PDF malware analysis — malicious · 1d62f074cd526667

MALICIOUS

PDF

88.5 KB Created: 2021-09-10 11:54:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27

MD5: 0fccb872b881340a639b7944a5209838 SHA-1: aa550628a1819f722615a68ae0adbccab5548def SHA-256: 1d62f074cd52666734fb1e7675afe509732a6c1166a21ee2dd21202a3b020903

134 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

The sample is a PDF containing embedded JavaScript, which is a common technique for exploiting PDF vulnerabilities or delivering malicious content. The PDF also contains numerous external URIs, many of which point to potentially disposable hosting, suggesting a link farm or phishing lure. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or trojan delivery.

Machine Learning

Nyx PDF Classifier malicious score 0.9973

Heuristics 6

ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
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://massimomoroni.it/userfiles/files/wakukigibuwiroxudop.pdf In PDF document text
- http://wuxihemei.com/ckfinder/userfiles/files/20210904_180412.pdfIn PDF document text
- http://reklamavysocina.cz/UserFiles/File/43341853082.pdfIn PDF document text
- http://xn--80aaeiengkwpz6p.xn--p1ai/pub/file/37683856091.pdfIn PDF document text
- http://hrzservices.com/uploadfiles/file/67109424994.pdfIn PDF document text
- https://vegastel.eu/components/com_mijoshop/opencart/image/data/files/75436684963.pdfIn PDF document text
- http://studiomarcheluzzo.it/userfiles/files/29992352681.pdfIn PDF document text
- https://atputasbaze.lv/images/userfiles/files/luxegunurosa.pdfIn PDF document text
- https://www.sacproblemleri.com/wp-content/plugins/formcraft/file-upload/server/content/files/161322f3c4530f---negizumamameruwudixadom.pdfIn PDF document text
- http://www.nstoplana.rs/ckfinder/userfiles/files/39264787021.pdfIn PDF document text
- http://hoteldazegliotorino.com/userfiles/files/kudamamekilubufe.pdfIn PDF document text
- https://assurancemauricie.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132550bc526e---vazosigifu.pdfIn PDF document text
- http://sasmedm.com/www/js/ckfinder/userfiles/files/93006176093.pdfIn PDF document text
- http://maschimaurizio.it/userfiles/files/wotelojikubugorimesise.pdfIn PDF document text
- https://idealist.ro/userfiles/file/94127859962.pdfIn PDF document text
- https://hssanesteban.cl/files/98791809701.pdfIn PDF document text
- http://patp1ryb.ru/media/file/dowobojokaloni.pdfIn PDF document text
- http://cokhixnktientien.com/Images_upload/files/sawuwinirowutivelexoz.pdfIn PDF document text
- https://xtrafitcoaching.com/www/images/files/89231982459.pdfIn PDF document text
- http://qianxish.com/ckfind_image/files/81504494335.pdfIn PDF document text
- http://gazomotor.com/allinone/file/dizubexegufi.pdfIn PDF document text
- https://flexi-cms.com/uploads/file/13851258030.pdfIn PDF document text
- https://cs-nippon-cp.com/mailmagazine/upload/files/61358085042.pdfIn PDF document text
- http://sswjeans.com/files/83196497937.pdfIn PDF document text
- https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=horizontal+balance+in+artPDF 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_off0000f94e.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xF94E	17024 bytes
SHA-256: `9ac30169e70fa8d97e55cbc295d1b2d273298c662e57330450cd83ef52eea85b`
`font_01_sfnt_off00012544.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x12544	10248 bytes
SHA-256: `d04da2534470ccf36d720cc69c5b649ed72ef0c59c4e18cdc3cd632be108cf83`
`font_02_sfnt_off00013c63.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x13C63	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`

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