Malicious PDF — malware analysis report

Static analysis result for SHA-256 ec0afd8186ba1a5a…

MALICIOUS

PDF

87.6 KB Created: 2021-09-21 00:25:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 71a135f9a9b7bdd7bfa091e05dec100b SHA-1: 300911d44514230ecf0f493a7f5bcbf5ba078579 SHA-256: ec0afd8186ba1a5a76d8ead74af6a0e02a8d7d17665cbc826515a607dc9bebd0
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and multiple external URIs, with one heuristic specifically flagging it as a link farm on disposable hosting. ClamAV detection and ML classification strongly indicate malicious intent, likely for phishing or distributing further malware. The presence of embedded JS suggests an attempt to execute malicious code within the PDF viewer.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

Heuristics 6

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://mimpishio2bet.com/contents/files/43996238892.pdf In PDF document text
    • http://turatabor.hu/media/68896025278.pdfIn PDF document text
    • http://sun-green.de/ckfinder/userfiles/files/55968514041.pdfIn PDF document text
    • http://shanghaiqingchen.com/upload/files/72587175462.pdfIn PDF document text
    • http://relaxzenter.com/uploads/files/pataxagenemegipiregipiro.pdfIn PDF document text
    • http://ingfrimale.com/userfiles/files/rofalimojivesowopagabame.pdfIn PDF document text
    • http://boxethai38.com/upload/file/padixobasilogebigufogovi.pdfIn PDF document text
    • http://1-champagne.com/blog_images/blog_/file/90073763449.pdfIn PDF document text
    • https://aglogistics-bo.net/userfiles/file/jupuragedanerapigamavapax.pdfIn PDF document text
    • http://bydnjl.com/userfiles/files/89346570240.pdfIn PDF document text
    • http://taxicityplus.ru/userfiles/file/nosovi.pdfIn PDF document text
    • http://www.sbawerribee.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1614722fceedea---kojitigobar.pdfIn PDF document text
    • http://thegrcinstitute.org/app/webroot/js/ckfinder/userfiles/files/26676445975.pdfIn PDF document text
    • http://volkshilfe-ktn.at/images/content/files/57592994292.pdfIn PDF document text
    • https://xpress2.eu/ckfinder/userfiles/files/bedidipinujur.pdfIn PDF document text
    • http://branonperformance.com/ckfinder/userfiles/files/73341859310.pdfIn PDF document text
    • http://eggtesting.com/admin/uploads/file/jujixidawoduruvolabateku.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136122d4c903---babeladagaboturidivura.pdfIn PDF document text
    • http://prompol.com/media/file/gunivozetujuziw.pdfIn PDF document text
    • http://dichvumucin.com/upload/ckupload/files/75857624502.pdfIn PDF document text
    • http://ayurvedicclinic.org/userfiles/file/gikogomulakegezixujutorej.pdfIn PDF document text
    • http://nickelsgrafikdesign.de/ckfinder/userfiles/files/29656872691.pdfIn PDF document text
    • https://die-elke.de/cms/elke_page_files/file/7473074472.pdfIn PDF document text
    • http://fanti-fitness.pl/uploads/assets/file/mibijojelevudeku.pdfIn PDF document text
    • http://quiltingacademy.net/fckeditor/userfiles/file/14150231317.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=kingdom+hearts+3+download+androidPDF link annotation
    • 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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f333.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF333 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010b4a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B4A 10944 bytes
SHA-256: 1b94b1c03381ea5dba72dd7f323962e5f572d24518863970b631415a9543bdfe
font_02_sfnt_off00012452.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12452 17008 bytes
SHA-256: 8846d620f659e2ae95de540e2776bd39bc3407b9802a2e90c8fd32c0d59d7a2e