PDF malware analysis — malicious · 6c5d120706f205e5

MALICIOUS

PDF

85.1 KB Created: 2021-09-16 11:11:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31

MD5: a509eb845755ec6575e8408af06022b9 SHA-1: 7ae075779ad6bbf5bcd29a05570da6f4e9301b53 SHA-256: 6c5d120706f205e5a8c6fedc435a2b16452ec01a9d9cfc6bd11e6ccc55dedabc

126 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics, including a high-confidence ML classifier and ClamAV detection, indicating malicious intent. The PDF contains numerous embedded URLs, many of which are part of a link farm hosted on disposable domains, suggesting a phishing or scam campaign. The presence of external URIs and the link farm structure strongly indicate an attempt to redirect users to malicious sites.

Machine Learning

Nyx PDF Classifier malicious score 0.9980

Heuristics 5

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.
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://oniceh.ru/uplcv?utm_term=best+tts+app+android PDF link annotation
- http://7serve.org/userfiles/file/20210916034246.pdfIn PDF document text
- http://petukmahaaaraj.com/userfiles/file/41534471898.pdfIn PDF document text
- http://khocabien.com/uploads/files/rotuxubukorukof.pdfIn PDF document text
- http://nmways.com/uploads/fckupload/file/92405413888.pdfIn PDF document text
- http://nbc.com.vn/ckfinder/userfiles/files/bovuvodesetubefeza.pdfIn PDF document text
- https://renetravel.ro/images/files/rebukupexaraw.pdfIn PDF document text
- http://talcmanagement.com/uploaded_files/userfiles/files/58503151641.pdfIn PDF document text
- http://altinay-law.com/images/file/vufixujatijivemizen.pdfIn PDF document text
- https://ever.dacola.com/upload/files/50598176755.pdfIn PDF document text
- http://abworder.com/uploads/files/6294856085.pdfIn PDF document text
- http://www.gpkoaee.ru/ckfinder/userfiles/files/57671761051.pdfIn PDF document text
- http://epoptavky.com/is/images/FCKeditor/File/88042053649.pdfIn PDF document text
- http://fsgzb.com/upfolder/e/files/20210910224410.pdfIn PDF document text
- http://md-servicios.com/userfiles/file/gixemoj.pdfIn PDF document text
- https://rt-totaalafbouw.nl/userfiles/file/sakodedoromaxusisa.pdfIn PDF document text
- http://montaze.org/democms/userfiles/file/91148326664.pdfIn PDF document text
- http://dailycan.com/userfiles/files/8584959345.pdfIn PDF document text
- http://kingbikeonline.com/images/upload/File/pavajim.pdfIn PDF document text
- http://musicpark-live.com/userfiles/file/2183074965.pdfIn PDF document text
- http://duythuc-bearing.vn/uploads/userfiles/file/75266927139.pdfIn PDF document text
- http://saeronbio.com/userData/board/file/90070012226.pdfIn PDF document text
- http://robertoantoniz.com/resources/original/file/tifesujusorurovoxerijak.pdfIn PDF document text
- http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
- http://purl.org/dc/elements/1.1/In PDF document text
- http://ns.adobe.com/pdf/1.3/In PDF document text
- http://ns.adobe.com/xap/1.0/In PDF document text
- http://ns.adobe.com/xap/1.0/mm/In PDF document text
- http://ns.adobe.com/xap/1.0/rights/In PDF document text
- http://dejavu.sourceforge.netIn PDF document text
- http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`font_00_sfnt_off0000eacc.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xEACC	17180 bytes
SHA-256: `00057220cb31fce81c301603ca5963271b321521b83c954559d9422b10d0eab1`
`font_01_sfnt_off00011727.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x11727	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_02_sfnt_off00012f3e.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x12F3E	10392 bytes
SHA-256: `a493b754763fb10e7e962ed7cf156f7a2028e1d01eafb3c60a8e20a4704407eb`

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