PDF malware analysis — malicious · 7a1e82f8afd9b105

MALICIOUS

PDF

92.4 KB Created: 2021-09-16 23:32:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12

MD5: 5182abf6bb3bd533a1d364b3c53ee4e3 SHA-1: 82c31fd7f5821983dbb49b9c2873dea4544c5a82 SHA-256: 7a1e82f8afd9b105a7d82aa09a12252d18a461c1cb409829c12b23ef516ffd8a

134 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which are hosted on disposable domains, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. The embedded JavaScript is likely used to facilitate the redirection to these malicious sites.

Machine Learning

Nyx PDF Classifier malicious score 0.9971

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://santiagoporter.com/js/ckfinder/core/connector/php/files/86896185694.pdf In PDF document text
- http://domkomplekt34.ru/attachments/file/xifagagopewelag.pdfIn PDF document text
- https://www.piramideidiomas.com/ckfinder/userfiles/files/dukimina.pdfIn PDF document text
- http://355353.ru/userfiles/file/zilesabanisi.pdfIn PDF document text
- http://studioguagnoni.it/userfiles/files/93648269055.pdfIn PDF document text
- https://dbhattacharjee.com/ckfinder/userfiles/files/66529178385.pdfIn PDF document text
- https://kalatranslation.co.uk/wp-content/plugins/super-forms/uploads/php/files/c415219913kr9d15841gn8sbgp/felesaxodewowalibaverod.pdfIn PDF document text
- http://www.whirlpool-beachcomber.at/wp-content/plugins/formcraft/file-upload/server/content/files/1613f96a1b19fe---wabuvimepa.pdfIn PDF document text
- https://www.barrau-philippe-sedeco.fr/ckfinder/userfiles/files/jufoxoziliv.pdfIn PDF document text
- http://thesecurityguardunion.ca/userfiles/files/79087225303.pdfIn PDF document text
- http://reversetheclocknow.com/ckfinder/userfiles/files/27026445542.pdfIn PDF document text
- http://idevicesplus.nl/app/webroot/files/userfiles/files/28892503435.pdfIn PDF document text
- http://fskyok.com/uploadfile/files/71891407433.pdfIn PDF document text
- http://adams-gold.ru/archive/image/file/jupabinovetuleramepuguxi.pdfIn PDF document text
- http://fuhua.tumujike.com/assets/upload/files/202109021301349327.pdfIn PDF document text
- http://massimobertoarchitetto.com/userfiles/files/kisitebobobukenil.pdfIn PDF document text
- https://contact-house.com/fckeditor/upload/file/xolewutorikefal.pdfIn PDF document text
- http://pekbdt.com/filespath/files/20210915203544.pdfIn PDF document text
- http://badischer-kunstverein.de/ckfinder/userfiles/files/27999908810.pdfIn PDF document text
- http://imdad-egypt.com/userfiles/file/dilexolasigoverovub.pdfIn PDF document text
- https://semangkamerah.com/contents/files/43337614141.pdfIn PDF document text
- http://orthodoxvaidikasanghom.org/userfiles/file/44273030865.pdfIn PDF document text
- http://thepokeluau.com/uploads/files/76179965204.pdfIn PDF document text
- https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=redmi+note+9+pro+ultra+wide+anglePDF 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_off0000fdfc.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xFDFC	20092 bytes
SHA-256: `7610266352578ba5746aa89e7f59d5db757f29301ea2fde18f6226a3972155b4`
`font_01_sfnt_off00013270.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x13270	10968 bytes
SHA-256: `f971e2a6c292ed93d665f748d9c4e31b320e6378a2c164e6b3f4d20245cb0204`
`font_02_sfnt_off00014bb8.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x14BB8	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`

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