Malicious PDF — malware analysis report

Static analysis result for SHA-256 53eba152430bda9c…

MALICIOUS

PDF

77.1 KB Created: 2021-02-24 18:40:18 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-12
MD5: d4c09ca3a47c5d7efeb12a11f67d7819 SHA-1: 817cec4632ed0021460b03e37c8054217d808e98 SHA-256: 53eba152430bda9cf44bfe8ea3020550f5789b3fc2d7a35402b2128e31c29195
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to disposable domains, indicating a link farm or phishing attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. Although no scripts were extracted, the presence of many external links and the PDF structure itself points towards a phishing or malware distribution vector, likely initiated via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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=capresso+infinity+coffee+grinder+manual PDF link annotation
    • http://letxxnx.org/54216751810hu1r8.pdfIn PDF document text
    • http://virenoveza.22web.org/android_backup_app_data_with_root.pdfIn PDF document text
    • http://rowowesofazov.medianewsonline.com/33373187469.pdfIn PDF document text
    • http://sungo1.space/the_blackness_of_blackness_summarywl279.pdfIn PDF document text
    • http://raguvigawak.mypressonline.com/watch_jack_reacher_2016_movie_online.pdfIn PDF document text
    • http://creamwalls.online/gupuzonepuomed0.pdfIn PDF document text
    • https://cdn.sqhk.co/jusitufugaf/Zugjbgd/99535409499.pdfIn PDF document text
    • http://winoxolupuvil.getenjoyment.net/network_support_interview_questions_and_answers_for_l1_level.pdfIn PDF document text
    • http://nogurufegu.mygamesonline.org/67184025281.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://repibikapowa.epizy.com/voxozak.pdfIn PDF document text
    • http://zutotakome.epizy.com/auditing_free.pdfIn PDF document text
    • http://satanira.rf.gd/free_printable_comprehension_worksheets_year_5_uk.pdfIn PDF document text
    • http://kezepinaxozegom.epizy.com/appraisal_questions_and_answers_for_nurses.pdfIn PDF document text
    • http://japubonaxepesi.rf.gd/keystroke_tracker_free.pdfIn PDF document text
    • http://tefetuzuzip.myartsonline.com/everstart_jump_starter.pdfIn PDF document text
    • http://kepofif.onlinewebshop.net/how_much_does_a_retired_coast_guard_make.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_off0000f05d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF05D 5484 bytes
SHA-256: 7f8174c3e4b010790c8bfe4ebf0db49fab3dea6f4305b5d9ac57bb3b31715816
font_01_sfnt_off000102f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102F7 10644 bytes
SHA-256: 23eb83658565efc58a2a0129bc7e4032f8df9aadcc78ad837c52284a9dd72901

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