Malicious PDF — malware analysis report

Static analysis result for SHA-256 9055931e57d5965b…

MALICIOUS

PDF

77.4 KB Created: 2021-04-30 21:59:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: 5f1da44d18f406e672043da34ebdbecf SHA-1: f045a8eb8b7cbc11cd77e59ebcd243ff1402b17f SHA-256: 9055931e57d5965bbb5308d80182bd8bea653eb36a30a99f849d5d6a940624bb
126 Risk Score

Malware Insights

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

The sample is identified as malicious by ClamAV and an ML classifier, with heuristics indicating it functions as a link farm on disposable hosting. The embedded URLs, particularly 'https://mezovuduw.ru/strik?utm_term=ars+notoria+pdf+espa%25C3%25B1ol+gratis', suggest a phishing or malware distribution lure. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with malicious documents designed to redirect users to harmful 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://mezovuduw.ru/strik?utm_term=ars+notoria+pdf+espa%25C3%25B1ol+gratis PDF link annotation
    • http://twirlini.com/kebizotapupijq2v0e.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4390681/normal_5fe292e79c6b7.pdfIn PDF document text
    • http://trastqort.online/video_cutter_and_joiner_apkkj1zl.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4489839/normal_5fd974cc4d39e.pdfIn PDF document text
    • https://kedadatiwuji.weebly.com/uploads/1/3/4/8/134891749/mekabox.pdfIn PDF document text
    • http://mmamba.ru/63499338788sbsoy.pdfIn PDF document text
    • http://grafoanaliz.ru/wadufaludemovepote9log6.pdfIn PDF document text
    • http://aslixan.com/google_sketchup_8_house_models_download02kmg.pdfIn PDF document text
    • https://gavozosalaz.weebly.com/uploads/1/3/1/1/131163920/sakewurebon.pdfIn PDF document text
    • http://carinsusa.info/spectrum_math_workbook_grade_8_free92cvz.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4381344/normal_6065ed664eebd.pdfIn PDF document text
    • http://lnstagramverifiedsbadgeforms.com/67214868809gyxpp.pdfIn PDF document text
    • http://love-cosmetics.shop/english_to_spanish_audio_translation_app_for_androido4k54.pdfIn PDF document text
    • https://welogedaxo.weebly.com/uploads/1/3/3/9/133997457/38424b903e.pdfIn PDF document text
    • https://walazufa.weebly.com/uploads/1/3/1/3/131383665/wutalizek-tuxep-xukaf-jufenota.pdfIn PDF document text
    • http://mishgen.com/23081312439ynrg9.pdfIn PDF document text
    • http://erogan-oficial.site/xfinity_x1_box_will_not_turn_onafm4x.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/8dd16d99-7158-4894-8569-1415a14c1989/saripisulifimifejer.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c8e3cb7a-a397-462e-a8e7-e2270009670e/37863807609.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_off0000ebcd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBCD 5408 bytes
SHA-256: b452ca91a8268cf38c50986e7fdd9ba0d408914109b4d828d98f49f892b7af43
font_01_sfnt_off0000fe06.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE06 12496 bytes
SHA-256: bc3a5e296b2226f3c6a71741f8aad75e5220b6544f4138e5b8208c06721af72f

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