Malicious PDF — malware analysis report

Static analysis result for SHA-256 c19591c016e6c473…

MALICIOUS

PDF

72.1 KB Created: 2021-03-23 19:54:13 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 408ac36e19758fd5b283aa3c2c8cd07e SHA-1: b7ccf2ad0ebbbcce1600b8ceaaa83eb133d041ed SHA-256: c19591c016e6c473017ec0750a206441153b7f14410541882e8e0fbdccaa6fea
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, a technique often used for SEO spam or to redirect users to malicious sites. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and numerous external links suggest it's designed to lead users to potentially harmful content or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://zajinet.ru/strik?utm_term=celtx+word+count PDF link annotation
    • http://kurixuj.sportsontheweb.net/53502232540.pdfIn PDF document text
    • https://cdn.sqhk.co/rokijatu/zjgjcjj/axios_post_headers_form_data.pdfIn PDF document text
    • http://wirufebo.22web.org/bombay_stock_exchange_download.pdfIn PDF document text
    • https://cdn.sqhk.co/sawusuzi/ZPgjMhf/xopezufojatitize.pdfIn PDF document text
    • https://zarimuxeve.weebly.com/uploads/1/3/4/8/134897304/7f42ff.pdfIn PDF document text
    • https://cdn.sqhk.co/niririga/fhbsrqu/vip_car_accessories_services.pdfIn PDF document text
    • https://pugulewex.weebly.com/uploads/1/3/1/4/131406013/53a74.pdfIn PDF document text
    • https://cdn.sqhk.co/pujixefan/gdeOO9O/bixedaparisegowomixusex.pdfIn PDF document text
    • http://hookup158.fun/loweknhaka.pdfIn PDF document text
    • http://kinorio5.xyz/hp_probook_6540b_reviewmx79h.pdfIn PDF document text
    • https://cdn.sqhk.co/zifalulog/ajcghVh/snes_controller_nintendo_switch_canada.pdfIn PDF document text
    • https://xulakuvoloja.weebly.com/uploads/1/3/0/8/130813987/eef57560e33d.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://duvodix.myartsonline.com/britax_car_seat_shoulder_strap_adjustment.pdfIn PDF document text
    • http://duwufinojitu.rf.gd/dragon_city_guide_elements_critical.pdfIn PDF document text
    • http://jodafibo.epizy.com/43111137800.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000de0e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE0E 4608 bytes
SHA-256: 3e4800d2edc17a0075e1f4b4df0d65c7e099e326ac67dd22ecf5ed0faa9d501d
font_01_sfnt_off0000eddd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDDD 11132 bytes
SHA-256: 55d645683223d60551011134e25ed00eb19fb9bcd665f5c8b96d26bac5c07c79

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