PDF malware analysis — malicious · e93ddef5217bfc6d

MALICIOUS

PDF

75.5 KB Created: 2021-09-12 05:52:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27

MD5: 17147607a25897f48a1c1dbb0a9af693 SHA-1: 890fa3f037560f673000b7cd0c18e7d957177fd5 SHA-256: e93ddef5217bfc6d943eb7d0bd4616cc9e496e11101403eb3d58fb0e6b760df8

134 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

The sample was detected as malicious by ClamAV and an ML classifier, and it contains embedded JavaScript. The JavaScript likely redirects the user to external URLs, as indicated by the PDF_URI and EMBEDDED_URL heuristics. The PDF also functions as a link farm, with numerous external URIs pointing to potentially malicious content.

Machine Learning

Nyx PDF Classifier malicious score 0.9947

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://wastran.ru/uplcv?utm_term=video+collage+android PDF link annotation
- https://krossi.ru/images/content/files/nagoxidipuvu.pdfIn PDF document text
- http://vinhhangvien.com/upload/files/15432405318.pdfIn PDF document text
- http://lexxyin.net/files/fckeditor/file/lajivijekop.pdfIn PDF document text
- http://huh.hu/UserFiles/File/puxojisusajagesiko.pdfIn PDF document text
- http://marikitaberbagi.com/userfiles/file/nabufereratoxadava.pdfIn PDF document text
- https://semsaesp.com/ckfinder/userfiles/files/tidulerafesasi.pdfIn PDF document text
- http://gok-maciejowice.pl/js/ckfinder/userfiles/files/31370614008.pdfIn PDF document text
- http://zapatosperezcabrera.com/ckfinder/userfiles/files/najituv.pdfIn PDF document text
- http://avon-bratislava.com/files/files/fegak.pdfIn PDF document text
- http://wwsm-hk.com/files/file/17002688618.pdfIn PDF document text
- http://apothepharma.com/upload/files/zopomon.pdfIn PDF document text
- https://deltaguvenlik.net/userfiles/file/18740597954.pdfIn PDF document text
- https://lnpro.in/ckfinder/userfiles/files/dorofabufesato.pdfIn PDF document text
- https://bakwanudang.com/contents/files/47484811550.pdfIn PDF document text
- https://edinburghpools.com/contents/files/duratodisimolarino.pdfIn PDF document text
- http://quatangsongvan.com/hinhanh_fckeditor/file/28183844193.pdfIn PDF document text
- http://3bbb.fr/ckeditor/upload/files/5469155040.pdfIn PDF document text
- http://kanizsakran.hu/userfiles/file/kaxeke.pdfIn PDF document text
- https://ntiverification.com/userfiles/file/21747654208.pdfIn PDF document text
- https://zlato-stribro-investice.com/upload/files/65783408295.pdfIn PDF document text
- https://rrvchefs.com/wp-content/plugins/super-forms/uploads/php/files/46782f5a7d4fc50563767df27e72e6d2/tidupa.pdfIn PDF document text
- http://heyumpnd.com/userfiles/file///49937100738.pdfIn PDF document text
- http://myappartement.de/web/editor/files/8239002146.pdfIn PDF document text
- http://taaltoetsvo.nl/userfiles/file/bizofesamijodimawiriguv.pdfIn PDF document text
- https://www.assessment.unibe.ch/app/webroot/js/ckfinder/userfiles/files/2557712569.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_off0000c501.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xC501	17512 bytes
SHA-256: `6765a0f32aa608bd7f25c867267b7428a39cea13ec4d95230b9091a67b97406e`
`font_01_sfnt_off0000f1ad.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xF1AD	10248 bytes
SHA-256: `62bf826eef1e0b76e4ac1f61e3dc81d2a3623ce15bdcb6038b5b0bac9aeec210`
`font_02_sfnt_off0001088a.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x1088A	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`

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