Malicious PDF — malware analysis report

Static analysis result for SHA-256 1be86019287615fe…

MALICIOUS

PDF

93.5 KB Created: 2021-02-26 10:59:19 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-07
MD5: 9c677e849fcb9e370d9100ae16ff7d72 SHA-1: 710feeea5dc077c7d3289ef70745a36c5f987c48 SHA-256: 1be86019287615fecc92cde144bed229c1487abb18ddc8d37bd6ceaa7ef0ffa2
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains a large number of external links, many pointing to Weebly-hosted PDFs, indicating a link farm for SEO manipulation. The ClamAV detection and ML classifier strongly suggest malicious intent, likely to redirect users to phishing sites or download further malware. No scripts were extracted, but the PDF structure itself facilitates the malicious redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 5

  • 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.
  • 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://xajibur.ru/award?keyword=tough+mudder+fitness+requirements PDF link annotation
    • https://buxudirikebipur.weebly.com/uploads/1/3/1/1/131164004/ddac9c251.pdfIn PDF document text
    • https://lofusomibebez.weebly.com/uploads/1/3/2/7/132740423/27eb9.pdfIn PDF document text
    • https://jedexapotup.weebly.com/uploads/1/3/4/4/134472831/e65f4d77c5cdd.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367919/normal_602366d57096c.pdfIn PDF document text
    • http://wumorumomu.22web.org/293943224.pdfIn PDF document text
    • https://jukonejidar.weebly.com/uploads/1/3/4/8/134876273/331232.pdfIn PDF document text
    • https://kaginugopaz.weebly.com/uploads/1/3/4/3/134310825/rimovuvubepo-wexovekovifuro-tuvedalon.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4403283/normal_5ff9c2b0d6346.pdfIn PDF document text
    • https://fezagexagowib.weebly.com/uploads/1/3/5/3/135313062/d08dd43a7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4407304/normal_603680aac7407.pdfIn PDF document text
    • https://rezemofojo.weebly.com/uploads/1/3/5/3/135321986/d89e67734.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://suvubojetixag.epizy.com/uiic_vehicle_insurance_app.pdfIn PDF document text
    • https://s3.amazonaws.com/dibedamoka/descargar_el_libro_amar_o_depender_en_gratis.pdfIn PDF document text
    • https://s3.amazonaws.com/savukojubusum/3gp_afshan_zebi_songs.pdfIn PDF document text
    • http://tukurazetuxud.epizy.com/livre_pour_apprendre_allemand.pdfIn PDF document text
    • https://s3.amazonaws.com/rokuwapesu/national_library_of_medicine_style_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/winumigutam/wabejeratodetegogi.pdfIn PDF document text
    • http://zikinevubebera.epizy.com/begefore.pdfIn PDF document text
    • https://s3.amazonaws.com/babetafaperaxov/61046857939.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010dfc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DFC 5036 bytes
SHA-256: a906be6371e9565d8fa7759a628df9719fffc0c01b9f935228fedcda2224c222
font_01_sfnt_off00011ef1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11EF1 10700 bytes
SHA-256: 59d3526150fc0f3b6d27af7576165b2c072b1d6a50bf5a18b8ae251dbc901270
font_02_sfnt_off000143bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x143BD 16660 bytes
SHA-256: 451a97a76e1cd188b335db18aa59b090969584b10ed985ec5dcca0b5cdb1d7ae
font_03_sfnt_off000159ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x159EE 4324 bytes
SHA-256: ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3

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