Malicious PDF — malware analysis report

Static analysis result for SHA-256 b9b9cf6f18811365…

MALICIOUS

PDF

77.2 KB Created: 2021-03-23 12:57:49 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 3087fd8f209f4d3d38507c1adbd45227 SHA-1: 9748f8c9026435af985f46fc7473f0d2406e57dd SHA-256: b9b9cf6f18811365890bb78c604d0724f43911282d8a65a62272a26e225245e5
186 Risk Score

Malware Insights

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

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 0.9995

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://soxebez.ru/strik?utm_term=solution+definition+chemistry+class+9 PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4378161/normal_601c97f26ead8.pdfIn PDF document text
    • http://mizifasurogik.mywebcommunity.org/8832025234.pdfIn PDF document text
    • https://xekafifem.weebly.com/uploads/1/3/4/6/134669887/sodababi.pdfIn PDF document text
    • http://pozopamux.iblogger.org/functional_analysis_balmohan_limaye_free.pdfIn PDF document text
    • https://matamelo.weebly.com/uploads/1/3/1/3/131384575/5227255.pdfIn PDF document text
    • http://xezixaz.getenjoyment.net/remove_watermark_python.pdfIn PDF document text
    • https://mupipuko.weebly.com/uploads/1/3/4/3/134370635/958be0b0e62a76.pdfIn PDF document text
    • https://vorexumezekadan.weebly.com/uploads/1/3/0/9/130969740/pinavixufikam.pdfIn PDF document text
    • http://fulukegoror.getenjoyment.net/virowojuliker.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4492900/normal_604655c088375.pdfIn PDF document text
    • https://mirovufi.weebly.com/uploads/1/3/5/9/135958785/5199317.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://0aed7b51-d02b-4864-a6bb-b478bb809667.filesusr.com/ugd/fbdaab_7e4dffedb63e4d2abc4ad94b479db580.pdf?index=trueIn PDF document text
    • http://sozofini.epizy.com/zipevaxafagogog.pdfIn PDF document text
    • http://jimakobogugiwa.epizy.com/acog_gbs_guidelines_2018.pdfIn PDF document text
    • http://kibajopowal.epizy.com/loluwoz.pdfIn PDF document text
    • http://rusakarazixano.epizy.com/kodozuzexojokolewal.pdfIn PDF document text
    • http://ketaxesam.epizy.com/do_forex_trading_robots_really_work.pdfIn PDF document text
    • http://gubadix.epizy.com/garmin_g650_tutorial.pdfIn PDF document text
    • http://karuserewojax.epizy.com/aha_bls_provider_manual.pdfIn PDF document text
    • https://d86ad34a-7df2-4f47-937b-a12ab5abc0fa.filesusr.com/ugd/8cbfce_2c3bfc5ed67c420e873ec06f60761a84.pdf?index=trueIn PDF document text
    • https://24976a62-ea59-4ca6-8500-d0bd08f9a094.filesusr.com/ugd/65a075_629792b555d945258a4d660df8430f7f.pdf?index=trueIn PDF document text
    • http://dasiletu.epizy.com/counter_strike_condition_zero_online.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_off0000eca2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECA2 5620 bytes
SHA-256: f22ff9c2f7ccc36d7e65c32322d506f38f1cb13909dd646d42ec02bc588bca82
font_01_sfnt_off0000ff9b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF9B 11584 bytes
SHA-256: 373648fa40cbac90630ed43b4e87fc30f3c7bdeede6ed12b6f95a2dbd1ac11b2