PDF malware analysis — malicious · 3fa3407498414e18

MALICIOUS

PDF

77.8 KB Created: 2021-09-13 18:58:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26

MD5: 7448f8e9a6e1698f37f3704cc8d93156 SHA-1: b7cfc1a30744ddad07003c7a66c0f6c20ac966fb SHA-256: 3fa3407498414e18079e0d6926af105d182bf50cd9baad91a90ad0de511066aa

134 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, indicating malicious intent. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly suggests the document's purpose is to redirect users to a large number of potentially malicious sites. The ML classifier and ClamAV detection further confirm its malicious nature, likely as a phishing or malware distribution vector.

Machine Learning

Nyx PDF Classifier malicious score 0.9973

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://irlanc.ru/uplcv?utm_term=project+free+tv+series PDF link annotation
- https://dukupahit.com/contents/files/zexotikunoramez.pdfIn PDF document text
- http://originalcheck.it/public/img_admin/file///89877021247.pdfIn PDF document text
- http://mrhobbscoffee.com/images/uploads/file/60227521240.pdfIn PDF document text
- http://ahnil.com/userData/board/file/vijebalisesowov.pdfIn PDF document text
- http://lynxitservices.com/ckfinder/userfiles/files/85430281767.pdfIn PDF document text
- http://dgjinhak.kr/DATA/upload/files/202109070627185180.pdfIn PDF document text
- http://riskhedgetech.com/uploaded/file/5690046216138b7acd2031.pdfIn PDF document text
- https://12tiga.com/contents/files/82352850850.pdfIn PDF document text
- http://yaqeen-eg.com/userfiles/file/82789060244.pdfIn PDF document text
- http://uyaviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613462cd7bac2---99350609045.pdfIn PDF document text
- http://debandhelder.nl/ckfinder/userfiles/files/60826624891.pdfIn PDF document text
- http://perechen-izdaniy.ru/js/ckfinder/userfiles/files/fufenedutaganubekorenu.pdfIn PDF document text
- http://tuvanluatdanang.com/upload/ck/files/pibozevif.pdfIn PDF document text
- https://grandegroup.net/files/19034314206.pdfIn PDF document text
- https://cyberbirddog.com/userfiles/files/ramobinugukirerikap.pdfIn PDF document text
- https://warsztatgdynia.pl/app/webroot/media/files/94369359035.pdfIn PDF document text
- http://yjccnc.com/upload/files/ziwavejozarikoxevox.pdfIn PDF document text
- https://austdoorcaocap.com/upload/files/dejibuzedujugagibiroz.pdfIn PDF document text
- https://portugaliaimagyarok.com/ckfinder/userfiles/files/33554061993.pdfIn PDF document text
- http://hongphuc.vn/userfiles/file/jolutopelavulurelajuti.pdfIn PDF document text
- http://cosmosimpex.com/app/webroot/ckfinder/userfiles/files/9067158096.pdfIn PDF document text
- https://ita.kru.ac.th/ckfinder/userfiles/files/24843637823.pdfIn PDF document text
- http://polishingmarblefloor.it/userfiles/files/dinifazisudilujewadil.pdfIn PDF document text
- https://turismopontevedra.com/ckfinder/userfiles/files/sibaj.pdfIn PDF document text
- http://www.oneworldkarate.com/fckeditorimages/userfiles/file/7085972776.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_off0000cb2e.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xCB2E	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_01_sfnt_off0000e345.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xE345	10212 bytes
SHA-256: `78736c03028e6394a2a003518ef1e10eb50574bc959da5e4335865abeaa4f479`
`font_02_sfnt_off0000fa4e.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xFA4E	18000 bytes
SHA-256: `a3e0aa35c5d81d27c2e136c6b1aaf5739a87017b5c41ba58b029647eb6733d69`

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