c66fb07e57687b473686e9ac448568
126 Risk Score

Malware Insights

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

The PDF file is detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan payload. It contains numerous embedded URLs, many pointing to disposable domains, suggesting a link farm designed to redirect users to malicious content. The document body, though heavily obfuscated, appears to be a lure related to educational materials.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://nipisod.ru/strik?utm_term=density+worksheet+physical+science+if8767+answers PDF link annotation
    • http://amorexpo.com/wood_laminate_sheets_home_depot1c0wx.pdfIn PDF document text
    • http://punalat.22web.org/17837909974.pdfIn PDF document text
    • http://maladametugal.iblogger.org/66807081079.pdfIn PDF document text
    • http://nivulegojin.iblogger.org/vovorixepenus.pdfIn PDF document text
    • http://shop50off.info/cuantos_dias_de_vacaciones_tiene_un_trabajadorhbph2.pdfIn PDF document text
    • http://vzroslyh.net/86009659728cq0h0.pdfIn PDF document text
    • http://kenugizi.getenjoyment.net/89393665183.pdfIn PDF document text
    • http://tameeniraq.com/2012_jeep_grand_cherokee_brake_light_bulbho8n5.pdfIn PDF document text
    • http://uggi-ugg.com/flammable_cabinet_guidelinest0ep6.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/dovulavavo/ets_gre_practice_test_1_answers.pdfIn PDF document text
    • http://tajavuminona.atwebpages.com/xotofepokub.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/282fc660-efe5-4ab8-bfa8-7857ca400853/film_script_format.pdfIn PDF document text
    • http://vekelelavalu.epizy.com/lufiwofifubakivolib.pdfIn PDF document text
    • https://s3.amazonaws.com/rabewiruzitewa/bronson_haley_performance_transport.pdfIn PDF document text
    • http://diwuvugu.epizy.com/graphic_organizer_definition.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/01579d35-4596-4865-98da-c2b84d6ae8bb/8740099631.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9de9d2dd-5cb9-4038-b54c-071930acce54/71013770307.pdfIn PDF document text
    • https://s3.amazonaws.com/nigimul/38444368265.pdfIn PDF document text
    • https://s3.amazonaws.com/xakajoziwibi/m_audio_fast_track_ultra_8r_manual.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bd7aec4f-322f-4e16-a95f-6c111e8553ac/applications_of_big_data_analytics.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/87ecf134-555d-4345-b9fc-be4bc038e1c3/are_baby_bullet_parts_dishwasher_safe.pdfIn PDF document text
    • https://s3.amazonaws.com/goveruduzewoxu/the_selection_netflix_movie_auditions.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_off00012766.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12766 5788 bytes
SHA-256: 94f34354450a4a0cfb70a3ac4860735a8009949c842fef8f553b66b27266de30
font_01_sfnt_off00013b3a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13B3A 11220 bytes
SHA-256: 9979e4ffc1cc503154d8ab4b42458be73177619eacc8a4b25ab94322f4daa2de

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