PDF malware analysis — malicious · d3bdbcb3da38184b

MALICIOUS

PDF

70.3 KB Created: 2021-09-30 19:11:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25

MD5: a1768ea8c134e47446b0db7504d833a2 SHA-1: e48c0a04d19c0c0feadc6e6f1db87b2b98163f32 SHA-256: d3bdbcb3da38184bba7a07a170ee8f871eebe229960d83ec821295742cd6bb64

134 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains embedded JavaScript and a high number of external URIs, many of which point to disposable domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to redirect users to phishing sites or download further payloads. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' specifically highlights the tactic of using numerous links on disposable hosting, suggesting a phishing or spam campaign.

Machine Learning

Nyx PDF Classifier malicious score 0.9982

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://philabc.ru/uplcv?utm_term=rrb+general+knowledge+questions+and+answers+pdf PDF link annotation
- http://cmtoolsrental.com/user_img/files/zukafigewi.pdfIn PDF document text
- http://mirai-kankyo.com/userfiles/files/wazobizimakakugisuraguf.pdfIn PDF document text
- http://fazekaskozpont.hu/images/upload/file/ratepokivafisufojo.pdfIn PDF document text
- http://pferdefreunde-brueckenhof.de/sites/default/files/userfiles/file/8614286491.pdfIn PDF document text
- http://imobiliariaimperio.com/files/files/tovolezexabevasobilug.pdfIn PDF document text
- https://www.hotel-restaurant-plainfaing.fr/ckfinder/userfiles/files/fibusimigujijajatebovobu.pdfIn PDF document text
- https://suny.cz/files/file/46924244718.pdfIn PDF document text
- https://hobbypet.cz/files/file/rewamagefewi.pdfIn PDF document text
- http://bburago.info/admin/fckeditor/userfiles/file/luzetalelixite.pdfIn PDF document text
- http://headrepublic.pl/images/files/tavobotewujuw.pdfIn PDF document text
- http://ayurveda-shiatsu-nice.com/upload/files/37422960691.pdfIn PDF document text
- https://thomsonindia.com/userfiles/files/fuwubopune.pdfIn PDF document text
- https://www.bouwenaaneensterkwerkgeversmerk.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1615598fcece23---2860368953.pdfIn PDF document text
- https://himalayanwanderer.com/himalayan/userfiles/files/mabutapufedixi.pdfIn PDF document text
- http://protok.pro/upload/files/vosetubimidiweloget.pdfIn PDF document text
- http://paykaaluminiya.ru/ckfinder/userfiles/files/wokibuxebojal.pdfIn PDF document text
- http://www.thebetterinsurance.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614dffea824b9---fuparodilirubigawine.pdfIn PDF document text
- http://lj-group.cn/upload/files/68801069260.pdfIn PDF document text
- https://www.dogandemir.av.tr/paketler/ckfinder/dosyalar/files/wowukoru.pdfIn PDF document text
- https://www.frontiermyanmar.com/sites/all/libraries/ckfinder/userfiles/files/50991376872.pdfIn PDF document text
- http://tridiart.cl/ckfinder/userfiles/files/rolefugavuweponelafopilig.pdfIn PDF document text
- https://minervatech.work/js/ckfinder/userfiles/files/mubawutugebirojanifesike.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_off0000b10e.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xB10E	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_01_sfnt_off0000c920.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xC920	15796 bytes
SHA-256: `1011da76cb175d449f921012706ca3395bac65dbdde1701f1e2d06fd36059979`
`font_02_sfnt_off0000f13c.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xF13C	11280 bytes
SHA-256: `cea18d016e9e81e48704424a4e8822b603a7a397061780c997510782b77d57e8`

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