PDF malware analysis — malicious · 9c36cee9cbb90160

MALICIOUS

PDF

93.8 KB Created: 2021-09-24 11:46:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25

MD5: ca777aaed98b8fe6cb3179e1bfa4616b SHA-1: 5968655d419a1b789f726bdcdd48aebd86cccfd8 SHA-256: 9c36cee9cbb90160acd41ef86c5827859e1c77c0b4fc1c1c2be29197a433f850

134 Risk Score

Malware Insights

MITRE ATT&CK

T1059.007 JavaScript T1566.001 Spearphishing Attachment

The sample was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains embedded JavaScript and numerous external URLs, many of which appear to be part of link farms or disposable hosting, suggesting an attempt to distribute or host malicious content. The presence of embedded JavaScript points towards an attempt to execute malicious code within the PDF.

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://philabc.ru/uplcv?utm_term=apk+stop+motion+studio PDF link annotation
- http://zkojicin.cz/userfiles/file/vaxibudepovugaruwuzamobo.pdfIn PDF document text
- http://winhazel.com/indigo/ckfinder/userfiles/files/8247392718.pdfIn PDF document text
- https://cortopolis.ar/userfiles/file/pisafukezawera.pdfIn PDF document text
- http://gojjang.com/uploads/files/99518448152.pdfIn PDF document text
- https://moyaexpresss.com/ckfinder/userfiles/files/69681623613.pdfIn PDF document text
- https://mailing.crpm.ch/ck/ckfinder/userfiles/files/sumiwibabuzowop.pdfIn PDF document text
- http://laiksmodalux.lt/app/webroot/uploads/userfiles/files/tunox.pdfIn PDF document text
- http://henca.com/files/details/file/46089968273.pdfIn PDF document text
- http://allgeology.ru/ckfinder/userfiles/files/taxutozisatowilunitejegi.pdfIn PDF document text
- https://linlinline.biz/js/ckfinder/userfiles/files/menugaxenovarakif.pdfIn PDF document text
- http://hanhthien.net/uploads/file/39270625228.pdfIn PDF document text
- https://rosebankprimary.co.za/inc/ckfinder/userfiles/files/83806979983.pdfIn PDF document text
- http://shanghaicruiseparty.com/uploads/file/zidedubijiwibuge.pdfIn PDF document text
- https://infotechloyalty.com/bot/ckfinder/uf/files/sefenepusedowedemu.pdfIn PDF document text
- http://www.eatvirukai.lt/uploads/files/xasufafurisaxorup.pdfIn PDF document text
- https://rpdev.org/ckfinder/userfiles/files/pikisuzomupavijeguz.pdfIn PDF document text
- https://dabanbep.tanglehadong.com/upload/files/92204678950.pdfIn PDF document text
- http://gestaocipa.com/public_html/Imagens/file/mufawapesovekunozalure.pdfIn PDF document text
- http://mackyz7automotive.com/js/upload/files/nobulefixafiz.pdfIn PDF document text
- http://unstitchedfootwear.net/files/file/4837901150.pdfIn PDF document text
- http://circuitvietnamcambodge.com/hinhanh/file/tigapuratusuroxomowil.pdfIn PDF document text
- http://bebsulmare.com/userfiles/files/4581790095.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 4

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`font_00_sfnt_off0000e42a.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xE42A	10284 bytes
SHA-256: `c70a50213994d46e34c6eac8b848295b75208740e0baaa445722018c6522534c`
`font_01_sfnt_off0000fb52.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xFB52	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_02_sfnt_off00011363.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x11363	16512 bytes
SHA-256: `f98163f07950eb6dab55c6a510249958461c6c1d733a8ed91ea08239a083991d`
`font_03_sfnt_off00012a75.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x12A75	25160 bytes
SHA-256: `16514bbb15884141985bdc75666c65e69831bc12787316564ac920e530d33f74`

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