PDF malware analysis — malicious · 5c8a11644d98b659

MALICIOUS

PDF

81.2 KB Created: 2021-10-06 10:53:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24

MD5: 030837652baaf688ebf1cab9410633ee SHA-1: aee067b87b758478b5e3d3242a7a32a3a58548a9 SHA-256: 5c8a11644d98b659abab49afdffc42cd2aaffc81fc295ea2ef47b4f7e8826869

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 and an ML classifier, indicating malicious intent. The PDF contains a large number of embedded URIs, many of which point to disposable hosting, suggesting a link farm designed to redirect users to malicious sites. The presence of numerous external URIs and the PDF_SEO_DISPOSABLE_LINK_FARM heuristic strongly indicate a phishing or malware distribution campaign.

Machine Learning

Nyx PDF Classifier malicious score 0.9948

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://cructi.ru/uplcv?utm_term=its+inconspicuous+presence PDF link annotation
- https://curvy.tw/upload/files/jujetoguteguk.pdfIn PDF document text
- https://www.drserapkagan.com/wp-content/plugins/super-forms/uploads/php/files/2k23ope0jn6o2laoftei5ps1s1/93042920868.pdfIn PDF document text
- http://bixenony.com/userfiles/files/xuxalitad.pdfIn PDF document text
- http://sfssolution.com/userfiles/file/kuxerilekagibowejirunidut.pdfIn PDF document text
- http://kfbma.org/files/fck/file/34187806688.pdfIn PDF document text
- http://xyr59.com/filespath/files/20210927123251.pdfIn PDF document text
- http://ksklinika.ru/ckfinder/userfiles/files/60949890485.pdfIn PDF document text
- http://humidorio.de/ckfinder/userfiles/files/65186000748.pdfIn PDF document text
- http://plafondchauffant.fr/img/user/file/91703628168.pdfIn PDF document text
- http://originalcheck.it/public/img_admin/file///8638284678.pdfIn PDF document text
- http://jd6618.com/jd6618/file/2021-9/file/LwpCms2021_09_16_19_57_10_9604.pdfIn PDF document text
- https://koparieshorvathbusz.hu/files/file/sexevirafilusamopekefe.pdfIn PDF document text
- http://huh.hu/UserFiles/File/16662957492.pdfIn PDF document text
- http://csim.jp/ckeditor/uploads/files/2005446991.pdfIn PDF document text
- http://markfarolaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/daloxumaxoxak.pdfIn PDF document text
- https://congnghiepxd204.vn/upload/files/29496109014.pdfIn PDF document text
- http://getsolarny.com/userfiles/file/nevukipik.pdfIn PDF document text
- http://lamelove-zakryti.cz/userfiles/file/detamalegakep.pdfIn PDF document text
- http://simp-q.ru/userfiles/file/49213216176.pdfIn PDF document text
- https://learningsolution.ca/userfiles/files/1095085235.pdfIn PDF document text
- https://synersys.fr/contenu/file/zowadugoxoroduxemud.pdfIn PDF document text
- http://energywork.pl/userfiles/file/jukodozebozoj.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 4

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`font_00_sfnt_off0000c5ca.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xC5CA	2680 bytes
SHA-256: `2d5ff628103667c74862fa8e2db4439410f973b653046c3bf23b549c4838c6db`
`font_01_sfnt_off0000d0f2.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xD0F2	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_02_sfnt_off0000e909.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xE909	10208 bytes
SHA-256: `0d29dad03200599a8ca087ae12b666acabd22f41160b992434957429ea44ac22`
`font_03_sfnt_off0001000d.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x1000D	20544 bytes
SHA-256: `c2c4a0522b95636b7b91f12d5eae71086c77b22f0c2806cbe3259f5804103c6b`

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