Malicious PDF — malware analysis report

Static analysis result for SHA-256 8e32240de65879a3…

MALICIOUS

PDF

80.2 KB Created: 2021-05-28 20:58:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: 37a27783cb0824d31a22dd231bf9a22c SHA-1: 82bba626bcff5b5059cbeaa3d0e099e2eea81bb1 SHA-256: 8e32240de65879a3773527bd0e8852e2169d8e3f6422225450da0dc502d0d2c5
186 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. It contains a large number of external links, many pointing to disposable hosting services, suggesting a link farm or redirection scheme. The document body, though heavily obfuscated, contains metadata related to its creation by wkhtmltopdf, and the presence of numerous external URIs indicates an attempt to direct the user to potentially malicious content hosted elsewhere.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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://baarspo.ru/strik?utm_term=what+does+it+mean+to+dream+of+a+baby+girl PDF link annotation
    • https://kufofena.weebly.com/uploads/1/3/4/5/134504524/4459379.pdfIn PDF document text
    • https://gomosonu.weebly.com/uploads/1/3/2/7/132712120/nizunorisogorowupovu.pdfIn PDF document text
    • https://vebupixe.weebly.com/uploads/1/3/4/8/134854050/4058774.pdfIn PDF document text
    • https://nizawubanivud.weebly.com/uploads/1/3/4/5/134529200/7578813.pdfIn PDF document text
    • https://vevuduwas.weebly.com/uploads/1/3/0/7/130775740/f78e81f63618.pdfIn PDF document text
    • https://balemimuw.weebly.com/uploads/1/3/4/8/134882120/vomomadi-zojikubolebol.pdfIn PDF document text
    • https://zafaketikeduve.weebly.com/uploads/1/3/4/7/134704309/jerisexi-badopofatuw.pdfIn PDF document text
    • https://kojepogezoxuta.weebly.com/uploads/1/3/4/4/134487575/569848.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4365539/normal_5ff527a87e605.pdfIn PDF document text
    • https://kojageku.weebly.com/uploads/1/3/3/9/133997895/7305626.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4459636/normal_606607885022c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4493600/normal_60415b1f208ce.pdfIn PDF document text
    • https://rebusisi.weebly.com/uploads/1/3/4/0/134017700/8272307.pdfIn PDF document text
    • https://vuriluwaloseg.weebly.com/uploads/1/3/4/4/134492921/nobopazuxe.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417033/normal_603c878f26f65.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/03f26f3a-fa78-467a-a2fe-86c792ef7674/ratopu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c2eb4649-4639-4a34-91fb-bc9ca1faf216/un_puente_hacia_terabithia_descargar.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0e71f645-274e-49a1-b2bc-597cf25f7870/gurigelakadumixibevub.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9e9a498b-05c6-4e4e-819e-1dd706a17a2d/7330342085.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d1ba24f0-1281-4990-8256-6f5f70f0c547/tozetipolokusogokorumokik.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a51de2c6-6e8c-42a7-8425-b8f1ec30c69b/koladeg.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c3491cdf-8c8f-4bd4-8f59-169aa76cfb40/libro_fundamentos_de_marketing_14_edicion.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2eed96db-8f3b-40e2-b068-79fcd539e833/woborogixib.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_off0000fb7e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB7E 5576 bytes
SHA-256: 5e6b186179c72325ad59d5263a5a269091ccd45198583957755114430adc3eb5
font_01_sfnt_off00010e60.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E60 10780 bytes
SHA-256: 061fcf803c87e9edcdbb0e2228f49b58a826b699691f4f8a73df37ecb1011858