Malicious PDF — malware analysis report

Static analysis result for SHA-256 9ae83a8bc3a87ddf…

MALICIOUS

PDF

78.4 KB Created: 2021-09-14 14:14:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 6a32be7a0849c88cafcbbee94ce79796 SHA-1: 5275bdf1981de6139326c5f47083f2902d7438b5 SHA-256: 9ae83a8bc3a87ddfc65c44d19ce65063ff16bf01b83558ee438708ad81912d2e
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF containing embedded JavaScript, flagged by ML classifiers and ClamAV as malicious. It functions as a link farm, hosting numerous links to other PDF files, likely to obscure the ultimate malicious destination or to distribute malware. The presence of embedded JavaScript suggests an attempt to execute malicious code within the PDF viewer.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

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://irlanc.ru/uplcv?utm_term=turn+off+work+profile+android
    • https://hophamthaibinh.com/upload/files/6167682361.pdf
    • https://mimpisiluman.com/contents/files/lekakupenanises.pdf
    • http://www.norestim.ro/wp-content/plugins/formcraft/file-upload/server/content/files/161345106138aa---mebanafibasewurefalex.pdf
    • https://millinerandassoc.com/files/file/pevuvu.pdf
    • http://museodegliarazzimarsala.com/userfiles/files/remut.pdf
    • http://autostyle-japan.com/js/upload/files/78589792726.pdf
    • https://rusepress.com/uploads/wysiwyg/files/duvigosikizudunu.pdf
    • http://polkovnik.su/upload/file/refikizuniluze.pdf
    • http://alfadent-volg.ru/images_uploads/files/5399767098.pdf
    • http://fazendasaojudastadeu.net/fotosempresa/files/nowavavejelat.pdf
    • http://grupposcorcia.it/userfiles/files/8747147561.pdf
    • http://thessalonikiflights.com/files/files/78886574994.pdf
    • http://stitesattorney.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/xulasu.pdf
    • http://robertoantoniz.com/resources/original/file/fejofakivebunidad.pdf
    • https://www.food-equipment-store.com/fckeditor/uploads/file/vimadowo.pdf
    • http://nfc.soo.jp/file/63305513808.pdf
    • https://hoongnau.com/upload/files/zetufakepokesugiki.pdf
    • http://zechnerbau.at/images/content/files/94255628908.pdf
    • http://eurekaelearning.com/upload/news/file/lavewuwumuvosuxozakugu.pdf
    • https://perfecthospital.org/FCKeditor/file/bemosafofabivi.pdf
    • https://caror.hu/ckfinder/userfiles/files/keporukemitepejadum.pdf
    • http://restavratorstvo.com/ckfinder/userfiles/files/guxabavoxavawuwusijomexi.pdf
    • http://dlshixiang.com.cn/ckfinder/userfiles/files/gavimumeparazikabukabo.pdf
    • http://agilesolutions.in/uploads/xawidujopiweta.pdf
    • https://campermagazine.tv/public/file/47254328216.pdf
    • http://gonvvama.net/filespath/files/20210908225729.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ce9f.bin
98fdcb3ade4993f76f4d48e9dccde0b013427d64eeb2674ef2f4fd17634c51e5		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCE9F 17440 bytes
font_01_sfnt_off0000fc2a.bin
8d1be2ba5088ec965980f20cb01787efbbcb66d5dfc6cde158b038642aed3aec		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFC2A 10468 bytes
font_02_sfnt_off0001140d.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1140D 16792 bytes

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