Malicious PDF — malware analysis report

Static analysis result for SHA-256 bfc414bbd6a75cac…

MALICIOUS

PDF

74.1 KB Created: 2021-03-03 18:32:54 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: 427652181e5a3114985a07fecd943524 SHA-1: 70cb2e390f6238ef0683e3e13f02357254054466 SHA-256: bfc414bbd6a75cac99f5067d6b23a1a40c70af5f5fd18c5ca59eb2da9aef5977
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous external URIs pointing to disposable domains and link farms, suggesting a phishing or malware distribution scheme. The embedded URLs and the nature of the heuristics, such as PDF_SEO_DISPOSABLE_LINK_FARM, strongly suggest the document is designed to redirect users to malicious 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
  • 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://jumiwimov.ru/strik?utm_term=list+of+dow+jones+symbols PDF link annotation
    • http://towufato.mywebcommunity.org/xogefafosari.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4444649/normal_5fcd7fd9c3d94.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4370284/normal_5fe11015279f3.pdfIn PDF document text
    • http://fejavodexata.getenjoyment.net/sujepokogigeloxijumali.pdfIn PDF document text
    • http://rugegav.mywebcommunity.org/17466180210.pdfIn PDF document text
    • http://viniveba.mywebcommunity.org/fluke_77_vs_177.pdfIn PDF document text
    • http://zonerokemub.getenjoyment.net/jatuwikumufun.pdfIn PDF document text
    • https://cdn.sqhk.co/kutajanode/0jaPgjv/nemize.pdfIn PDF document text
    • http://xifadezuzurap.medianewsonline.com/how_to_make_simple_html.pdfIn PDF document text
    • http://zimezobot.getenjoyment.net/how_many_points_do_you_need_to_pass_nys_driving_test.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4443326/normal_603a54e35a9f8.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/wegugus/17279690180.pdfIn PDF document text
    • https://s3.amazonaws.com/jafujasiwetid/21933493419.pdfIn PDF document text
    • https://s3.amazonaws.com/kimone/flat_sheet_reflector_antenna.pdfIn PDF document text
    • http://gosaduzunake.myartsonline.com/monster_vs_aliens_full_movie_in_hindi_dubbed_watch_online.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_off0000e50e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE50E 5096 bytes
SHA-256: 2786486fc4d7d6e8b17deabe21abaeb5bd0539e15e3f23e4362683eda8a4982c
font_01_sfnt_off0000f676.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF676 10872 bytes
SHA-256: 4c49562c51ca8117f8bce964adfbbb0a0e31a977792af2e14591bc97eed259b2

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