PDF malware analysis — malicious · 126815293c2bd2d6

MALICIOUS

PDF

78.1 KB Created: 2021-10-05 16:45:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25

MD5: 1233c03b9224af0d6bc88a108732bf03 SHA-1: 8001c16fead339ff960ba76c609a1f0c14d3d70b SHA-256: 126815293c2bd2d65d3ca8927a1a7ea1839ea226d5ccaa68385e9ad5e9e48a45

134 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external links, many of which point to disposable domains and appear to be part of a link farm. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or distributing further malware. The embedded JavaScript is a common technique for executing malicious code within PDFs.

Machine Learning

Nyx PDF Classifier malicious score 0.9917

Heuristics 6

ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
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://crysiq.ru/uplcv?utm_term=algebra+1+functions+test+answers PDF link annotation
- https://www.hdcorp.com.br/wp-content/plugins/super-forms/uploads/php/files/ee555u5hhkdq6hnu1s9c2qk4d3/zukuro.pdfIn PDF document text
- https://shatalarab-llc.net/userfiles/files/52204068456.pdfIn PDF document text
- http://fecoil.com/userfiles/file/25303568572.pdfIn PDF document text
- http://officinedesign.it/userfiles/files/bimavozupadezezekidi.pdfIn PDF document text
- http://thecuriosityshot.com/rafuzupuwobovafobin.pdfIn PDF document text
- http://dakov.hu/_user/file/11756588022.pdfIn PDF document text
- https://nguoixunghekiev.vn/userfiles/file/24145211051.pdfIn PDF document text
- http://onestep-tokyo.com/userfiles/file/53939617562.pdfIn PDF document text
- http://didongsinhvien.com/upload/files/vipikevutogaliz.pdfIn PDF document text
- http://nuovojob.com/userfiles/files/96352196738.pdfIn PDF document text
- http://ttc-investco.com/img/files/gomarowulozopavaf.pdfIn PDF document text
- http://www.mbk-montage.nl/ckfinder/userfiles/files/zasulovexusikatirulosawim.pdfIn PDF document text
- http://fcraregistration.com/UploadedData/file/64086598600.pdfIn PDF document text
- http://szm.hu/userfiles/file/welajivevomajenim.pdfIn PDF document text
- http://bukharaalpharetta.com/sites/default/files/file/rugezuxovosopuzafukijoku.pdfIn PDF document text
- http://oa30us.com/userfiles/file/gipazut.pdfIn PDF document text
- https://sskundal.com/userfiles/file/pisoxov.pdfIn PDF document text
- http://vevo.keresztessyoptika.hu/elemek/file/bumukerotifigidofige.pdfIn PDF document text
- http://anhuizhkj.com/upload_fck/file/2021-10-4/20211004114611898485.pdfIn PDF document text
- http://newabel.com/ckfinder/userfiles/files/29704856385.pdfIn PDF document text
- http://atletika-pardubice.cz/files/file/zesoborudusiwadamobide.pdfIn PDF document text
- https://zaindu.drogomedia.com/files/galeria/files/rarujizifasazo.pdfIn PDF document text
- http://kleinschadenexperte.com/userfiles/file/fubideperevoperasebezofid.pdfIn PDF document text
- http://maasmartcity.com/userfiles/file/zokasetitosogosuwizaduti.pdfIn PDF document text
- https://empezo.xyz/js/ckfinder/userfiles/files/93680505389.pdfIn PDF document text
- http://beergolfers.com/blog/images/file/vapifutozebopapotomap.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_off0000cb1d.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xCB1D	17780 bytes
SHA-256: `bc2b9711694aa03e13fe6f77a6a124533eaa40c8175683d0d329e10f8257c90f`
`font_01_sfnt_off0000f8f7.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xF8F7	10868 bytes
SHA-256: `b64b2cd39b2f674b074466f116f46269962d4e64762f84fae4d667e9e261a810`
`font_02_sfnt_off00011261.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x11261	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`

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