PDF malware analysis — malicious · ffb1a879515b3550

MALICIOUS

PDF

76.4 KB Created: 2021-09-10 13:22:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14

MD5: 94a66124a9e6e7a41cd0e4b816c87403 SHA-1: 69c9112e2d4bbe881cfde2ba10bc535235e02675 SHA-256: ffb1a879515b35508c249067c9dd2f889e1d4a32cf4d7954b9bd4a54685f09b1

134 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains embedded JavaScript and numerous external URIs, many of which are hosted on disposable domains and appear to be part of a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution. The embedded JavaScript and external links suggest an attempt to redirect the user to a malicious site or download a secondary payload.

Machine Learning

Nyx PDF Classifier malicious score 0.9943

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://inwebjor.ru/uplcv?utm_term=download+gta+v+for+android+and+ios PDF link annotation
- https://fallsplat.se/bildbank/file/xawiluzupetupilesunuked.pdfIn PDF document text
- https://infiniteprospects.com/FCKeditor/file/39397081802.pdfIn PDF document text
- https://digireg.ru/upload/wesibosonaxigaxosol.pdfIn PDF document text
- http://www.opencalgary.org/wp-content/plugins/formcraft/file-upload/server/content/files/1613484f11cc88---pegivap.pdfIn PDF document text
- http://montaze.org/democms/userfiles/file/91148326664.pdfIn PDF document text
- http://emailreceptionist.net/userfiles/file/87848685356.pdfIn PDF document text
- http://bhttourist.com/upload/fckimagesfile/11439353558.pdfIn PDF document text
- http://opusincertum.it/userfiles/files/97974457167.pdfIn PDF document text
- http://dpholding.ru/uploads/files/bixuzaf.pdfIn PDF document text
- https://dobski.pl/userfiles/file/tironirugezeriji.pdfIn PDF document text
- http://vaynhe.com/upload/files/sukil.pdfIn PDF document text
- https://hantverksakuten.se/ckfinder/userfiles/files/8567651972.pdfIn PDF document text
- http://asremajazi.com/uploads/files/loruratonoxolaxegezip.pdfIn PDF document text
- https://frasertechno.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139b36c89651---86169376416.pdfIn PDF document text
- https://wcfkenzi.com/ckfinder/userfiles/files/geladiterixedelowor.pdfIn PDF document text
- http://cjpharmtech.com/upload/files/45659156819.pdfIn PDF document text
- http://anhuishangbiao.com/upload_fck/file/2021-9-1/20210901213604541841.pdfIn PDF document text
- http://asclyziarskyklub.sk/userfiles/file/nagapetub.pdfIn PDF document text
- https://zmiz.hr/userfiles/file/jadamepi.pdfIn PDF document text
- http://wolfroccatiassociati.it/userfiles/files/61802830744.pdfIn PDF document text
- http://alda.pl/ckfinder/userfiles/files/75142532350.pdfIn PDF document text
- http://www.leads-bd.org/app/webroot/js/ckfinder/userfiles/files/devakuzas.pdfIn PDF document text
- https://taiwan-tiaya.com/upload/tiaya_official/files/12362428592.pdfIn PDF document text
- https://zenithservicos.com/userfiles/files/67213126224.pdfIn PDF document text
- http://lltsg.com/uploadfile/file///2021090715590119.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_off0000c5b8.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xC5B8	10552 bytes
SHA-256: `09af27ee43ed1845353599479db32228cf67fe3f1ade9e905acd26bf09c471c9`
`font_01_sfnt_off0000ddb7.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xDDB7	17556 bytes
SHA-256: `177cf9010e7b94ae1572b818ebcf527aba1d89fcc3aa79d6612f5d7c6a54e710`
`font_02_sfnt_off00010b88.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x10B88	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`

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