PDF malware analysis — malicious · d5a1f924af5f0833

MALICIOUS

PDF

85.7 KB Created: 2021-09-12 21:45:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16

MD5: 5643317e54769d65de451d7256cb0324 SHA-1: 1f76c9d14df6d5fc0a2544ef0c335dab74e3f449 SHA-256: d5a1f924af5f0833b87f4c014ee27f8ec4d70378296ce98d0b9accdf00c64ad2

134 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many pointing to disposable domains, indicating a link farm designed to obscure malicious destinations. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware delivery. The embedded JavaScript is likely used to facilitate redirection or exploit vulnerabilities.

Machine Learning

Nyx PDF Classifier malicious score 0.9976

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 http://veterky.ru/ckfinder/userfiles/files/tuxiwugipa.pdf In PDF document text
- https://mp2020.csysadmin.com/ckfinder/userfiles/files/kuragodatirifuzed.pdfIn PDF document text
- http://www.emploi.nat.tn/ckeditor/ckfinder/userfiles/files/temolule.pdfIn PDF document text
- http://smolninskayahotel.com/userfiles/file/joxudifoz.pdfIn PDF document text
- http://lagrupacio.cat/file/gezofepubedigapox.pdfIn PDF document text
- https://nffcd.org/userfiles/files/tunewapetotafanarakanij.pdfIn PDF document text
- https://gastriklandsbf.se/UserFiles/files/powopadoreg.pdfIn PDF document text
- https://sunriseinnjasper.com/nbloom/fckuploads/file/wisonesezosapizubogiv.pdfIn PDF document text
- https://www.dynasil.com/wp-content/plugins/super-forms/uploads/php/files/4938057f53aa8667c75d4e65f335ab65/nekukiwapoxomuge.pdfIn PDF document text
- https://rdsdealers.com/ckfinder/userfiles/files/jinijikozomi.pdfIn PDF document text
- https://alcc.vn/wp-content/plugins/super-forms/uploads/php/files/0ujfhtc07pl0krthl4tahlv3e8/lajidixipipawesimifade.pdfIn PDF document text
- https://moveo-sport.pl/userfiles/file/jefodituzojekapo.pdfIn PDF document text
- https://pre-www.bridge-academy.com/uploaded/ckeditor/files/wuxuzavoxijifov.pdfIn PDF document text
- http://anonelectronics.com/admin/fckeditor/editor/filemanager/connectors/php/upload_jpg/file/202109050307123719.pdfIn PDF document text
- https://deycaterers.com/ckfinder/userfiles/files/12719840373.pdfIn PDF document text
- https://skywaynepal.com/userfiles/file/ramutasosonazeni.pdfIn PDF document text
- https://nepalipublisher.com/ckfinder/userfiles/files/waxanonarusovogozi.pdfIn PDF document text
- https://akamercedes.com/images/uploads/files/derilosusanon.pdfIn PDF document text
- http://kprmk.pl/userfiles/file/90788345026.pdfIn PDF document text
- http://aviapartner.biz/js/ckfinder/userfiles/files/gurunuzifonegikixedudifeg.pdfIn PDF document text
- http://aptwash.com/userData/ebizro_board/file/3846387030.pdfIn PDF document text
- http://kaizenlife.com/ckfinder/userfiles/files/pufibedoveropotegexadeb.pdfIn PDF document text
- http://gaziogluenerji.com/images_upload/files/37302490173.pdfIn PDF document text
- https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=chrome+dark+mode+in+pcPDF link annotation
- 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_off0000eab0.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xEAB0	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_01_sfnt_off000102c7.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x102C7	10588 bytes
SHA-256: `7fc0fde8f7467c70990f035e2ad9ae1b0702c30905662c1a616b341c69258080`
`font_02_sfnt_off00011ab7.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x11AB7	18336 bytes
SHA-256: `34ac16a0440d0d4c9003e760ac63225f54383cc262d39c22bc2c7873889818d1`

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