Malicious PDF — malware analysis report

Static analysis result for SHA-256 855fc749a162471c…

MALICIOUS

PDF

84.9 KB Created: 2021-10-05 07:09:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 6a43c6a4f9cb6a0d8fbb6251ca8a7151 SHA-1: ce690c51264867d951cfeac108fe61b0989e1f23 SHA-256: 855fc749a162471cc44d2739e536a33e6fedf43f5dd52e356085b8fe2e03abc6
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to disposable domains and are structured as file downloads. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The presence of embedded JavaScript suggests an attempt to exploit vulnerabilities or perform malicious actions within the PDF viewer.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 6

  • 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.
  • 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://synerhu.ru/uplcv?utm_term=pros+and+cons+of+petroleum PDF link annotation
    • http://topup-fight.com/ckfinder/userfiles/files/76830850614.pdfIn PDF document text
    • http://sarljarry.com/userfiles/file/37015564384.pdfIn PDF document text
    • https://tectrongim.com/uploads/file/18511384787.pdfIn PDF document text
    • https://fruitssupplier.com/app/webroot/img/files/49447027052.pdfIn PDF document text
    • http://chingyi.tw/userfiles/files/togajajexazuvopejotubax.pdfIn PDF document text
    • http://uniontsg96.ru/admin/ckfinder/userfiles/files/2863540284.pdfIn PDF document text
    • http://studiozoppini.com/userfiles/files/mufanisafajexonomenaxoxo.pdfIn PDF document text
    • https://tp-pos.com/uploads/image/files/83638485770.pdfIn PDF document text
    • https://aayams.com/userfiles/file/99682317234.pdfIn PDF document text
    • http://vucert.vn/uploads/files/85526726102.pdfIn PDF document text
    • http://cuacongtudongbinhduong.com/upload/files/ludimotumotezapilobuko.pdfIn PDF document text
    • https://e-midas.ro/files/file/gemofugoripezikuvifufivul.pdfIn PDF document text
    • https://simorgh.it/uploads/file/60423225926.pdfIn PDF document text
    • http://spodne-pradlo-2bpoint.sk/UserFiles/File/depawixob.pdfIn PDF document text
    • http://diversecityuk.com/userfiles/file/79455101645.pdfIn PDF document text
    • http://uptownchantilly.com/uploads/files/korapewomimebesiwozogo.pdfIn PDF document text
    • http://mtkshop.com/images/uploads/file/49731185938.pdfIn PDF document text
    • http://hnyinfeng.com/d/files/57898789318.pdfIn PDF document text
    • https://joyfool.art/wp-content/plugins/super-forms/uploads/php/files/2c16644dfcb5eb3190deed40b8bfe3ad/xomawevaxix.pdfIn PDF document text
    • http://lt101shop.com/userfiles/files/33819245336.pdfIn PDF document text
    • http://meyergarden.com/ckfinder/userfiles/files/feruw.pdfIn PDF document text
    • http://ruresept.ru/files/file/sonaxegitulu.pdfIn PDF document text
    • https://www.shamshabaddiocese.org/files/js/ckfinder/userfiles/files/463432166.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://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_off0000e5e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5E9 10788 bytes
SHA-256: f48c80db28326722007faf8abe081cd2209a80898eb549e6fb4d2792f77e53d4
font_01_sfnt_off0000fece.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFECE 18240 bytes
SHA-256: 0e3f3f8bc556a02ebddd5f7c028f4073164bcc5f19ebdaca5e64fbc916e272b2
font_02_sfnt_off00012dcf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12DCF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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