Malicious PDF — malware analysis report

Static analysis result for SHA-256 8f3d6d517976c09a…

MALICIOUS

PDF

81.2 KB Created: 2021-09-20 03:33:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: b2b81a4cb553b22388f73353ed6cf00c SHA-1: 9a1b70bbb37a81fb2d308c3b3f45564e418f7482 SHA-256: 8f3d6d517976c09a1249b0004b61caef9f4cfe25027c1a41e4e7d31bf532cc73
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is a common technique for delivering malicious content. This script likely redirects the user to a link farm, as indicated by the PDF_SEO_DISPOSABLE_LINK_FARM heuristic and the numerous unknown URLs. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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 https://mmrh.myagenda.cz/pictures/editor/files/11535829346.pdf
    • https://natinsel.com/imagenes/file/4615895697.pdf
    • http://zhjpharm.com/upload/files/vujorefivujemugepu.pdf
    • https://chp-travel.ir/data/file/danel.pdf
    • https://inchirieriavioane.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16147b058e8d5f---litegoteto.pdf
    • https://satesayap.com/contents/files/83997804803.pdf
    • https://middletonchambers.com/ckfinder/userfiles/files/76325354944.pdf
    • http://interfacetravels.com/app/webroot/js/ckfinder/userfiles/files/47501842614.pdf
    • http://fresh-j.info/images/uploadedimages/file/15660453157.pdf
    • http://limuzine.md/userfiles/file/zerasemud.pdf
    • https://zibarajabi.com/cache/fck_files/file/xexidu.pdf
    • https://phuketwebstudio.com/ckfinder/userfiles/files/26629094814.pdf
    • https://willes-gb.com/uploads/files/202109062051373946.pdf
    • https://schmitz.cz/res/file/34791262172.pdf
    • https://jaurrieta.net/USERFILES_JAURRIETA/files/lutisug.pdf
    • https://pikhospital.com/ck_uploads/uploads/files/27162223149.pdf
    • https://melz-feu.ru/upload/94437839236.pdf
    • http://kondicionery-elektrostal.ru/upload_picture/file/46099882902.pdf
    • https://jamuiboe.com/webroot/upload_media/76322231166.pdf
    • https://www.3dreamchurch.com/wp-content/plugins/super-forms/uploads/php/files/4d3b60bd2acc397e32cbaa11ef1a21aa/25706728515.pdf
    • http://bbu.vn/Images_upload/files/30563468800.pdf
    • http://sabancilojistik.com/userfiles/file/66868487379.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=latest+edition+of+apa+style
    • 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_off0000da01.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDA01 16792 bytes
font_01_sfnt_off0000f218.bin
1cce7b86b44b34cbaba4d2b895b182a019cc91be9a235e41391f2c96112b5d55		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF218 10460 bytes
font_02_sfnt_off000109f8.bin
b6661eb943e1cd42a0ce97ff4e68d2d9dcd92a87ab1f2fcaa73ad3c0c6eb99a1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x109F8 17488 bytes

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