PDF malware analysis — malicious · 4836201546353f1b

MALICIOUS

PDF

82.9 KB Created: 2021-09-16 08:04:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07

MD5: ac27bccd42c97e4f37f0928968027f32 SHA-1: 23e92c8c54914e3984f9acc6defc930d953ca953 SHA-256: 4836201546353f1b10ad643de09041f712cc21274e4bdf5ef52e10dd9588cc6f

134 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1059.007 JavaScript

The sample was flagged by ML and ClamAV as malicious, with high confidence. It contains embedded JavaScript and numerous external URIs, many of which are hosted on disposable domains, indicating a link farm designed to redirect users to potentially malicious content. The presence of embedded JavaScript suggests an attempt to execute code within the PDF viewer.

Machine Learning

Nyx PDF Classifier malicious score 0.9955

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://pixomot.ru/uplcv?utm_term=joe+fortune+free+spins PDF link annotation
- https://yukkumpulgroup1.com/contents/files/kolizovavivonozadel.pdfIn PDF document text
- https://buonoantonio.it/userfiles/file/bukotofotowol.pdfIn PDF document text
- http://suspensionestg.mx/userfiles/file/96718061093.pdfIn PDF document text
- http://soosanfix.com/upload/fckeditor/file/23061333130.pdfIn PDF document text
- http://markaz-e-durood.com/EditorImages/file/pimavajikinoraniji.pdfIn PDF document text
- http://xn--e1aazeoc7d.xn--p1ai/images/shared/file/xetekudebuxiduvifivovesaf.pdfIn PDF document text
- http://churchliferesources.org/wp-content/plugins/formcraft/file-upload/server/content/files/1613583f599f87---timizeke.pdfIn PDF document text
- http://around-sicily.net/userfiles/file/nodurifunezoro.pdfIn PDF document text
- http://hibertek.com/image/files/20210904_081445.pdfIn PDF document text
- http://xn--22cjbbm2eyae3ehabdb4kqdtae3dxnnc1fhf.com/user_img/files/botevapoketabowomigek.pdfIn PDF document text
- https://frennphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132977775472---48850693666.pdfIn PDF document text
- http://sportingclubalbinia.eu/userfiles/files/75164565896.pdfIn PDF document text
- https://crossfitbeeshark.ro/app/webroot/files/userfiles/files/61179991916.pdfIn PDF document text
- http://asja-doll.ru/userfiles/file/xuwuj.pdfIn PDF document text
- http://agppi99.pretty-match.com/upload/files/230901821.pdfIn PDF document text
- http://sinoscaform.com/upload/ckimg/files/202109011603528521.pdfIn PDF document text
- http://bsa-billiard.by/images_from_html_editor/file/98802047911.pdfIn PDF document text
- http://eyela.kr/uploadfile/fckeditor/file/19779414809.pdfIn PDF document text
- http://ruizhishengwu.com/uploadfiles/file/071730079872.pdfIn PDF document text
- http://thietbiantoanttk.com/uploads/files/kotilaxuxesap.pdfIn PDF document text
- http://mundori.com/js/ckfinder/userfiles/files/lirupunigaferujeba.pdfIn PDF document text
- https://thietkeweblongan.com/upload/files/derunoxedududawupusiva.pdfIn PDF document text
- http://www.gyndoktors.de/ckfinder/userfiles/files/nejejufurowi.pdfIn PDF document text
- http://test-immo.com/file/97044150149.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_off0000e198.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xE198	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_01_sfnt_off0000f9aa.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xF9AA	17348 bytes
SHA-256: `5eca4d59079c26c6e5be6e840a88fda8e65a4ee18c290cfe51d0e2caafa41439`
`font_02_sfnt_off0001271b.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x1271B	10232 bytes
SHA-256: `ad1e6453b7464ea4f502c3a16687098fa64de2ce8bfec7cf6f6da207778a6620`

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