Malicious PDF — malware analysis report

Static analysis result for SHA-256 1e550ad979098961…

MALICIOUS

PDF

77.0 KB Created: 2021-04-28 11:23:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: 15f75f46232c8d3b4ba4fc66bb6fdf65 SHA-1: 5bea9ff73b5639b2e0f4af0864c9bb351d031866 SHA-256: 1e550ad979098961fc028bf3726291352cb18198896f04a9b90fb7d991cbd96c
194 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. It contains a large number of external links, many pointing to disposable hosting, suggesting a link farm designed to distribute malware. The primary malicious URL identified is https://vilenefex.ru/strik?utm_term=public+international+law+books+pdf. While no scripts were explicitly extracted, the PDF structure and link farm behavior indicate it's likely used to deliver a second-stage payload, potentially exploiting a PDF vulnerability.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://vilenefex.ru/strik?utm_term=public+international+law+books+pdf PDF link annotation
    • https://judexesadizit.weebly.com/uploads/1/3/0/7/130738912/sosuzo-nuvelezadufoj-ramak.pdfIn PDF document text
    • https://pexasuwen.weebly.com/uploads/1/3/4/5/134593650/mawagu.pdfIn PDF document text
    • http://gisoboxizaza.mygamesonline.org/nezawozudaxumexa.pdfIn PDF document text
    • http://fajamad.mypressonline.com/tudetezulasukozedaz.pdfIn PDF document text
    • https://cdn.sqhk.co/kivipemo/gciihgY/luzelak.pdfIn PDF document text
    • https://linugotozoluj.weebly.com/uploads/1/3/4/6/134662393/lidikamuwukor_zuvekituxez_suzimux.pdfIn PDF document text
    • https://vizegibog.weebly.com/uploads/1/3/4/4/134458583/solifa.pdfIn PDF document text
    • https://keduwiwisa.weebly.com/uploads/1/3/4/4/134486116/warotiw.pdfIn PDF document text
    • https://cdn.sqhk.co/zanuvajebodu/igAibak/paypal_customer_service_number_live_person.pdfIn PDF document text
    • https://fugejifok.weebly.com/uploads/1/3/4/1/134132056/b3f082f9cfe2255.pdfIn PDF document text
    • https://vugogirofezufus.weebly.com/uploads/1/3/4/3/134355312/3022599.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/sewamos/89542709914.pdfIn PDF document text
    • https://6c49ff76-e13b-46da-8354-2e633d56f736.filesusr.com/ugd/211c2d_dd83f48d931e42eab66a2425d8f71278.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/wupuxus/4158000211.pdfIn PDF document text
    • http://sipanokule.onlinewebshop.net/mantis_tillers_for_sale_near_me.pdfIn PDF document text
    • http://laxolagodofomug.onlinewebshop.net/paduturevexofow.pdfIn PDF document text
    • http://dawejur.atwebpages.com/calicut_university_bsc_computer_science_syllabus_2020.pdfIn PDF document text
    • https://e82ff0bd-cb1a-4782-8b92-0a0fb7657660.filesusr.com/ugd/d17951_10936fdd1fc94f6d83225a91e69b2f44.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/xamibudasagas/chunky_platform_sandals_cheap.pdfIn PDF document text
    • https://s3.amazonaws.com/loxopudizus/39025358380.pdfIn PDF document text
    • https://e510c2d5-567e-4a96-89ff-abc18316baf7.filesusr.com/ugd/8a9bcc_d1ada8298b7040f1875fb4ace629abfd.pdf?index=trueIn PDF document text
    • https://a146b927-ed54-472d-b3a8-6b137e313b92.filesusr.com/ugd/4d400c_eb3e819a871e499ea73f965d1eba1922.pdf?index=trueIn 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_off0000ede0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDE0 5444 bytes
SHA-256: 91f6491907fc9e1d37139ffd4f0fb7aed7aec40b2a7ab927581be67fe2189038
font_01_sfnt_off00010083.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10083 10568 bytes
SHA-256: d156186e3f13a37694543e1d845ed2cb9302335f7c3a28e5e177fd816c0ed84f

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