Malicious PDF — malware analysis report

Static analysis result for SHA-256 0b792ee81aefc3cc…

MALICIOUS

PDF

90.0 KB Created: 2021-03-29 10:45:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 9a7f861e0b0cb8dec97167c6815a5495 SHA-1: 75cf6ec17f86223ebd5a50d57965714af076a1ad SHA-256: 0b792ee81aefc3ccb5f286eca403f87173ba6d28a3a2869e8e9a49e58d23791b
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many pointing to disposable domains, suggesting a link farm or SEO poisoning tactic. The primary URL, https://mezovuduw.ru/award?keyword=bridge+to+terabithia+book+pdf, is presented as a search result for a book, likely a lure to direct users to malicious content. ClamAV and ML heuristics confirm the malicious nature of the PDF, classifying it as phishing or a trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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 contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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://mezovuduw.ru/award?keyword=bridge+to+terabithia+book+pdf PDF link annotation
    • https://dogaralezuj.weebly.com/uploads/1/3/1/6/131637140/mixurenoredebuji.pdfIn PDF document text
    • http://confirmationhelpcenter.com/birthday_invitation_microsoft_word_templatexkne4.pdfIn PDF document text
    • https://cdn.sqhk.co/rijakobebux/hbgioMB/8586672444.pdfIn PDF document text
    • https://cdn.sqhk.co/takulowizi/hibiehi/whatsapp_status_video_barbie.pdfIn PDF document text
    • https://cdn.sqhk.co/fimegasaz/gWWoAPb/77946980824.pdfIn PDF document text
    • https://cdn.sqhk.co/volixusej/J9ZDii6/tuberculosis_deaths_2019_america.pdfIn PDF document text
    • http://cartest.pro/19602760055t2v3f.pdfIn PDF document text
    • https://cdn.sqhk.co/kigudukolon/PifjaOW/confrontational_naming_worksheet.pdfIn PDF document text
    • http://zixivudu.getenjoyment.net/76408321712.pdfIn PDF document text
    • http://penageli.getenjoyment.net/does_p90_build_muscle.pdfIn PDF document text
    • https://samabuwe.weebly.com/uploads/1/3/0/7/130739499/lopomotoborawedepezo.pdfIn PDF document text
    • https://cdn.sqhk.co/sururezog/eJ8Aygi/noun_phrase_in_sentences_worksheets.pdfIn PDF document text
    • https://cdn.sqhk.co/soxaxojuxa/jsiiaic/58550374999.pdfIn PDF document text
    • http://idealica-italy.site/overflow_line_break_jspdfb3utf.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/toguvaju/mack_e7_460_specs.pdfIn PDF document text
    • https://s3.amazonaws.com/lofese/webuzozimuvitiwolejojefix.pdfIn PDF document text
    • https://s3.amazonaws.com/petubapizo/shared_web_hosting_vs_wordpress_hosting.pdfIn PDF document text
    • https://s3.amazonaws.com/nimuwet/descargar_bubble_bobble_taito_para_android_gratis.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_off00012123.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12123 5344 bytes
SHA-256: 7311842af034043fd4d6140b9c310e730ba323d9efa7671875ab77e74d83d3a1
font_01_sfnt_off00013347.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13347 11104 bytes
SHA-256: 0e167c3fb56a8feae0238ae2aec565fe3e4c33b4b80c3f4777bce96188a16f4b

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