Malicious PDF — malware analysis report

Static analysis result for SHA-256 f82d2193ed028ac2…

MALICIOUS

PDF

80.5 KB Created: 2021-03-28 07:41:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 82057f48c1e02bd7b32286cfc7ce7f51 SHA-1: 76de42d42e1a39f991db6ee1523e759937511dd1 SHA-256: f82d2193ed028ac203918f2620ee83f965ff50aacd56eaa18e318567cdf14f5e
184 Risk Score

Malware Insights

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

The PDF contains multiple embedded URLs, with several pointing to known malicious redirectors or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or scamming purposes. While no scripts were explicitly extracted, the PDF structure and embedded links are indicative of a malicious document designed to lure users to harmful sites.

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://yafferge.ru/award?keyword=apert+syndrome+review+pdf In PDF document text
    • http://helplnstagramcontact5087423.com/pikilakebfad4.pdfIn PDF document text
    • http://copyrightsupporthelpcenter.com/android_vs_ios_2019_statisticsfpuk6.pdfIn PDF document text
    • http://beststudent.space/wurowinariwadorebebelr1gjy.pdfIn PDF document text
    • http://kuzexamipapoxip.medianewsonline.com/nutrition_facts_taco_bell_bean_burrito_no_cheese.pdfIn PDF document text
    • http://shopeuro.pro/zeny_cut_50_plasma_cutter_manualb9vmc.pdfIn PDF document text
    • http://vadosaj.getenjoyment.net/67547488865.pdfIn PDF document text
    • http://catsism.com/penuxuliwakevigujizoeqc4q.pdfIn PDF document text
    • http://slmit.fun/nuregupofadutelukanozimd5t4f.pdfIn PDF document text
    • http://yblda.fun/nifave2kxgh.pdfIn PDF document text
    • http://parkingtest.xyz/workkeys_test_resultsslnba.pdfIn PDF document text
    • http://fegebekuxew.22web.org/3d_font_photoshop_template.pdfIn PDF document text
    • http://ingmijn.com/wozigok5i7p5.pdfIn PDF document text
    • http://kovamuwaropepu.getenjoyment.net/xiribalemetigip.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://zaxuzut.atwebpages.com/amadeus_gds_training.pdfIn PDF document text
    • https://s3.amazonaws.com/gozifep/the_heirs_korean_drama_plot_summary.pdfIn PDF document text
    • http://dexizijisub.atwebpages.com/51228328899.pdfIn PDF document text
    • http://tuxefofoxomar.epizy.com/mini_dv_player_adapter.pdfIn PDF document text
    • https://s3.amazonaws.com/lixasifasi/color_sheets_for_kindergarten_students.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e543.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE543 5188 bytes
SHA-256: 6d6417e8c6631289958af38a03fa14a89c832a1d8d9b8d0ea9a03062f9dd517f
font_01_sfnt_off0000f6f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6F6 11880 bytes
SHA-256: 894303bc52e31e5238e67a1e28d5da911ea524a1b98aa533136eeca99cf9095a
font_02_sfnt_off00011e68.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E68 16060 bytes
SHA-256: 2173a1880e9f774f759393e7d0d28dda91d04d8a3eae6bea41b822770b343b90