Malicious PDF — malware analysis report

Static analysis result for SHA-256 86f7e00f039a90c2…

MALICIOUS

PDF

80.7 KB Created: 2021-02-25 22:50:58 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-16
MD5: e447f17bfa50ed2b433d56ecb992f702 SHA-1: a1a8e42e04aaa1b9b2880c110a5b098fde70cb23 SHA-256: 86f7e00f039a90c29832406feb10429a5cc598e5cb6893ee9ec901d0b3428529
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to disposable domains, indicating a link farm or phishing attempt. The ML classifier and ClamAV detection strongly suggest malicious intent, specifically identified as phishing. While no scripts were directly extracted, the PDF structure and URL patterns are consistent with techniques used to redirect users to malicious sites, likely for credential harvesting or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://druttle.ru/123?utm_term=what+are+the+4+basic+elements+of+communication PDF link annotation
    • http://kenugizi.getenjoyment.net/singapore_math_syllabus_kindergarten.pdfIn PDF document text
    • https://wujipiledulom.weebly.com/uploads/1/3/4/6/134695719/8643486.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4404964/normal_6033d95a57522.pdfIn PDF document text
    • https://cdn.sqhk.co/xidupesijij/fNOgfjd/94662312363.pdfIn PDF document text
    • https://futuratolofuzup.weebly.com/uploads/1/3/5/3/135399438/zekamo.pdfIn PDF document text
    • http://nobirejajatit.iblogger.org/47306439726.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4456398/normal_5ff899913ab06.pdfIn PDF document text
    • http://lizoguxumugef.mywebcommunity.org/83755583829.pdfIn PDF document text
    • http://dawexefif.getenjoyment.net/12335710139.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4403271/normal_5fc7e18e42b40.pdfIn PDF document text
    • https://cdn.sqhk.co/gizukakom/f2Hnghk/72959057194.pdfIn PDF document text
    • http://labifovejes.mypressonline.com/what_is_frederick_jackson_turner_known_for.pdfIn PDF document text
    • https://tojewenegekov.weebly.com/uploads/1/3/4/5/134502344/faxaxe-lekodosivo.pdfIn PDF document text
    • http://mevukavotidu.getenjoyment.net/what_does_the_acronym_best_stand_for.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/wafewopamenegiwajal.pdfIn PDF document text
    • http://tepoduzurajik.epizy.com/17634457912.pdfIn PDF document text
    • http://ginisanekuxowo.epizy.com/tell_me_about_yourself_in_interview_answers.pdfIn PDF document text
    • http://pomigipasa.epizy.com/fewepad.pdfIn PDF document text
    • http://liroporuki.myartsonline.com/69711330614.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_off0000fec9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEC9 5364 bytes
SHA-256: 6f4bdc12bfc8ed778439cec7978257e9e90b5baff7b7e0e145d2ec79e7aca85f
font_01_sfnt_off000110ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110EE 10752 bytes
SHA-256: 8209206247412a02407edba364da4a504de88647893a26842b4f4aa9f567a969

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