PDF malware analysis — malicious · 7e28316f24d77184

MALICIOUS

PDF

114.4 KB Created: 2021-09-14 02:09:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23

MD5: 4749c03340a663d68f7147d983d1f9de SHA-1: 3969d16fcdafe77977c581838ad5a1e6493bbd54 SHA-256: 7e28316f24d77184a47d861840b4e1de868619b2a1f3947e5891cf1d08d73082

134 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains embedded JavaScript and multiple external URIs, indicating it is designed to redirect users to malicious sites. The 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic strongly suggests a phishing or malware distribution scheme, with numerous links pointing to disposable hosting. The ML classifier and ClamAV detection further confirm the malicious nature of the file.

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 https://philabc.ru/uplcv?utm_term=ww2+soviet+army+ranks PDF link annotation
- http://suachuamaydemtien.biz/userfiles/file/78446111849.pdfIn PDF document text
- http://moscreen.in/cmsfiles/file/mulavoduzozi.pdfIn PDF document text
- http://hoachattn.com/image/files/74023053552.pdfIn PDF document text
- https://sahyadrisevasanstha.in/userfiles/file/47157645934.pdfIn PDF document text
- http://paillasse.hu/userfiles/file/34717556642.pdfIn PDF document text
- http://webinaris.org/ckfinder/userfiles/publics/files/72221672215.pdfIn PDF document text
- https://editora-arara-azul.com.br/site/admin/ckfinder/userfiles/files/mogalotafojixo.pdfIn PDF document text
- http://demo-jesma.shopcloud.es/ckfinder/userfiles/files/makavusagadipenano.pdfIn PDF document text
- http://nfc.soo.jp/file/gudewuxuwerigage.pdfIn PDF document text
- https://davidfoleyinc.com/userfiles/file/67414676872.pdfIn PDF document text
- https://www.serwkom.pl/plugins/ckfinder/userfiles/files/zinozov.pdfIn PDF document text
- http://solartgaleria.hu/images/file/tunarorese.pdfIn PDF document text
- https://manajrgvaaradhi.com/cms-uploads/files/50589751473.pdfIn PDF document text
- http://xn--or3bo5mvlb.com/data/editor/file/22016725337.pdfIn PDF document text
- http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16131b72802412---8970824909.pdfIn PDF document text
- https://paklya.su/design/img/upload/file/kilusenarog.pdfIn PDF document text
- http://placidlakes.com/larpm/uploads/file/14430300571.pdfIn PDF document text
- http://zhizhencn.com/filespath/files/20210907214819.pdfIn PDF document text
- https://trieurodata.ro/images/file/46606089159.pdfIn PDF document text
- http://sandsflooring.co.uk/ckfinder/userfiles/files/jajolabekeribulo.pdfIn PDF document text
- http://csc0512.com/userfiles/file/20210907225101_6hljw3.pdfIn PDF document text
- https://malabarmail.com/ckfinder/userfiles/files/15309202623.pdfIn PDF document text
- https://immo-cjeanpaul.lu/userfiles/files/40704631002.pdfIn PDF document text
- http://sjmhospital.org/files/js/ckfinder/userfiles/files/rimitegosixulovexa.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_off00015940.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x15940	19188 bytes
SHA-256: `23642b0cb4f2ea94fa243e820b8cce9afa2ff5f8135b1c333ca52a7cb4a745db`
`font_01_sfnt_off00018ad7.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x18AD7	10692 bytes
SHA-256: `b16ff2e69b703dd934fb8ed5b115df4387472c99dee0e12aa631520fa5978c52`
`font_02_sfnt_off0001a38e.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x1A38E	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`

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