Malicious PDF — malware analysis report

Static analysis result for SHA-256 2456a21ad2423c78…

MALICIOUS

PDF

108.1 KB Created: 2021-03-10 11:45:33 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-16
MD5: 453892202420f253db905560d3b27a31 SHA-1: e57d36b5f5fca53a16d09c84c16714eaa0972a62 SHA-256: 2456a21ad2423c7827496d377c500bc37c3961e40f8c520422cf5dbc42053c42
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 trojan. It contains numerous embedded URLs, many of which point to disposable domains and are indicative of a link farm designed to redirect users to potentially harmful content. The document body, though heavily obfuscated, contains metadata related to wkhtmltopdf, suggesting it was generated programmatically.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://leonvi.ru/award?keyword=adenomas+hipofisarios+funcionantes+y+no+funcionantes+pdf PDF link annotation
    • http://rekugegik.scienceontheweb.net/610_tractor_for_sale_gumtree.pdfIn PDF document text
    • http://linodogeb.scienceontheweb.net/11301086192.pdfIn PDF document text
    • http://zupaxowo.22web.org/3d_photo_android_app.pdfIn PDF document text
    • http://zabemaladameg.medianewsonline.com/61214495080.pdfIn PDF document text
    • http://dasonudulikuvon.22web.org/61695966750.pdfIn PDF document text
    • http://kamefutebiwef.mywebcommunity.org/30741938263.pdfIn PDF document text
    • http://barajofa.mywebcommunity.org/59925813263.pdfIn PDF document text
    • http://tuduvodakep.mypressonline.com/40788647895.pdfIn PDF document text
    • http://siwelulatur.22web.org/nazaxepomope.pdfIn PDF document text
    • http://doworevo.22web.org/benign_prostatic_hyperplasia_clinical_practice_guidelines.pdfIn PDF document text
    • http://befujukipepejem.mygamesonline.org/kutufapek.pdfIn PDF document text
    • http://norasuzajo.mywebcommunity.org/titanium_piano_sheet_music_easy.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://zitulogakapede.myartsonline.com/2017_ap_stats_frq_answers_5.pdfIn PDF document text
    • https://391e4f24-9fc9-4707-ac06-338edcd9f959.filesusr.com/ugd/110ef3_bb6e6a9811764ff4a3eecf2a6afa86af.pdf?index=trueIn PDF document text
    • http://bazogito.epizy.com/top_20_romance_books_2020.pdfIn PDF document text
    • http://xuvekixofeku.onlinewebshop.net/66610971985.pdfIn PDF document text
    • http://xiwozoget.atwebpages.com/50917615341.pdfIn PDF document text
    • https://47ab6ce1-aee6-4086-a8e7-31fe393d2411.filesusr.com/ugd/afbef4_06f38e6124ba47f4b623b9cdda356abe.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/xarojapi/best_android_for_galaxy_s5.pdfIn PDF document text
    • https://75ca6b5e-a470-4e0e-8004-b00a9f1721b4.filesusr.com/ugd/1e4819_1f258577f2e043049c6bc4045d84854a.pdf?index=trueIn PDF document text
    • http://gakamaxoluzes.atwebpages.com/liftmaster_formula_1_wifi.pdfIn PDF document text
    • http://mijovutotukedes.onlinewebshop.net/habitat_for_humanity_volunteer_application.pdfIn PDF document text
    • http://saluwagasa.onlinewebshop.net/veg_sabji_recipes_for_dinner_in_marathi.pdfIn PDF document text
    • https://s3.amazonaws.com/farowug/tifedutavegovoj.pdfIn PDF document text
    • https://s3.amazonaws.com/befafuni/free_budget_template_personal.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_off00015dae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15DAE 5456 bytes
SHA-256: f150d49c0e736385defa0dc7053f1fcbd655e455a64d0e125a3d50e7d322c658
font_01_sfnt_off0001701a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1701A 16020 bytes
SHA-256: f8e9bed2028c741c9db2c028ab400b621da101ebe80bee6a23b5ea810747c1e8

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