Malicious PDF — malware analysis report

Static analysis result for SHA-256 e28da5d6bee25d01…

MALICIOUS

PDF

74.1 KB Created: 2021-01-31 04:39:59 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: 614cad7c762826440c76ef7f364f9e07 SHA-1: 816660f75a2cdd434ce427264c017a1aa8452cd1 SHA-256: e28da5d6bee25d01d2edf50b95adb1d4e72b7eb3907a241d82433897c2de7592
184 Risk Score

Malware Insights

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

The PDF contains embedded links that redirect to malicious infrastructure, as indicated by the PDF_MALICIOUS_REDIRECTOR_LINK heuristic and the ML_NYX_PDF_MALICIOUS classification. The document body is heavily obfuscated and appears to be a lure, likely attempting to trick users into clicking the malicious links. No scripts were extracted, but the presence of malicious redirector links strongly suggests a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://yafferge.ru/123?utm_term=what+are+the+elements+of+most+film+trailers In PDF document text
    • http://wupupetobuzune.22web.org/99627858573.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4453754/normal_5fee859015f74.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4371005/normal_5fd2d72e19302.pdfIn PDF document text
    • http://daating19.site/kigiretitawifeleuvjoc.pdfIn PDF document text
    • http://doxugivo.22web.org/android_tablet_9_inch_screen.pdfIn PDF document text
    • http://revershjtb.site/swapna_varahi_mantra_in_teluguxq8vl.pdfIn PDF document text
    • http://sevazumemozoli.22web.org/73257336601.pdfIn PDF document text
    • https://katalajoguv.weebly.com/uploads/1/3/2/7/132740778/1576674.pdfIn PDF document text
    • https://padudarudiloga.weebly.com/uploads/1/3/4/7/134714427/ba7e4537ea23a.pdfIn PDF document text
    • http://tersq.fun/80937410427ffeeu.pdfIn PDF document text
    • https://ruwawowek.weebly.com/uploads/1/3/2/7/132712040/lulugadamodefewe.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4451945/normal_6008c5a2b9fd0.pdfIn PDF document text
    • https://sebinegovana.weebly.com/uploads/1/3/4/0/134095930/pisupij.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4414515/normal_5fcc3a2fd2dab.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://pejonoma.epizy.com/39912183534.pdfIn PDF document text
    • http://zunuwovadete.epizy.com/business_google_sheet_templates.pdfIn PDF document text
    • http://zobawukesilebaf.epizy.com/81085794285.pdfIn PDF document text
    • http://lagadasisipas.rf.gd/9306887870.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_off0000e4ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4EF 5020 bytes
SHA-256: 150986d9a0293f866dd26138e5e181d4705e4dfbb7af22c749a3bc6cb8f98f3c
font_01_sfnt_off0000f5e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5E0 10984 bytes
SHA-256: ab55d7840e2e87265e57755b654471fc94517432118d0dad04ddf288c9973e24

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