Malicious PDF — malware analysis report

Static analysis result for SHA-256 be780ce21f8aed2a…

MALICIOUS

PDF

75.7 KB Created: 2021-04-27 17:04:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-02
MD5: f86f1486e659650513035effaa06bac5 SHA-1: 3a1d8be6ec155c4f68f09caff77b32c341e9fbfa SHA-256: be780ce21f8aed2a8e20fdce425920d801461ff4bff1085c72d1c2159a46a33f
126 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier, indicating malicious intent. It contains numerous embedded URLs pointing to disposable domains, suggesting a link farm designed to redirect users to potentially malicious content. The document body, though partially corrupted, contains text related to 'legal definition of oral contract' and application metadata, which likely serves as a lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://mezovuduw.ru/strik?utm_term=legal+definition+of+oral+contract PDF link annotation
    • http://goshop32.site/safety_glasses_for_covid_canadag7ych.pdfIn PDF document text
    • https://fofebufog.weebly.com/uploads/1/3/4/7/134738758/ratiropetuker.pdfIn PDF document text
    • http://vorecan.space/jifeji7jay8.pdfIn PDF document text
    • http://gaydating.world/kidney_coloring_structure_of_the_nephron_answersc7oql.pdfIn PDF document text
    • https://mivujekosos.weebly.com/uploads/1/3/1/6/131637271/9917186.pdfIn PDF document text
    • http://leftoutclub.com/las_chicas_de_alambre_personajes_principales0hins.pdfIn PDF document text
    • http://natorg.fun/fiasco_rpgvpyqu.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4490116/normal_5ff086ecc3f1b.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4384048/normal_5fcea3ac2108f.pdfIn PDF document text
    • http://soldatskaya6.ru/sslc_marksheet_registration_number_ssch84j6.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4401973/normal_5ff8996d4c7c7.pdfIn PDF document text
    • http://securespot.ru/simile_and_metaphor_worksheet_2_answerspuycq.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403557/normal_6013a17e2557b.pdfIn PDF document text
    • http://reduslim-shopofficial.site/80704225024aw0lp.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4465908/normal_60304cec37c4a.pdfIn PDF document text
    • https://bevabuje.weebly.com/uploads/1/3/4/8/134897483/1210615.pdfIn PDF document text
    • https://fegesimi.weebly.com/uploads/1/3/5/3/135341766/bedukibekaxu_deforikar.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4404299/normal_6052847a1f160.pdfIn PDF document text
    • https://rilobajivevet.weebly.com/uploads/1/3/1/4/131438099/802149.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4500692/normal_5feb31a5f30d0.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/vuzotisenixava/converging_and_diverging_lenses_worksheet_tes.pdfIn PDF document text
    • https://s3.amazonaws.com/donake/formative_assessment_feedback_template.pdfIn PDF document text
    • https://s3.amazonaws.com/goneduzum/fnma_appraisal_form_216.pdfIn PDF document text
    • https://s3.amazonaws.com/robumuduluwise/23876130365.pdfIn PDF document text
    • https://s3.amazonaws.com/jewizopukuni/91127098801.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_off0000ec32.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC32 4952 bytes
SHA-256: aaf016644f47b7813cb0f616cb67a40b259caf4f96b38464fcee09ceb3b67af6
font_01_sfnt_off0000fd24.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD24 10204 bytes
SHA-256: 2af0221625580b1c167a2ba656f1d367aba926baeb415912a37fcbb84fe6933d

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