Malicious PDF — malware analysis report

Static analysis result for SHA-256 28782b0c29e4c903…

MALICIOUS

PDF

74.3 KB Created: 2021-02-25 08:43:41 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-13
MD5: 74519e8e858ed32b85f7a5a20b420030 SHA-1: 7d977f9ff2bcffe4ddf75a3af5df1ab212c4859a SHA-256: 28782b0c29e4c903b9032394c71f4912486b3602d66a96325e133f560be502c0
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, with several pointing to domains associated with link farms and disposable hosting, indicating a malicious intent to redirect users. The ML classifier and ClamAV detection strongly suggest malicious content. While no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a phishing or malicious redirection scheme.

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/wix?keyword=sweet+evil+pdf+espa%25C3%25B1ol PDF link annotation
    • http://rolapisi.scienceontheweb.net/la_guerra_de_las_100_horas_entre_honduras_y_el_salvador.pdfIn PDF document text
    • http://rozujed.sportsontheweb.net/harbor_freight_scroll_saw_vs_wen_scroll_saw.pdfIn PDF document text
    • http://fizovovapoz.iblogger.org/2007_jeep_grand_cherokee_limited_wheel_size.pdfIn PDF document text
    • http://nafarami.medianewsonline.com/who_supported_johnsons_reconstruction_plan.pdfIn PDF document text
    • https://kawuwulaf.weebly.com/uploads/1/3/3/9/133987507/cd1a36dff.pdfIn PDF document text
    • http://zizodoroluxonaf.sportsontheweb.net/fujitidimidubodin.pdfIn PDF document text
    • http://steblin.pro/integumentary_system_quiz_and_answersxp1k5.pdfIn PDF document text
    • http://roxelejabojafe.scienceontheweb.net/remutojalumexamenib.pdfIn PDF document text
    • https://kagapefox.weebly.com/uploads/1/3/4/8/134846757/9a6631928a1ee7d.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/juzewojavomofew/google_adwords_certification_study_guide_2018.pdfIn PDF document text
    • http://lelixik.epizy.com/gotobenugijeli.pdfIn PDF document text
    • https://s3.amazonaws.com/doxifuba/keurig_cup_size_guide.pdfIn PDF document text
    • http://jeborawaleko.atwebpages.com/43258312702.pdfIn PDF document text
    • http://jutejuviwolopis.rf.gd/angry_birds_pc_free.pdfIn PDF document text
    • http://supegawezokex.epizy.com/47075979663.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_off0000e5ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5ED 5404 bytes
SHA-256: 3fbd449fcae6d792a48f8e1295cb94750fe933b2aff74e6efacde5310491da77
font_01_sfnt_off0000f83a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF83A 10140 bytes
SHA-256: 5e857478b94a9d692e37c92b706c9dba5b22a9192b8ca63ddc3ef8c59842d9b8

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