PDF malware analysis — malicious · 093c0433cdd9ec3f

MALICIOUS

PDF

81.7 KB Created: 2021-10-18 07:45:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25

MD5: 6de136235c52673a60eadf8e757d788d SHA-1: 5547d8e78769d6ddad92a00f59b3baed21eda0e3 SHA-256: 093c0433cdd9ec3f32509c39f9751d9d16e8588be5be7ebf660328cdbb71fec5

134 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, indicating an attempt to execute malicious code. It also features a high number of external URIs pointing to a link farm hosted on disposable domains, a common tactic for SEO poisoning or malware distribution. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or 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 http://lnyuanzong.com/uploads/files/20210911090939.pdf In PDF document text
- http://coiffurenais.com/userfiles/file/vurejofuzaxogedolikopog.pdfIn PDF document text
- https://cursosadistanciayonline.com/medios/files/17239399198.pdfIn PDF document text
- http://qkmedica.com/uploads/userfiles/file/38088603181.pdfIn PDF document text
- https://1000families.eu/userfiles/file/sujodudafiwuzagafif.pdfIn PDF document text
- http://gardens-spa.com/user_pict/file/779553466.pdfIn PDF document text
- https://oldgradeducation.com/ckfinder/userfiles/files/96615499362.pdfIn PDF document text
- https://mytshirtcreator.com/app/webroot/files/file/60569773931.pdfIn PDF document text
- http://www.logomarcanet.com/userfiles/file/42063622889.pdfIn PDF document text
- http://saluteebenesseresas.it/userfiles/files/lojiwovalekedufe.pdfIn PDF document text
- https://www.whoamiandwhyamihere.com/ckfinder/userfiles/files/vudosonik.pdfIn PDF document text
- http://z500.si/files/13947301972.pdfIn PDF document text
- http://www.performhabitat.fr/bundles/astadmin/js/ckfinder/userfiles/files/25357986570.pdfIn PDF document text
- http://myepres.com/HotelEstimator/userfiles/file/rudufapedum.pdfIn PDF document text
- http://thaimassageboy.com/ckfinder/userfiles/files/48596815683.pdfIn PDF document text
- https://chptravel.ir/data/file/fowomefejexoponigisixa.pdfIn PDF document text
- http://wlpp.net/images/blog/file/desisevakofunagi.pdfIn PDF document text
- http://altelaw.com/uploads/image/file/50164534247.pdfIn PDF document text
- http://www.schule.havonix.com/ckfinder/userfiles/files/83026390319.pdfIn PDF document text
- https://gionggiacam.com/ckfinder/userfiles/files/fafamugevebebe.pdfIn PDF document text
- http://moveisgarciadigital.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1616ca0b1ae3b2---pikidotasafunajetojirino.pdfIn PDF document text
- http://anshan56.cn/userfiles/file/1633385254920950534.pdfIn PDF document text
- http://panda-es.tokyo/yamituki-n/uploads/files/pivoxuvotedomes.pdfIn PDF document text
- http://aloisiquadri.it/userfiles/files/22078801609.pdfIn PDF document text
- https://feedproxy.google.com/~r/Gsjc/~3/2I9n2o-U8HI/uplcv?utm_term=spider+with+yellow+bands+on+legsPDF 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_off0000d84b.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xD84B	18664 bytes
SHA-256: `b96368d960ebef97c6c263011d6e95771598d964be45dcca9aa01f00a5576a3a`
`font_01_sfnt_off00010795.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x10795	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_02_sfnt_off00011fac.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x11FAC	11084 bytes
SHA-256: `782d08938ba870dc572fe1d14e4af8c6b955a914d90a7c45dd569d19f3e279bf`

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