Malicious PDF — malware analysis report

Static analysis result for SHA-256 08418de83dc5a01e…

MALICIOUS

PDF

75.5 KB Created: 2021-03-15 15:33:16 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: e719d10d2909cda87efe9bbd94f85e55 SHA-1: 11a8bac505ad24a345d1e0af9f404885e0e44317 SHA-256: 08418de83dc5a01e4c4ba58235d312381e18f8a49f3255af02fe395fb941806b
126 Risk Score

Malware Insights

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

The PDF file contains numerous external URIs, many hosted on disposable domains, suggesting a link farm or phishing lure. The ML classifier and ClamAV detection strongly indicate malicious intent, specifically identified as a phishing trojan. Although no scripts were explicitly extracted, the PDF structure and heuristic firings point towards the exploitation of PDF vulnerabilities or social engineering to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

Heuristics 5

  • 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 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://jacksth.ru/wix?keyword=anfractus+latin+definition PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4445532/normal_601e122d32444.pdfIn PDF document text
    • https://cdn.sqhk.co/bulunazi/jahuR5J/25233835715.pdfIn PDF document text
    • https://cdn.sqhk.co/givifevulo/guNl4kV/coins._ph_wallet_log_in.pdfIn PDF document text
    • https://mudulavodeg.weebly.com/uploads/1/3/1/0/131070753/699fd62bd.pdfIn PDF document text
    • https://gazipiserit.weebly.com/uploads/1/3/4/8/134883514/xotafegebuvidif.pdfIn PDF document text
    • https://cdn.sqhk.co/ximegawaso/hf8jfwm/91133474275.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4470980/normal_5fee68bb04998.pdfIn PDF document text
    • https://wirosumarot.weebly.com/uploads/1/3/1/3/131398493/6826511.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369499/normal_6023fd8180ccb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4376858/normal_5fe97bf3b58ee.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450509/normal_602a757007c20.pdfIn PDF document text
    • http://wemuwugisenoro.iblogger.org/mathematics_grade_12_caps_textbook.pdfIn PDF document text
    • https://cdn.sqhk.co/jisepozidis/fiijcfS/radio_flyer_movie_buffalo_scene.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4409246/normal_603376161eb11.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4466173/normal_5fe7cbc231ced.pdfIn PDF document text
    • https://xepapure.weebly.com/uploads/1/3/4/3/134367208/dbc4b51ccb32744.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4489593/normal_5feccf7755f24.pdfIn PDF document text
    • https://risibazizugati.weebly.com/uploads/1/3/4/7/134710005/2323782.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4483589/normal_5fcd24bf3e5f5.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://mawibapinanakos.epizy.com/blood_cancer_report_of_a_patient.pdfIn PDF document text
    • http://zojuroveji.epizy.com/physics_textbook_for_senior_secondary_school.pdfIn PDF document text
    • http://vevugep.epizy.com/98978633114.pdfIn PDF document text
    • http://dukudolit.rf.gd/40965430340.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_off0000e497.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE497 5004 bytes
SHA-256: 5da1c20918d685e5355081778e61c5dc360e931c1f0536b2d68a69a7f45895ce
font_01_sfnt_off0000f5a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5A7 13144 bytes
SHA-256: 09b63924864b773c83dd3774982ea54f4d881efa9994ce5c73513d1aadb5bc17

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