Malicious PDF — malware analysis report

Static analysis result for SHA-256 96c45851c11898ca…

MALICIOUS

PDF

81.2 KB Created: 2021-04-09 01:31:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-02
MD5: 57865346d59b07d3388e7bf276928529 SHA-1: eb99d689405f21623f005ebd354c30887a051999 SHA-256: 96c45851c11898ca367faec98accfdeee40cee72b5a092ccf1e729f8e7a6fad9
126 Risk Score

Malware Insights

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

The PDF contains numerous external URIs, with many pointing to disposable domains and acting as a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. Although no scripts were explicitly extracted, the PDF structure and embedded URLs suggest it's designed to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://zajinet.ru/strik?utm_term=master+mantak+chia+london+real PDF link annotation
    • http://naturebiolog.fun/five_elements_of_good_writing6lp74.pdfIn PDF document text
    • http://kovuzaxaf.medianewsonline.com/88668138419.pdfIn PDF document text
    • http://alkostore.xyz/variador_yaskawa_a1000_manual6zvkx.pdfIn PDF document text
    • http://dream-stat.ru/33463279685iefnz.pdfIn PDF document text
    • http://graatorama.fun/dell_studio_1737_ram_upgrade6d3d4.pdfIn PDF document text
    • http://mrshadow.net/oracle_database_12c_installation_on_linux_78wssh.pdfIn PDF document text
    • http://asta-stroy.ru/gazeta_shekulli_ne2mn15.pdfIn PDF document text
    • http://tijudozi.scienceontheweb.net/corsair_commander_pro_setup.pdfIn PDF document text
    • http://hardcreditcheck.info/896687081411w5c3.pdfIn PDF document text
    • http://citimart.online/loxoxojinebo79j8x.pdfIn PDF document text
    • http://ruwufuwetoj.mygamesonline.org/algebra_worksheet_grade_7.pdfIn PDF document text
    • http://vamoktin.ru/506986993490qq0j.pdfIn PDF document text
    • http://radogomi.mygamesonline.org/48592790069.pdfIn PDF document text
    • http://xufuzema.sportsontheweb.net/a_practical_approach_on_the_statistical_learning_theory.pdfIn PDF document text
    • http://busforpay.online/schwinn_recumbent_bike_seatz197d.pdfIn PDF document text
    • http://tubesebove.medianewsonline.com/15233530097.pdfIn PDF document text
    • http://eu-study.ru/sumoloresg59em.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/dinilederu/fix_authentication_error_on_android.pdfIn PDF document text
    • https://s3.amazonaws.com/liluvad/coleman_powermate_1850_generator_reviews.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e5d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5D8 7128 bytes
SHA-256: 154dfa70677709737afe1709f45014d8bf4846ffa12f207db8dd5d99c3b920ff
font_01_sfnt_off0000fdc3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDC3 5248 bytes
SHA-256: 5c1a5370cae1073998e02e4bbd46e5e294b6f41e8be3bae7c03f774bd481ffef
font_02_sfnt_off00010f78.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F78 11544 bytes
SHA-256: d9da5d1abcac44611630908ed12a8ea6ef094da7282b75ee50b4cd8d3df04722

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