Malicious PDF — malware analysis report

Static analysis result for SHA-256 3f48ff82bf49c93c…

MALICIOUS

PDF

88.1 KB Created: 2021-04-05 17:46:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 8e4957d654b259a9e2d24a2169258ddb SHA-1: 5988be8a237085077bf06d77344e6985ff585851 SHA-256: 3f48ff82bf49c93c1ea9d73530bb3a99b93179368a9732b3bd359ff7c3298159
126 Risk Score

Malware Insights

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

The PDF contains a high density of embedded links pointing to disposable domains, a common tactic for phishing and malware distribution. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or credential harvesting. Although no scripts were explicitly extracted, the PDF structure and numerous external URIs suggest it's designed to redirect users to malicious sites, potentially for further exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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/123?utm_term=classification+methods+in+data+mining+pdf PDF link annotation
    • http://pasetbs.xyz/fogunilibogokojugoxummmpm5.pdfIn PDF document text
    • http://kusufuxufatup.getenjoyment.net/50071885120.pdfIn PDF document text
    • http://sportita.fun/option_trading_strategies_for_beginners_in_indian_marketo96cg.pdfIn PDF document text
    • http://mydenverneighborhoods.com/the_other_side_lyrics_jason_derulo_tattoosto75d.pdfIn PDF document text
    • http://gizesodawesiv.mywebcommunity.org/cbse_class_10_english_language_and_literature_textbook_download.pdfIn PDF document text
    • http://7gusevshop.space/faith_reformed_baptist_church_mediayqr4e.pdfIn PDF document text
    • http://xadexawufomovi.sportsontheweb.net/catalogo_filtros_tecfil.pdfIn PDF document text
    • http://fitokaps.xyz/5828395853nvqan.pdfIn PDF document text
    • http://lofoporubatul.mygamesonline.org/98931511302.pdfIn PDF document text
    • http://fudoviwil.mywebcommunity.org/85744557502.pdfIn PDF document text
    • http://mmuuue.space/apple_developer_enterprise_program_license_agreement_has_been_updatedlcrhq.pdfIn PDF document text
    • http://fanuvazav.scienceontheweb.net/dixedenomeparinigulamos.pdfIn PDF document text
    • http://tarekupi.scienceontheweb.net/chromatic_harmonica_notes.pdfIn PDF document text
    • http://procripton.com/75786420775g7704.pdfIn PDF document text
    • http://getcreditreport.info/3929306379eq9fy.pdfIn PDF document text
    • http://itanto.space/durosofijaguxeo8ip.pdfIn PDF document text
    • http://sun-italy.space/used_coleman_hot_tub_partsq8p27.pdfIn PDF document text
    • http://mereritijazos.scienceontheweb.net/99120932150.pdfIn PDF document text
    • http://timinome.getenjoyment.net/raxem.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/gumegulaxi/rules_for_writers_7th_edition_publication_date.pdfIn PDF document text
    • https://s3.amazonaws.com/tometubufimopim/dolibuxuxibi.pdfIn PDF document text
    • https://s3.amazonaws.com/sepawi/free_soft_music_ringtones.pdfIn PDF document text
    • http://wawikoduvebakap.onlinewebshop.net/essentially_contested_concepts_gallie.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_off00010cdd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CDD 5284 bytes
SHA-256: 261c9f739267636cf6292221a835c12ffda257998d0964881682ee5315a15944
font_01_sfnt_off00011ead.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11EAD 11000 bytes
SHA-256: 599d76f72046b3c3c10f2817c7c37dfebf902e2a56e81f97a7c58be91ac1e919
font_02_sfnt_off00014412.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14412 4324 bytes
SHA-256: ce7e2e230a41ba6fc2d7d2240890c8289d67876d84a3d076d67c0b48111c8230

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