Malicious PDF — malware analysis report

Static analysis result for SHA-256 10b6350ff843178d…

MALICIOUS

PDF

74.4 KB Created: 2021-04-25 00:52:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 81d12f1ed3948caeda8dcc95436537bc SHA-1: 8e723ab499534528bac3e8b38786848873444ec7 SHA-256: 10b6350ff843178deec6892168f3631d288abad847878c2023a8e9fa6ddd726d
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

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=mental+math+worksheets+grade+2+pdf PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4372740/normal_5fd0471cd76e1.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4380857/normal_5fe3d6b263bec.pdfIn PDF document text
    • http://zowisofefo.iblogger.org/regupusurinajud.pdfIn PDF document text
    • http://zevibeponakat.getenjoyment.net/always_remember_us_this_way_guitar.pdfIn PDF document text
    • http://goxuladajozi.22web.org/jerapaxixukokuzunab.pdfIn PDF document text
    • http://tepexew.iblogger.org/admiralty_charts.pdfIn PDF document text
    • http://xuvaxujogilo.mygamesonline.org/what_are_the_characteristics_of_oceanic_crust.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4470389/normal_601dbbb32b364.pdfIn PDF document text
    • http://sikudej.22web.org/suwitebesidinexuvazuxufim.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4405409/normal_5fd1214620494.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4496389/normal_6029acb7072d5.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://sipariwemarisu.rf.gd/modelo_canvas_explicacion.pdfIn PDF document text
    • http://dawikoduwegoka.rf.gd/1160205894.pdfIn PDF document text
    • http://bogadamarixufa.epizy.com/como_realizar_una_composicion_escrita.pdfIn PDF document text
    • http://noroved.myartsonline.com/3516981562.pdfIn PDF document text
    • http://zitadufafasid.onlinewebshop.net/what_was_the_point_of_letter_from_birmingham_jail.pdfIn PDF document text
    • http://fejusudoboriduf.rf.gd/ecocardiograma_con_dobutamina.pdfIn PDF document text
    • http://demuwesax.epizy.com/viability_assessment_form.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_off0000e226.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE226 5748 bytes
SHA-256: 0f2cc2b7551e5556713e80a5e1c01e760bef3bd0df9616ac2c5c7a61fa6f5b7d
font_01_sfnt_off0000f5b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5B2 11320 bytes
SHA-256: 7e004ccbc10aafd7d94300bcd4e9ed13c09c4811e8557dcfd5216b8284b14cdc