Malicious PDF — malware analysis report

Static analysis result for SHA-256 e6050359a8528df4…

MALICIOUS

PDF

73.6 KB Created: 2021-09-10 20:30:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 386702e71d452897e4660251f4a40d00 SHA-1: 30ea0fa493cc586885dc498fd96e01959b0a7e12 SHA-256: e6050359a8528df42f4e85763c5d4e762119b64c9194fbf58fd1c1bd25a23de7
126 Risk Score

Malware Insights

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

The PDF document was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to multiple disposable domains, with one primary suspicious URL identified. The presence of embedded URLs and the nature of the heuristics suggest an attempt to deliver a malicious payload or phish for credentials.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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 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://incoyun.com/calisma2/files/uploads/75624879778.pdf In PDF document text
    • http://csc-vietnam.vn/uploads/userfiles/file/99249611428.pdfIn PDF document text
    • http://acudrved.com/ckfinder/userfiles/files/7691889777.pdfIn PDF document text
    • http://arc-en-cielproduce.com/ckfinder/userfiles/files/safikelekulelejaruzuxene.pdfIn PDF document text
    • http://greensquares.in/userfiles/file///pixesoz.pdfIn PDF document text
    • https://www.taxiserviceh24.com/wp-content/plugins/formcraft/file-upload/server/content/files/161318c45b3ea2---67686190041.pdfIn PDF document text
    • https://biorenta.lt/ckfinder/userfiles/files/fupifulidiririzopi.pdfIn PDF document text
    • https://big-affaires.com/img/pics/files/72893890278.pdfIn PDF document text
    • http://emons-verlag.net/testarea/cwsCMSlight/media/files/zuzudezofixate.pdfIn PDF document text
    • https://www.info-service.com.tw/plugin/ckeditor/ckfinder/userfiles/files/25563585021.pdfIn PDF document text
    • https://freshchannels.com/home/sites/freshchannels/public_html/ckfinder/userfiles/files/faruraxuzetena.pdfIn PDF document text
    • http://arcstema.com/userfiles/files/83436533573.pdfIn PDF document text
    • https://drddvichitra.com/userfiles/file/23898557937.pdfIn PDF document text
    • http://marketingnews.fr/images/file/memibibulenumit.pdfIn PDF document text
    • http://hytechplus.com/userfiles/file/38682119359.pdfIn PDF document text
    • http://henca.com/files/details/file/pamokupexasi.pdfIn PDF document text
    • http://fmi.lu/userfiles/files/67934038942.pdfIn PDF document text
    • http://moveworldtogether.com/datas/files/konaxigofek.pdfIn PDF document text
    • http://top-caster.com/userfiles/file/93454222846.pdfIn PDF document text
    • http://fueandhair.com/userfiles/files/wutep.pdfIn PDF document text
    • https://saftanton.dk/wp-content/plugins/formcraft/file-upload/server/content/files/16130841688b36---xiwugowefe.pdfIn PDF document text
    • https://mccartha-cobb.com/userfiles/files/48358139301.pdfIn PDF document text
    • http://around-sicily.net/userfiles/file/90557527942.pdfIn PDF document text
    • http://wangyiphk.com/userfiles/81051252209.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=tap+tap+tiktok+apkPDF 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_off0000bfc1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBFC1 16892 bytes
SHA-256: 5b0107c189b1d83817d198551c3c92fe2c592168e4a11be427cf11e183f4e9f3
font_01_sfnt_off0000eb53.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB53 9748 bytes
SHA-256: 5e084857bf4d90decf8d8b6a3d85a4343cb8c81944f268859d49e3572a590dfe
font_02_sfnt_off000100c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100C7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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