PDF malware analysis — malicious · ca862042ff470f61

MALICIOUS

PDF

86.7 KB Created: 2021-09-17 03:29:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27

MD5: 463ed3d08c068f798db81d7ccedee10a SHA-1: 5d911079c251b563281a0b97d2e1d33671cb54da SHA-256: ca862042ff470f61fce24ed9698b152e47332a4d79f762f0735f9095552cb192

82 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, a common technique for executing malicious code within documents. The ML classifier strongly indicated maliciousness, and the presence of numerous external URIs, many on disposable hosting, suggests a link farm or phishing lure. The embedded JavaScript likely serves to redirect the user to one of these external sites, potentially for further exploitation or credential harvesting.

Machine Learning

Nyx PDF Classifier malicious score 0.9974

Heuristics 6

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.
Urgency / deadline lure low SE_URGENCY_LURE

Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
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=alien+from+mortal+kombat PDF link annotation
- http://faurerom.com/userfiles/file/71636885179.pdfIn PDF document text
- http://jiangsutravel.kr/userfiles/files/20210910_190233.pdfIn PDF document text
- http://taiwangallant.com/uploads/files/202109081253406651.pdfIn PDF document text
- http://abovomedia.hu/_user/file/77821901419.pdfIn PDF document text
- http://9jamail.com/FCKeditor/editor/filemanager/connectors/userfiles/file/nugikejaziwebox.pdfIn PDF document text
- http://laulumaja.fi/ckfinder/userfiles/files/19127782394.pdfIn PDF document text
- https://www.hasmow.com.au/application/third_party/ckfinder/userfiles/files/pamaxidapezij.pdfIn PDF document text
- http://genarchi.com/data/temp/file/pafijilolelinela.pdfIn PDF document text
- https://festival-bg.com/media/ckuploads/files/lumesawatul.pdfIn PDF document text
- https://rosycaffe.com/file/boditupotokiviwokutajunew.pdfIn PDF document text
- http://lamorenj.com/userfiles/file/3124958539.pdfIn PDF document text
- http://tcsklife.com/filespath/files/20210906110648.pdfIn PDF document text
- http://motoren-adachi.com/js/upload/files/6790235989.pdfIn PDF document text
- https://riverasphotovideo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a0d74b90f6---dikaraki.pdfIn PDF document text
- http://chocolatycakes.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614306387e443---sozosunejaruxo.pdfIn PDF document text
- https://lamaisonducoeur.ca/upload/editor/file/kikinowewojidaxabaned.pdfIn PDF document text
- https://wtmasonry.com/ckfinder/userfiles/files/xanoxojezifexawonofalena.pdfIn PDF document text
- http://firmykominkowe.pl/Obrazki/edytor/file/11280494051.pdfIn PDF document text
- http://vasset.bg/userfiles/file/10863076733.pdfIn PDF document text
- https://buildingexpertsdirectory.com/ckfinder/userfiles/files/nozuxolijuv.pdfIn PDF document text
- http://itkaufmann.com/images/fckimages/file/86090205730.pdfIn PDF document text
- http://yuanjiangchem.com/upload/files/fopejesugadexilolufe.pdfIn PDF document text
- http://mutamobilya.com/images_upload/files/59093696003.pdfIn PDF document text
- https://enilubricant.hoakhanh.vn/uploads/image/files/pafawiru.pdfIn PDF document text
- https://easyown.ddproperty.com/datas/files/70335858414.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_off0000edb0.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xEDB0	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_01_sfnt_off000105c2.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x105C2	18204 bytes
SHA-256: `87cabe104c72849405a9a71c5e7ccbe7371bd19310df89c1092b8eea19c19d52`
`font_02_sfnt_off0001359c.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x1359C	10420 bytes
SHA-256: `373a9c7efa0215bccbf7030e5efa7c25d2794ec0b17e1a811042dc58d8f93a31`

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