Malicious PDF — malware analysis report

Static analysis result for SHA-256 8b6aafdd6356ad27…

MALICIOUS

PDF

79.2 KB Created: 2021-09-13 23:43:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 5a5257a456c4b1d6f79af15e497915ab SHA-1: de5778c69cf26e69029d3e2c8754669ac227b57a SHA-256: 8b6aafdd6356ad2788e2af432fa1302524c474bfd67ca37520ad306843453021
142 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains embedded JavaScript and multiple external URIs, indicating it is designed to lead the user to malicious content or downloads. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware delivery. The presence of a visual download button further supports a lure-based attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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=border+buddy+app+android
    • https://intersat.lv/files/file/23753917895.pdf
    • http://aranysolyomfeszke.hu/editor_up/vozif.pdf
    • https://iqmuseum.mn/uploads/files/93809945674.pdf
    • http://furnitura-syndicat.ru/ckeditor/ckfinder/core/connector/php/uploads/files/zakadogufotunodajub.pdf
    • http://dulichtantai.com/files/uploaded/files/57382528493.pdf
    • http://kemnhapkhau.com/upload/files/poloxid.pdf
    • http://factory-01.com/js/upload/files/26526578095.pdf
    • http://labotinnghia.com/img/files/408836073.pdf
    • http://lnianemarzenie.pl/userfiles/file/wanodesagufinet.pdf
    • http://dalnoboy.net/data/filestorage/upload/files/21851494085.pdf
    • http://ipai-bg.eu/img/file/81121595959.pdf
    • http://www.cuadernos.in/wp-content/plugins/formcraft/file-upload/server/content/files/161332917894f9---kujerafiwafenebe.pdf
    • http://simonkuehner.de/gfx/userfiles/files/94822160163.pdf
    • http://jadever.vn/Images_upload/files/tekavovumorilisafelidel.pdf
    • http://dishandspoonproductions.com/ckfinder/userfiles/files/645182730.pdf
    • http://www.bluewhaleline.com/image/upload/File/tasakimitod.pdf
    • https://bakwanudang.com/contents/files/44941048578.pdf
    • http://imbirimbir.ru/files/wunifoliwajosugode.pdf
    • https://nolimitscenter.be/peausitive/images/FCKeditor/file/rijadur.pdf
    • http://jtylek.pl/Upload/file/71344439859.pdf
    • http://parmalab.it/userfiles/files/gewamanolumanixoba.pdf
    • https://ngonluathan.vn/images/ckeditor/files/82630020599.pdf
    • http://cl-metalparts.com/d/files/bamemukavidodazimesare.pdf
    • http://iwilldoit.ru/uploads/files/files/bujapukomuzijolujupafides.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_off0000d0bb.bin
71ca5c1e0e0ec9cb598426c6e9d73b5ca7ad6ade5cd4fc1cfc0e6c5c91d51e62		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD0BB 10480 bytes
font_01_sfnt_off0000e86c.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE86C 16792 bytes
font_02_sfnt_off0001007e.bin
a0e91f1037c199ef532aa3ef864f9184b6b5a21e42348ec7ee896734a410c2c6		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1007E 17616 bytes

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