PDF malware analysis — malicious · a9c4a60ff9a17045

MALICIOUS

PDF

85.3 KB Created: 2021-09-13 17:37:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05

MD5: 2ba0b1ddaf304c44244792a899c4e028 SHA-1: d7e0e40288fbd98cd50a3b4f4e0494b80e319d16 SHA-256: a9c4a60ff9a1704589e5f79ddb6c868d9ea11371018e0c8007faf9fca11caedb

134 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which are hosted on unknown or suspicious domains. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic indicates a high number of distinct hosts and links, suggesting a link farm designed to obscure the true malicious destination. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware delivery via these links.

Machine Learning

Nyx PDF Classifier malicious score 0.9974

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://cursosadistanciayonline.com/medios/files/vizunetu.pdf In PDF document text
- https://anninhsieuthi.online/upload/files/53327899963.pdfIn PDF document text
- https://yastudio.net/wp-content/plugins/super-forms/uploads/php/files/7a3371530dbc5d6c729be8d342b53570/26915909082.pdfIn PDF document text
- http://gdfsztal.com/uploadfile/files/41435063709.pdfIn PDF document text
- http://zoltysnieg.pl/pliki_wyswig/files/burizuxaganesam.pdfIn PDF document text
- http://bartuceviri.com/userfiles/file/jetuzitopikumeti.pdfIn PDF document text
- http://phutungvespaco.com/luutru/files/tisameferi.pdfIn PDF document text
- https://grandplaza.bg/uploads/assets/file/40804342127.pdfIn PDF document text
- http://goodtraefarm.com/ckupload/files/21811907041.pdfIn PDF document text
- http://bscartridge.com/pic/tuxutazorodetafiz.pdfIn PDF document text
- https://turismopontevedra.com/ckfinder/userfiles/files/72146583206.pdfIn PDF document text
- https://traffictkt.com/viking1/uploads/files/175467600.pdfIn PDF document text
- http://www.rlktechniek.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1613e3388b6e12---11789704871.pdfIn PDF document text
- http://infinity-pro.ru/userfiles/file/robebedi.pdfIn PDF document text
- https://fleschimmo.lu/userfiles/files/pufukijepugepomejov.pdfIn PDF document text
- http://encino.kopanramen.com/uploads/files/89916039618.pdfIn PDF document text
- http://koovappadyscb.com/ckfinder/userfiles/files/58774886887.pdfIn PDF document text
- http://sprinter-lab.ru/content/File/48705970550.pdfIn PDF document text
- https://divetechmarine.com/contents/files/87306261796.pdfIn PDF document text
- https://huaku3c.tw/uploads/files/202109082045403374.pdfIn PDF document text
- http://srs-budapest.hu/uploads/files/80147090466.pdfIn PDF document text
- https://linlinline.biz/js/ckfinder/userfiles/files/pufufusux.pdfIn PDF document text
- http://matstravel.ru/userfiles/file/10502508526.pdfIn PDF document text
- https://phunhai.net/upload/files/31440345159.pdfIn PDF document text
- https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=windows+program+androidonPDF link annotation
- 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_off0000e4fc.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xE4FC	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_01_sfnt_off0000fd0e.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xFD0E	19784 bytes
SHA-256: `ae79f93b27b23b3a8e6524037dce52bd444ab681abed5b30ba25d513443354c2`
`font_02_sfnt_off00012e21.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x12E21	10540 bytes
SHA-256: `8c256af107ffe2a7f438cf4b7c18fab83c6daa0dfb944b9894e7327a4a336293`

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