PDF malware analysis — malicious · 8d54a7a1180e8d0c

MALICIOUS

PDF

80.0 KB Created: 2021-09-20 11:55:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16

MD5: e48c0f4e4780018af8a1d782ff6c76c6 SHA-1: ca18c947632a5a2c17286f4b6f1faad0133927db SHA-256: 8d54a7a1180e8d0c05c694eb7da61aff856ec5a3f3d8a971a7acf6e48c7ea032

66 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

The PDF document contains a high number of embedded URLs pointing to various domains, suggesting a link farm or phishing attempt. The ML classifier strongly indicated maliciousness, and the PDF_SEO_DISPOSABLE_LINK_FARM heuristic confirms the suspicious nature of the links. No scripts were extracted, but the sheer volume of external links indicates a probable attempt to redirect users to malicious content or phishing pages.

Machine Learning

Nyx PDF Classifier malicious score 0.9981

Heuristics 4

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://ketchas.ru/uplcv?utm_term=motorbike+mod+apk PDF link annotation
- https://vigilanciaweb.cl/dinamicos/files/file/30461346303.pdfIn PDF document text
- http://bedrucken24.de/userfiles/file/1713201743.pdfIn PDF document text
- http://greatwalledmond.com/ckfinder/userfiles/files/99899531972.pdfIn PDF document text
- http://aaz.sk/editor_uploads/files/dasukijuxodiwom.pdfIn PDF document text
- https://berbagiangka.com/contents/files/mabazizewugisata.pdfIn PDF document text
- https://estidevelopers.com/wp-content/plugins/super-forms/uploads/php/files/2025142932b4f5693765e830478fc22d/61397049516.pdfIn PDF document text
- http://bordahusfeldolgozo.hu/editor_up/28428044903.pdfIn PDF document text
- http://uro-medical.pl/zdjecia/fotki/file/31346622150.pdfIn PDF document text
- http://ippinnudon.com/uploads/files/losapigire.pdfIn PDF document text
- http://bjsixiang.com/jingkelun/userfiles/files/20210913140720.pdfIn PDF document text
- http://ipsaix.com/ckeditor/ckfinder/userfiles/files/24636687778.pdfIn PDF document text
- http://corporatiegids.nl/uploads/files/75219053398.pdfIn PDF document text
- http://balade-pierry.fr/userfiles/file/dusibavude.pdfIn PDF document text
- http://lighthouse-connection.at/myPix/file/16869482582.pdfIn PDF document text
- https://serrechevalier-skifun.com/imagesfile/54552631956.pdfIn PDF document text
- http://old.arcnet.org.tw/ckfinder/userfiles/files/66246223345.pdfIn PDF document text
- https://spa-salon.ru/ckfinder/userfiles/files/35400831284.pdfIn PDF document text
- http://tuderprogettazione.it/userfiles/files/46805374069.pdfIn PDF document text
- http://termosystem.pl/userfiles/file/3716687149.pdfIn PDF document text
- https://mirrorlink.com/public/files/files/41136917060.pdfIn PDF document text
- https://iwanbim.com/userfiles/files/46872923147.pdfIn PDF document text
- https://eseninternational.com/uploads/files/kubijuxobolerasujirexime.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_off0000d608.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xD608	10460 bytes
SHA-256: `a1f93b46f0bc278dc9a64c523aaaee5d39a438e3a38deea0cf2c48df65a3e216`
`font_01_sfnt_off0000ed8f.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xED8F	17160 bytes
SHA-256: `dfd683476b7639b17d245fcf27b5d8e69f4f48ad128b0f9b7227c5fde65957c9`
`font_02_sfnt_off00011a89.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x11A89	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`

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