PDF malware analysis — malicious · 5c9205092d848968

MALICIOUS

PDF

79.4 KB Created: 2021-09-17 01:56:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16

MD5: b09ab57d84cdf118cb4885bc39d40ed0 SHA-1: 709ef2c36de669be75d3e6cc0635ecc13e3168af SHA-256: 5c9205092d84896875ae079c37499c1b504235b3b9a391bdf70f15936c5ebf65

134 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

The sample is a PDF file detected as malicious by ClamAV and an ML classifier. It contains embedded JavaScript and a large number of external URIs, many of which are hosted on disposable domains. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic indicates a link farm strategy, suggesting the primary purpose is to redirect users to potentially malicious content or phishing sites. The embedded JavaScript likely facilitates this redirection or further malicious activity.

Machine Learning

Nyx PDF Classifier malicious score 0.9960

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=sultan+tamil+movie+watch+online PDF link annotation
- https://www.urban-quartz.co.uk/wp-content/plugins/super-forms/uploads/php/files/d5f62c5d0cd9a463fd9ed33e8031ee08/lelajejeguvefusitaro.pdfIn PDF document text
- http://lycee-elm.com/userfiles/file/wefak.pdfIn PDF document text
- http://dermatologomiguelgallego.com/miguel/fck/file/tejamunukiloxo.pdfIn PDF document text
- http://canvangdientu.com/images/file/38844778031.pdfIn PDF document text
- http://relaxzenter.com/uploads/files/pataxagenemegipiregipiro.pdfIn PDF document text
- http://yjbiotech.cn/upload/files/1732836521.pdfIn PDF document text
- https://china-glass-mosaic.com/userfiles/files/20210907_064440.pdfIn PDF document text
- http://mercuresamuichaweng.com/admin/file/tovowagojaxovizojizugu.pdfIn PDF document text
- http://mecateengenharia.com.br/ckfinder/userfiles/files/wapalajakuleliwele.pdfIn PDF document text
- http://gtlmarinefuel.com/userfiles/file/pezokiw.pdfIn PDF document text
- https://kingwrapcarspa.com/upload/files/govovuduxuk.pdfIn PDF document text
- http://mai-colle.jp/userfiles/file/81097883654.pdfIn PDF document text
- http://ijfbn.com/editor_up/33084271060.pdfIn PDF document text
- https://leicht-spb.ru/wp-content/plugins/super-forms/uploads/php/files/5d0757070961071de00b427448593cfd/12520819638.pdfIn PDF document text
- http://gshosnab.ru/userfiles/file/xafibaxabilufetuke.pdfIn PDF document text
- http://iseveranscopy.com/upload/editor/file/sowixakosalifofewixife.pdfIn PDF document text
- http://www.palmettoexpresslanes.com/system/js/back/ckfinder/userfiles/files/51458225293.pdfIn PDF document text
- http://ettermanenterprises.com/ckfinder/userfiles/files/leguvolef.pdfIn PDF document text
- https://firsatpin.com/calisma2/files/uploads/52875253320.pdfIn PDF document text
- https://vadihosting.com/calisma2/files/uploads/29059844334.pdfIn PDF document text
- https://cs168.tw/upfiles/editor/files/69570239220.pdfIn PDF document text
- http://megalabsrl.it/userfiles/files/sujotonofin.pdfIn PDF document text
- http://baocaosudanang24h.com/uploads/image/files/95378215857.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_off0000d118.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xD118	10556 bytes
SHA-256: `daa3480a919dce0751fd18d7c8b3efed6ba1d5b3341e5e28e5c8df26b528a3ab`
`font_01_sfnt_off0000e901.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xE901	18196 bytes
SHA-256: `8915573101daef8c01a5d2a3e9afa8147978d690c7b0884cb1b285ee2e276ef5`
`font_02_sfnt_off00011814.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x11814	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`

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