PDF malware analysis — malicious · 45e140c7b43a355d

MALICIOUS

PDF

82.4 KB Created: 2021-09-09 11:04:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12

MD5: fa0c6f0124350624323bff24d9642019 SHA-1: 3c7aa6cbe6092f5f35722fa1f6eb2ec978105ab7 SHA-256: 45e140c7b43a355dfe6d1dee6b560f11a0ced54e4cd4f9a5464cac3ad5702da1

134 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The sample is a PDF document containing embedded JavaScript, which is a common technique for exploiting PDF vulnerabilities. The ML classifier and ClamAV detection strongly indicate malicious intent. The document body is heavily obfuscated, but the presence of numerous external URIs, including one pointing to `allytemp.ru`, suggests the primary goal is to redirect users to potentially malicious websites for phishing or further malware delivery.

Machine Learning

Nyx PDF Classifier malicious score 0.9955

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://allytemp.ru/uplcv?utm_term=vidmate+app+and+apk+download PDF link annotation
- http://cdn.eagle.mn/uploads/userfiles/files/66125133083.pdfIn PDF document text
- http://slstudio.it/userfiles/files/66499159873.pdfIn PDF document text
- https://jeneifogaszat.hu/cikkdata/files/25887076493.pdfIn PDF document text
- http://addisonplaza.abwingsmd.com/uploads/files/21771269392.pdfIn PDF document text
- https://implantsdentairesdesmoulins.com/upload/editor/file/56281747353.pdfIn PDF document text
- https://callmarkinvestments.com/callmark/files/45404353014.pdfIn PDF document text
- https://morganmethod.com/ci/userfiles/files/jadeguwavifenejakivinubo.pdfIn PDF document text
- http://fishtech.org/uploads/userfiles/file/file/rojofu.pdfIn PDF document text
- https://themodernla.com/wp-content/plugins/super-forms/uploads/php/files/ca6774e2b779867fa70a50f2466d7a03/90440594286.pdfIn PDF document text
- https://karpzbeldowa.pl/uploads/userfiles/files/lusetomeviwuxox.pdfIn PDF document text
- https://sipsib.ru/wp-content/plugins/super-forms/uploads/php/files/fc26489571002938865dc52b926a4344/bifatudugupizaginozin.pdfIn PDF document text
- https://lapalettedesarts.fr/gestion/file/81318512937.pdfIn PDF document text
- http://bolshunoff.ru/images/wysiwyg/file/653178934.pdfIn PDF document text
- http://thegrcinstitute.org/app/webroot/js/ckfinder/userfiles/files/81500923186.pdfIn PDF document text
- http://tbff-bygg.se/img/files/lozipix.pdfIn PDF document text
- https://easy2ticket.com/upload/files/jusarojigasifug.pdfIn PDF document text
- http://abwferrellpkwy.com/uploads/files/40227459402.pdfIn PDF document text
- http://hanstime.com/userData/board/file/25925005853.pdfIn PDF document text
- https://airbays.com/userfiles/file/30796304459.pdfIn PDF document text
- http://ghibms.com/userfiles/files/fapubibagusijipitutew.pdfIn PDF document text
- http://agisma.ru/files/pages/files/sukoboligog.pdfIn PDF document text
- http://imreelectric.sk/uploads/file/bekuduku.pdfIn PDF document text
- http://agro-partner.com/Image/files/jiviwisovuwevawatapazo.pdfIn PDF document text
- https://alves.bg/ckfinder/userfiles/files/858606391.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_off0000ddf2.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xDDF2	10432 bytes
SHA-256: `6e67b7755f24dcc29a245e1a7d20a44f0d61d16ea9e8b0c84293d6f4f9cb4854`
`font_01_sfnt_off0000f58e.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xF58E	17948 bytes
SHA-256: `b40ab98e83c6b1099ce85dd9f9810f07a63b546ec94dd5ac70ecc956532734d1`
`font_02_sfnt_off000123e8.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x123E8	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`

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