PDF malware analysis — malicious · 38299c29d6067be0

MALICIOUS

PDF

74.0 KB Created: 2021-09-09 00:53:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11

MD5: f45ccbb1a7befca9c9bd4aa1e4682173 SHA-1: f29d7b86b3d2eb9c06fc1741341d80ef98a9d7f0 SHA-256: 38299c29d6067be04958de908ab48dea3b8675a60a392236e399c499dfc9907a

134 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a large number of external URIs, many of which are hosted on disposable domains. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly suggests a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection confirm the malicious nature of the file, likely for phishing or malware distribution.

Machine Learning

Nyx PDF Classifier malicious score 0.9947

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://synerhu.ru/uplcv?utm_term=glu+coins+hack+apk PDF link annotation
- https://stw-nowogard.pl/download/file/39539894270.pdfIn PDF document text
- http://sm.ac.th/ckfinder/userfiles/files/16772631383.pdfIn PDF document text
- http://anhbanglaw.com/userfiles/file/xakokepido.pdfIn PDF document text
- http://floramarble.com/uploads/17688089769.pdfIn PDF document text
- http://kuwaited.com/cote_dor_import/admin/ckfinder/userfiles/files/4231090603.pdfIn PDF document text
- http://sibzakon.ru/ckfinder/userfiles/files/bobumumigutikozorozalamap.pdfIn PDF document text
- https://mebelihome.ru/upload_picture/bosuworita.pdfIn PDF document text
- http://architettoseneca.com/userfiles/files/37456168450.pdfIn PDF document text
- http://recit-de-vie.fr/userfiles/file/97387021763.pdfIn PDF document text
- https://pirkitpadangas.lt/ckfinder/userfiles/files/kamobelaniredufaw.pdfIn PDF document text
- http://760_709737661.mildmedia-dev.eu/uploads/userfiles/files/xexotekexovaduxerorilepe.pdfIn PDF document text
- https://postelezmasivu-praha.cz/ckfinder/userfiles/files/10663138528.pdfIn PDF document text
- http://ozkayalartrans.com/userfiles/file/kivobozelu.pdfIn PDF document text
- https://www.adcgrain.com/wp-content/plugins/super-forms/uploads/php/files/009144ca88feb86a8686851cbb9d5647/9256231328.pdfIn PDF document text
- http://0-50.ru/userfiles/file/barelomapevawux.pdfIn PDF document text
- https://www.sophrologue-nimes.fr/upload/news/files/vobilivizovolev.pdfIn PDF document text
- http://giasuthienphuc.com/Images_upload/files/875998986.pdfIn PDF document text
- http://barrybusiness-crm.com/ressource/devis-photo/files/16970071792.pdfIn PDF document text
- http://donghobaoan.com/uploads/files/40047938130.pdfIn PDF document text
- http://kurumakaitori-one.com/js/upload/files/ginasibowizuzevuberujefuk.pdfIn PDF document text
- https://toscanafantastica.com/userfiles/file/lagobekazinu.pdfIn PDF document text
- http://cn-daomeng.com/upload/userfiles/files/13fe5d63e0fbaf19c56080c6cda6b1ef.pdfIn PDF document text
- https://visionbrindes.com/admin/fckeditor/userfiles/file/velebipuzajevub.pdfIn PDF document text
- http://moscreen.in/cmsfiles/file/kuwivezomod.pdfIn PDF document text
- https://kurashi-kyoiku.com/cms/dat/upimg/file/bufevatoriro.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_off0000bcda.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xBCDA	17968 bytes
SHA-256: `76447f66af1163554a2689f595ed21ed4ac33264ad851bada05c94c4457b3e0b`
`font_01_sfnt_off0000eb90.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xEB90	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_02_sfnt_off000103a7.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x103A7	10372 bytes
SHA-256: `0bf59c122fd49404c94ec9bdb2c1aeff002a6b26562a2ec969be765a298afedb`

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