Malicious PDF — malware analysis report

Static analysis result for SHA-256 8187622d6d5a0431…

MALICIOUS

PDF

71.3 KB Created: 2021-10-01 09:55:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 68ca84df76dd857c99c9ee750aa92159 SHA-1: a3da7243881baf28d33d219c6dce246734ce6483 SHA-256: 8187622d6d5a0431b177437640346c3a2f5e6b2053ba01a8c69427725e016fe3
134 Risk Score

Malware Insights

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

The PDF contains embedded JavaScript and numerous external URIs, indicating it is designed to redirect users to potentially malicious websites. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. The presence of embedded JavaScript points to exploitation for client execution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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://drafthe.ru/uplcv?utm_term=online+chal+mera+putt+full+movie
    • https://mimpisiluman.com/contents/files/wikakukonusadinipinow.pdf
    • http://orderleesushi.com/uploads/files/90126874767.pdf
    • http://actionelectric.pt/www/wp-content/plugins/formcraft/file-upload/server/content/files/16134f0bf807a8---27914717097.pdf
    • http://mkconline.com/landmark/ckfinder/userfiles/files/40657932566.pdf
    • http://www.heatandgas.com/EditorImages/file/1288924434.pdf
    • https://pierrelemagicien.com/userfiles/file/58601588986.pdf
    • http://de.ruben.pl/ckfinder/userfiles/files/29613073410.pdf
    • https://nguyenthelong.net/userfiles/files/bedewosip.pdf
    • http://www.giuseppe.ru/ckfinder/userfiles/files/65809339034.pdf
    • http://mansiya.com/uploadfile/files/dabuvokenivugij.pdf
    • http://benly-carson.com/product/files/gonevo.pdf
    • https://hondamienbac.vn/userfiles/file/36706018060.pdf
    • http://www.sm.ac.th/ckfinder/userfiles/files/97310147862.pdf
    • http://pomodorolennep.de/gfx/userfiles/files/63985465370.pdf
    • http://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613f59b51b5d1---tikodure.pdf
    • http://cowmoo.org/ckfinder/userfiles/files/89583669931.pdf
    • http://keralatravelpath.com/uploads/file/31134205740.pdf
    • http://automotiveenergy.cz/userfiles/file/2015916599.pdf
    • https://gemma.lucien-sv.info/uploads/files/613551639f201.pdf
    • http://greenhere.cn/upload/ckimg/files/202110011050184325.pdf
    • http://mutamobilya.com/images_upload/files/68273986978.pdf
    • https://belretail.by/ckfinder/userfiles/files/wenaletagurok.pdf
    • http://longbienco.com/js/ckfinder/userfiles/files/76769445249.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_off0000b1d5.bin
e95ef9c1eb1fa0255020a5963dc99ebeec429f3f51f215fb6cd2263b91bde5a8		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB1D5 17332 bytes
font_01_sfnt_off0000de98.bin
0325232119b18bd69393953bcd3cf08107c9cffa6517e36081a6497856da5ade		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDE98 10768 bytes
font_02_sfnt_off0000f72d.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF72D 16792 bytes

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