Malicious PDF — malware analysis report

Static analysis result for SHA-256 e98840cbba4c920e…

MALICIOUS

PDF

78.1 KB Created: 2021-03-14 05:30:27 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-30
MD5: 20c23cf9b9fa687dde6f0d8435ef2661 SHA-1: 8365309855b73b2b2d060d28886954511b034cb1 SHA-256: e98840cbba4c920e8322c48e16ecf96cf46d36fcecb28da6a5cff2d654ab2c06
126 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' suggests the document is part of a link farm hosted on disposable infrastructure, pointing towards phishing or malware distribution. The embedded URLs, such as 'https://midufefew.ru/strik?utm_term=how+to+calculate+turning+radius+of+road', are likely used 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://midufefew.ru/strik?utm_term=how+to+calculate+turning+radius+of+road PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4463286/normal_6044947251614.pdfIn PDF document text
    • http://mestorating.ru/the_lottery_comprehension_questions_answers68zps.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4465394/normal_5fe714ca36547.pdfIn PDF document text
    • http://mokaxizekebade.scienceontheweb.net/53569502825.pdfIn PDF document text
    • https://mirezavofuju.weebly.com/uploads/1/3/4/8/134870541/miseduka_tuweguditaniga_zinabifis.pdfIn PDF document text
    • https://nabusaguvelono.weebly.com/uploads/1/3/4/0/134095838/9c43e0ff699d.pdfIn PDF document text
    • http://copyrightreports.com/what_could_cause_a_washer_not_to_drainfyvqn.pdfIn PDF document text
    • http://kanaxade.mygamesonline.org/42681165130.pdfIn PDF document text
    • http://teatr-art.com/kawajoredlycf2.pdfIn PDF document text
    • http://avit0.cc/philips_norelco_series_9000_blades9pm2e.pdfIn PDF document text
    • http://idealica-tufficiale.website/city_drifters_2_game_online37wk9.pdfIn PDF document text
    • http://b0xberry.online/mcdonalds_breakfast_start_hours_ukv7ntp.pdfIn PDF document text
    • https://nefarixuk.weebly.com/uploads/1/3/1/4/131407944/segagumutegolun.pdfIn PDF document text
    • http://frasqen.online/bayliner_capri_1850_owners_manual2rfko.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4476446/normal_60411cc92d637.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374859/normal_60160127eb9a7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4422658/normal_6048c7aa5a69c.pdfIn PDF document text
    • http://dmdmassage.com/890505110utqho.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/somisilegex/87737811062.pdfIn PDF document text
    • https://s3.amazonaws.com/zuwosil/bollywood_movie_songs_free_sites.pdfIn PDF document text
    • http://jafixomedimun.onlinewebshop.net/gujalasomewakajixezosuva.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_off0000f2a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2A2 5240 bytes
SHA-256: 4aecd374b80e06b2f8946f1e8aa4acd10150eaa47bceaee8abf89fb1c785e633
font_01_sfnt_off00010495.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10495 11156 bytes
SHA-256: d71c9a8e86cc6e71c46dd47acbf501a81838cf1e0ce24e7842e26adbf282d748

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