PDF malware analysis — malicious · e88666fb55511e41

MALICIOUS

PDF

81.3 KB Created: 2021-02-23 23:56:18 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-07

MD5: 9de4c102742752fcde8866f42549fa88 SHA-1: bd65a7609ca75bc68f05e0ffe9470f20a09773bf SHA-256: e88666fb55511e410104cfe92efcce7e4157c2d9bd28be603797848869a34d1f

126 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF document contains multiple embedded URLs, with a primary one pointing to 'druttle.ru'. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a pattern of using disposable hosting for link farms, suggesting a phishing or malware distribution scheme. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or delivering a secondary payload via the embedded links.

Machine Learning

Nyx PDF Classifier malicious score 0.9996

Heuristics 5

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.
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://druttle.ru/strik?utm_term=percy+jackson+remake+cast+2020 PDF link annotation
- https://cdn-cms.f-static.net/uploads/4412899/normal_5fd5f08890c36.pdfIn PDF document text
- https://static.s123-cdn-static.com/uploads/4394061/normal_6004c1de206c8.pdfIn PDF document text
- https://cdn.sqhk.co/xovujiroveg/zOZha2A/best_2020_tv_deals.pdfIn PDF document text
- https://xazepobuzu.weebly.com/uploads/1/3/4/5/134582826/3163304.pdfIn PDF document text
- https://sonanibiforopo.weebly.com/uploads/1/3/2/7/132710732/sogimabilo.pdfIn PDF document text
- https://bozaxadoduzake.weebly.com/uploads/1/3/4/3/134306622/kabutinuma-rebugu-xutikefaru-lageti.pdfIn PDF document text
- https://marizezibafive.weebly.com/uploads/1/3/4/8/134865590/xowaga.pdfIn PDF document text
- https://xevekefipozi.weebly.com/uploads/1/3/1/4/131406281/0417292b.pdfIn PDF document text
- https://cdn.sqhk.co/ninujamezol/jfsiigi/oxygen_sensor_bank_1_sensor_2_price.pdfIn PDF document text
- https://cdn-cms.f-static.net/uploads/4476766/normal_601e22d8e2968.pdfIn PDF document text
- https://rinapaluvubozi.weebly.com/uploads/1/3/4/6/134669605/balato_pudesov.pdfIn PDF document text
- https://static.s123-cdn-static.com/uploads/4419001/normal_5fdeee9405427.pdfIn PDF document text
- https://cdn.sqhk.co/lofujumixas/dhengcn/anime_wallpaper_iphone_7.pdfIn PDF document text
- http://narosisebono.22web.org/cinetica_de_crecimiento_bacteriano.pdfIn PDF document text
- https://bawusazatodopam.weebly.com/uploads/1/3/1/3/131378774/dcd48950b.pdfIn PDF document text
- https://cdn-cms.f-static.net/uploads/4370561/normal_6016a8256d315.pdfIn PDF document text
- https://cdn-cms.f-static.net/uploads/4426062/normal_601f912c36666.pdfIn PDF document text
- https://cdn.sqhk.co/tibakekavero/habrege/76293889289.pdfIn PDF document text
- http://www.ascendercorp.com/In PDF document text
- http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
- http://makowadoka.epizy.com/think_public_relations_2nd_edition.pdfIn PDF document text
- http://zoribele.epizy.com/41800850435.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
- https://savannah.gnu.org/projects/freefont/In PDF document text
- http://www.gnu.org/licenses/In PDF document text
- http://www.gnu.org/copyleft/gpl.htmlIn PDF document text
- http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`font_00_sfnt_off0000e5cc.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xE5CC	6588 bytes
SHA-256: `b3260a8b27c40a1c9408c40b3dcfb9ec9ded560232013cbc1ca8de37ebb5a831`
`font_01_sfnt_off0000f615.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xF615	2940 bytes
SHA-256: `5abd1102bbb49cd9fee3e8c7db4f4b96944035d8cd52b1c4794f50b825db5b40`
`font_02_sfnt_off000100a1.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x100A1	5432 bytes
SHA-256: `d574c881ab97838468ca0c7ac62f4d494da8eaeecaed8269896cfcc09e26c90a`
`font_03_sfnt_off00011314.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x11314	10612 bytes
SHA-256: `0a3a6eb27c999386851a348bd8a534162c791a02942cdd56ccbab620c19f1527`

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