Malicious PDF — malware analysis report

Static analysis result for SHA-256 893f63e86027bec7…

MALICIOUS

PDF

72.5 KB Created: 2021-03-08 17:37:22 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-04
MD5: c6132f761212219f6224b4dbaae134f7 SHA-1: c9baac0e916213dcacf1b340c2688713ece4adaf SHA-256: 893f63e86027bec7a0dde24d3475c12a53925dad45759466d5143cbd4ec742f9
186 Risk Score

Malware Insights

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

This PDF file contains a large number of external links, many hosted on disposable domains, characteristic of a link farm designed to redirect users to malicious content. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and URL patterns suggest it's part of a campaign to lure users to compromised or malicious websites.

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://baarspo.ru/award?keyword=bauder+pir+mf+pdf PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4424330/normal_5fed9d38d20f4.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4393036/normal_5ff28cadc6fcc.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379960/normal_6044cd59aa26a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4426945/normal_6021d47690766.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454682/normal_5fd3255bbea1d.pdfIn PDF document text
    • https://bejivuvepezera.weebly.com/uploads/1/3/4/4/134437422/9311653.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4422385/normal_601cf033f385f.pdfIn PDF document text
    • https://kajilavenusifo.weebly.com/uploads/1/3/2/6/132683330/xezaxuvufokag_zuzupanawakipe.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4489601/normal_60265d4e49d95.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4482418/normal_5fd1deae1dfe4.pdfIn PDF document text
    • http://joretuvivofip.22web.org/61355574486.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4406168/normal_5ff9af0d2720e.pdfIn PDF document text
    • http://fuvunopulo.22web.org/simple_past_tense_worksheets_for_grade_2.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/kokesatodixon/audio_converter_for_windows_8.pdfIn PDF document text
    • https://s3.amazonaws.com/kabisebax/91772200395.pdfIn PDF document text
    • http://gogitiboz.rf.gd/data_structures_and_algorithms_in_python_by_michael_t._goodrich_book.pdfIn PDF document text
    • http://terabamof.rf.gd/california_king_bed_sheets_nz.pdfIn PDF document text
    • http://tudemofexurujen.epizy.com/lock_screen_wallpaper_android_change.pdfIn PDF document text
    • http://sogilotewi.rf.gd/xutojetizetowatesem.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d25c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD25C 4612 bytes
SHA-256: e2aa34b69b92735c79dc40ef5ee99983133a3973aad50440aae55b1dcab030c0
font_01_sfnt_off0000e1fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1FC 10796 bytes
SHA-256: 447874c487516c90049ef5fdbb6fb8f3d3b99f16f4e317d3fa25210ef871eb05
font_02_sfnt_off000106ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106EE 4324 bytes
SHA-256: ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3

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