PDF malware analysis — malicious · f0d0b66761bed768

MALICIOUS

PDF

83.2 KB Created: 2021-09-15 03:17:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14

MD5: 1c53f225f993f6bbde74c54129e354f0 SHA-1: e078cec723e206c8bad506c53601f5e777952229 SHA-256: f0d0b66761bed768966b84e7a35234c05d0a406f00903269fc4a56a6ade2e24e

134 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

The sample was detected by ClamAV as Pdf.Phishing.Trojan and flagged by an ML classifier, indicating malicious intent. The presence of an embedded JavaScript stream (PDF_JS) strongly suggests that the PDF is designed to execute code, likely to redirect the user to one of the numerous external URLs found within the document. These URLs are likely part of a phishing campaign or a malware distribution scheme.

Machine Learning

Nyx PDF Classifier malicious score 0.9956

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://huntic.ru/uplcv?utm_term=worksheet+writing+and+balancing+chemical+reactions PDF link annotation
- https://santaclara.com/wysiwygfiles/file/92568567522.pdfIn PDF document text
- https://urologasdainys.lt/userfiles/file/15048193398.pdfIn PDF document text
- http://gardenofsound.com/userfiles/files/95145077104.pdfIn PDF document text
- http://aajude.pt/backoffice/ckfinder/userfiles/files/55116280662.pdfIn PDF document text
- http://eyela.kr/uploadfile/fckeditor/file/79247762505.pdfIn PDF document text
- https://currenwatch.myhost360.cn/file/upload/files/09-08-12-22-37-22.pdfIn PDF document text
- http://zatexpress.com/upload/userfiles/files/44959758857.pdfIn PDF document text
- http://llux.vn/uploads/files/fawafutepasojikot.pdfIn PDF document text
- https://lombardpruszkow.pl/local/userfiles/file/77192022267.pdfIn PDF document text
- http://scuderia512.com/js/upload/files/26094532117.pdfIn PDF document text
- http://roycraft.ca/userfiles/file/murivamosemezukugona.pdfIn PDF document text
- http://khocabien.com/uploads/files/29321520999.pdfIn PDF document text
- http://revucue.com/ckfinder/userfiles/files/99911927065.pdfIn PDF document text
- https://udachi.co.th/wp-content/plugins/super-forms/uploads/php/files/j2hhbr8l7f4oi667ntruuioige/75181471089.pdfIn PDF document text
- https://maintogelonline2.com/contents/files/gadetajujidipi.pdfIn PDF document text
- https://webmodels.studio/wp-content/plugins/formcraft/file-upload/server/content/files/16135ba1975fe8---25037395959.pdfIn PDF document text
- http://sqc.jp/user_data/editor/ckfinder/core/connector/php/upload/files/85612931371.pdfIn PDF document text
- http://tipsclubcr.com/campannas/file/kidovuxurukosakisaf.pdfIn PDF document text
- http://khiconghoixuancong.com/Khicong/admin/userfiles/file/26564862973.pdfIn PDF document text
- https://garnizone.com/userfiles/file/91252898058.pdfIn PDF document text
- http://movitecnic.fr/ressource/site-image/files/dononadaxotafidoro.pdfIn PDF document text
- https://aordonez.com/images/contenidos/files/52290896261.pdfIn PDF document text
- http://businessnavigator.in/ckeditor/uploads/files/sevukoviw.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_off0000dcc3.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xDCC3	11128 bytes
SHA-256: `d5c72895e0b181b3d66b3f6d5c207b32dd1bfddf3e5070f13684e28358458285`
`font_01_sfnt_off0000f66f.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xF66F	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_02_sfnt_off00010e81.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x10E81	18580 bytes
SHA-256: `d2dcd5e52cbc776f50df52997f9240b2a35a08bceca3cd0a656afc48815bedb4`

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