Malicious PDF — malware analysis report

Static analysis result for SHA-256 4018a43eaec46c06…

MALICIOUS

PDF

77.0 KB Created: 2021-09-19 18:30:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 668a367c7ba68bfc824c138e012f1dbe SHA-1: 862d472e2121ccccdd216a2414219818e7e6c519 SHA-256: 4018a43eaec46c067fdc3238a6853f80c8d7657d3cc5dac950131956b4cb1f96
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics, including a critical ClamAV detection for 'Pdf.Phishing.Trojan' and an ML classifier indicating maliciousness. The presence of numerous external URIs, many hosted on disposable domains and employing UTM parameters, strongly suggests a phishing or link-farming campaign. The file's structure and embedded content indicate it's designed to redirect users to potentially harmful websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

Heuristics 5

  • 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.
  • 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://cructi.ru/uplcv?utm_term=modern+combat+5+mod+apk+unlimited+money
    • https://bunian-co.com/other_files/File/28730623289.pdf
    • http://hylimusic.com/fckeditor/editor/filemanager/connectors/php/userfiles/file/kadunofinimuga.pdf
    • http://chagatea.ru/wp-content/plugins/super-forms/uploads/php/files/cec3c65628efa492fd949031dc5d9a5a/11621824304.pdf
    • http://eot.mn/uploads/userfiles/files/31119296614.pdf
    • http://tencanpowder.com/d/files/kitedazipevufetatulonane.pdf
    • http://alacartedesign.de/userfiles/file/zajifesevesipipokepomakun.pdf
    • http://gavinlawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/89474886796.pdf
    • http://www.integra-cr.cz/administrace/ckfinder/userfiles/files/95619065833.pdf
    • https://vakukh.ru/wp-content/plugins/super-forms/uploads/php/files/850d01368fced605d02fde099757cd23/57615801986.pdf
    • http://sdes.in/uploads/18065871154.pdf
    • http://carrozzeriardue.it/userfiles/files/jajapokomagegosadawit.pdf
    • https://www.abandassociates.com/ckfinder/userfiles/files/2411863201.pdf
    • https://www.oalysa.cz/ckfinder/userfiles/files/debitur.pdf
    • http://grimastone.ru/files/55263887689.pdf
    • http://dongduong.net/Images_upload/files/mazidalejetik.pdf
    • http://logopeda-empatia.pl/content/file/37738512465.pdf
    • http://zaun-produzent.de/userfiles/file/34538245285.pdf
    • http://calisnt.com/uploads/files/68835655441.pdf
    • http://problemconsulting.com/img/download/files/dadek.pdf
    • http://hydrem.ru/images/file/78507028738.pdf
    • http://szigmetal.hu/editor_up/kakule.pdf
    • https://gamedunyasi.com/calisma2/files/uploads/15554422.pdf
    • http://theprojectmanagement.guru/cote_dor_import/admin/ckfinder/userfiles/files/77951044506.pdf
    • http://studiomontironi.eu/userfiles/files/27764236926.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_off0000c725.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC725 16792 bytes
font_01_sfnt_off0000df37.bin
dd20af4a41a512492d4d6ab7194be319c115317f68819c75df5a022163a811d1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDF37 17532 bytes
font_02_sfnt_off00010cae.bin
baa5da3765c81fa5d0b780d1d6fa56b8a9fb514d9d92aeb7c7409f09566cc144		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10CAE 11080 bytes

Open this report in the interactive analyzer, or submit your own file for analysis.