PDF malware analysis — malicious · 169cbd0a28b8ec92

MALICIOUS

PDF

73.1 KB Created: 2021-09-12 03:49:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23

MD5: 4a6d885ef6acbfafc7f4c1592d5dfbe5 SHA-1: 6e41e423da3bf5c35a7ee206b472b358aefc4a9b SHA-256: 169cbd0a28b8ec92c7d2e2f36dda11b35bd3694080315c1bd0843b83757016e1

134 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

The sample was flagged by ClamAV as Pdf.Phishing.Trojan and a machine learning classifier indicated a high probability of maliciousness. The PDF contains embedded JavaScript and a large number of external URLs, many of which appear to be part of a link farm designed to redirect users. This suggests the primary purpose is to redirect users to malicious sites or to download further malicious content.

Machine Learning

Nyx PDF Classifier malicious score 0.9973

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://medvor.ru/uplcv?utm_term=beyblade+best+game PDF link annotation
- https://lotusmarinevn.com/upload/files/10998200836.pdfIn PDF document text
- https://aldapa.eus/files/galeria/files/46371815371.pdfIn PDF document text
- https://kozhikodedeaf.org/admin/my_files/file/1493288629.pdfIn PDF document text
- http://year-c.com/upload_fck/file/2021-9-2/20210902070448542641.pdfIn PDF document text
- https://congchunghadong.com/uploads/files/fotiwu.pdfIn PDF document text
- https://eletroluz-al.com/_IMG/img_internas/file/wedejatanujilefem.pdfIn PDF document text
- https://www.d-table.com/wp-content/plugins/super-forms/uploads/php/files/e80feefd3dda748df8837979fb26951b/76641180320.pdfIn PDF document text
- http://danies.ru/ckfinder/userfiles/files/59282775246.pdfIn PDF document text
- http://studiostocchi.eu/userfiles/files/88569000145.pdfIn PDF document text
- http://rubivina.com/Images_upload/files/topowata.pdfIn PDF document text
- https://weyergans-hcc.lv/userfiles/file/91532655482.pdfIn PDF document text
- http://soosanfix.com/upload/fckeditor/file/kozukufifijorawabanij.pdfIn PDF document text
- http://dwallacelaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/wopitadevabaramunoril.pdfIn PDF document text
- https://medgal.pl/admin/ckfinder/userfiles/files/27305443490.pdfIn PDF document text
- http://handinks.com/ckfinder/images_store/files/gaxedovuta.pdfIn PDF document text
- http://domgr11.ru/uploads/files/34661530344.pdfIn PDF document text
- http://yds-wcv.jp/free_images/files/38640256700.pdfIn PDF document text
- https://keiba-like.biz/js/ckfinder/userfiles/files/39174856372.pdfIn PDF document text
- https://flylights.pl/wp-content/plugins/super-forms/uploads/php/files/vbuth5tgj3e37v8dafp4l7ifvq/nufaroli.pdfIn PDF document text
- http://dakhoanhanai.com/images/files/69236677666.pdfIn PDF document text
- https://rainbowprinter.com/app/webroot/files/file/pojaretogomebor.pdfIn PDF document text
- http://recko.ru/ckfinder/userfiles/files/37908882962.pdfIn PDF document text
- https://nieruchomosciprzetargi.pl/files/file/92895442108.pdfIn PDF document text
- https://vleek.com/uploads/files/1939002607.pdfIn PDF document text
- https://eccdc.org/application/webroot/userfiles/file/tuvopedijupukarefufepol.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_off0000baed.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xBAED	17204 bytes
SHA-256: `77a6eb7d9f70d8129d88d8ef0581f3ac3d6e1838ea11a96d216b7aa776109f65`
`font_01_sfnt_off0000e6ac.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xE6AC	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_02_sfnt_off0000fec3.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xFEC3	10480 bytes
SHA-256: `4c2db269252525cdefbd5b0eae29224cc4ab626d57d60e8f56b2a96677c71bdf`

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