PDF malware analysis — malicious · dea032ef673c539f

MALICIOUS

PDF

70.7 KB Created: 2021-09-30 17:42:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31

MD5: c8cf4f859cf7b42bcb3b9ee9c9d4f380 SHA-1: 27fccc4d41753929e2483439d89f86f314e75b61 SHA-256: dea032ef673c539ffcb912133c644ce2d67ad5023dcdb760422bd0b7f659f6d9

126 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The sample was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains numerous external URIs and is identified as a link farm, suggesting it is designed to redirect users to potentially harmful websites. The presence of multiple PDF-specific heuristics further supports its malicious nature.

Machine Learning

Nyx PDF Classifier malicious score 0.9975

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://infrive.ru/uplcv?utm_term=anime+free+watch+online+site PDF link annotation
- https://heritran.vn/uploads/news_file/lesetamisisojarosepu.pdfIn PDF document text
- http://sweed-trans.eu/ckfinder/userfiles/files/82047848187.pdfIn PDF document text
- http://mylivediamondinventory.com/uploads/files/82024187402.pdfIn PDF document text
- http://ilovehikari.com/uploads/files/47051113703.pdfIn PDF document text
- https://sunrise-photon.com/upfiles/editor/files/nawowuxusifoninirevo.pdfIn PDF document text
- http://camara.acessoainformacao.org/uploads/ckfinder/files/75733608221.pdfIn PDF document text
- https://dispecom.com/cms_dispecom/sgi_userfiles/userfiles/files/kadezagul.pdfIn PDF document text
- https://tutorsbureau.net/userfiles/file/reviwewetijuj.pdfIn PDF document text
- https://zoldlaptop.hu/ckfinder/userfiles/files/54580600385.pdfIn PDF document text
- https://petandpuppies.com/userfiles/file/85045207142.pdfIn PDF document text
- http://www.ih-consultant.com/ckfinder/userfiles/files/nalojugedokemezodidu.pdfIn PDF document text
- https://dom4m.lv/userfiles/files/vitomululideg.pdfIn PDF document text
- http://culfordequestriancentre.org/UserFiles/file/99434452128.pdfIn PDF document text
- http://meuble-tunisie.com/userfiles/file/40509678064.pdfIn PDF document text
- https://digbijoynath.in/uploads/userfiles/files/likufera.pdfIn PDF document text
- http://keramann.ru/uploads/files/jejukomufuwinumijajelod.pdfIn PDF document text
- http://www.argentum.com/wp-content/plugins/super-forms/uploads/php/files/ab4dtbrjss9ht8lvd8mhh76tn8/57763216506.pdfIn PDF document text
- http://www.training4thefuture.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/161372e7ebcfb7---92051512532.pdfIn PDF document text
- http://familiegravesen.dk/ckfinder/userfiles/files/69577422814.pdfIn PDF document text
- https://www.lipca.com/ckfinder/userfiles/files/75519107041.pdfIn PDF document text
- http://abbuffalowings.com/uploads/files/jefuf.pdfIn PDF document text
- https://romalasergroup.com/userfiles/files/71686794737.pdfIn PDF document text
- http://gpszone.hu/upload/userfiles/file/35830414292.pdfIn PDF document text
- http://esipro.lu/userfiles/file/45391637569.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_off0000b271.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xB271	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_01_sfnt_off0000ca83.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xCA83	16424 bytes
SHA-256: `30b18a69d1eff8bbde7715ffdf6227d0f1fee0a4d83d2bd4b1f860c226f11fb3`
`font_02_sfnt_off0000f4bb.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xF4BB	10668 bytes
SHA-256: `bb3f4785aa9217d8dea67d4a4cdd4e4fff78eff1ee74c7dec80d947e6cf55e7d`

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