Malicious PDF — malware analysis report

Static analysis result for SHA-256 48d4f2dca799b9cf…

MALICIOUS

PDF

81.5 KB Created: 2021-09-10 04:26:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-27
MD5: 3d799aef9be89045d1eb077176d423d4 SHA-1: f46b7c654e9acb001a0c7833600260760dab6615 SHA-256: 48d4f2dca799b9cf7287fe37c2768237430af7bf82e49ce19c9db0c9037fc3e5
134 Risk Score

Malware Insights

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

The PDF contains embedded JavaScript and is flagged by ML classifiers and ClamAV as malicious. It also functions as a link farm, directing users to multiple external PDF files hosted on various domains, indicating a likely phishing or malware distribution scheme. The presence of embedded JavaScript suggests an attempt to exploit PDF vulnerabilities or deliver malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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 http://186086.com/upload/files/wozuwuxoradabevidenate.pdf In PDF document text
    • http://szkolaprzybranowo.pl/ckfinder/userfiles/files/17415602012.pdfIn PDF document text
    • http://tlxzkj.com/uploads/file/100119344003.pdfIn PDF document text
    • http://theheavent.com/userfiles/files/15616079857.pdfIn PDF document text
    • http://www.thunderesp.com/ckfinder/ckfinder.htmlfiles/zipemagikijitazo.pdfIn PDF document text
    • https://vleek.com/uploads/files/3863069165.pdfIn PDF document text
    • http://hstairan.com/FCKeditor/editor/filemanager/connectors/php/userfiles/file/23204741275.pdfIn PDF document text
    • http://lovelyspa.net/ckfinder/userfiles/files/kudanaludumetegulamu.pdfIn PDF document text
    • http://sprinter-lab.ru/content/File/lazenesajimusonal.pdfIn PDF document text
    • https://navliecky.net/userfiles/file/fefipek.pdfIn PDF document text
    • http://lakesnwoodskerala.com/uploads/file/70274279463.pdfIn PDF document text
    • http://mobiliteit.nu/files/81807157680.pdfIn PDF document text
    • https://i-chat.tw/js/ckfinder/userfiles/files/fagukekukula.pdfIn PDF document text
    • http://fine-trading-knotwork.de/uploads/media/40125933533.pdfIn PDF document text
    • http://baggiez.net/userfiles/file/judidizebuxirewovutimi.pdfIn PDF document text
    • https://steammining.com/userfiles/file/52520489403.pdfIn PDF document text
    • http://worldofpacifiers.com/editor_uploads/system/files/7842990146.pdfIn PDF document text
    • https://www.fangjin.org/ckfinder/userfiles/files/fexofotowulidaweratag.pdfIn PDF document text
    • http://reopen911.info/media/file/dimovatogakexo.pdfIn PDF document text
    • http://handinks.com/ckfinder/images_store/files/polisotadodirujubujus.pdfIn PDF document text
    • http://www.astmalek.cz/obrazky/file/31329184323.pdfIn PDF document text
    • http://ipceurope.com/assets/file/76781266604.pdfIn PDF document text
    • https://gancza-yacht.pl/userfiles/file/9986435301.pdfIn PDF document text
    • http://ipllaser.in/uploads/84204782842.pdfIn PDF document text
    • https://lederstuehle-shop.de/ckfinder/userfiles/files/kezewuje.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=android+programming+language+tutorial+pdfPDF 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_off0000d938.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD938 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f14f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF14F 10752 bytes
SHA-256: db0f4b041d5e8f2a23833ab58a4b00cf2f1a8a4885256499fa4201da8931d75d
font_02_sfnt_off000109c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109C9 17880 bytes
SHA-256: 1e123ec13ac4184d5ab0ed21a3cca2d4110c8df86bfa968ebbb3947bb79e5d83