Malicious PDF — malware analysis report

Static analysis result for SHA-256 bdbec171d8baf88f…

MALICIOUS

PDF

72.7 KB Created: 2021-02-12 03:52:34 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 99231db508d68c4d42e7133c09635a59 SHA-1: 9098d54d00b8c1a3427bee8cb4dd02320dc6e0bc SHA-256: bdbec171d8baf88f42d609d374f6acc5f18499988d4a0b229c17477058731575
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to disposable hosting services and appear to be part of a link farm. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' confirms the nature of the URLs, suggesting an attempt to drive traffic to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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/wb?keyword=app%20agenda%20delen%20iphone%20android PDF link annotation
    • https://judozolu.weebly.com/uploads/1/3/1/4/131407514/jetopopejemumad_wibuxomu_gidirun.pdfIn PDF document text
    • http://fotonagosuslugi-01.space/pingu_knitting_patterns_freegid9b.pdfIn PDF document text
    • https://leviwajij.weebly.com/uploads/1/3/1/6/131637177/lekedujobavale.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4376357/normal_5ffb3d7cd6a5c.pdfIn PDF document text
    • http://pajugurujuvavux.22web.org/aggiornamento_android_pie_honor_view_10_lite.pdfIn PDF document text
    • http://datifuxevewa.22web.org/atlas_of_foraminifera.pdfIn PDF document text
    • http://habercigo.com/iso_14001_internal_audit_checklist0hbiv.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4496153/normal_5ff1c1e00cf0e.pdfIn PDF document text
    • https://josuriwomevopi.weebly.com/uploads/1/3/4/7/134769094/8718902.pdfIn PDF document text
    • http://jekigun.22web.org/mathematician_names_and_information.pdfIn PDF document text
    • http://podjem2.club/sentence_fragment_worksheet_with_answers0h6tt.pdfIn PDF document text
    • http://pomurofame.iblogger.org/98734257525.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://sufofivisis.epizy.com/69684577092.pdfIn PDF document text
    • http://memaded.epizy.com/adding_and_subtracting_integers_quiz_worksheet.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_off0000dd65.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD65 5032 bytes
SHA-256: 67c86c2f99e75f7fb9773387562151e4d423c188085ba537de9b5da8a8387486
font_01_sfnt_off0000ee78.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE78 11724 bytes
SHA-256: f6f92f267e4e12ef6577a3bd0407463fe218019480e4c285cf835c7db2d0d849

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