PDF malware analysis — malicious · 911d6a683b56f955

MALICIOUS

PDF

75.5 KB Created: 2021-09-24 10:47:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23

MD5: 611a5ad4d89d427b12550cf5703ec3d2 SHA-1: 0624b61fb16a3d3df96ab549b277e6de83206b43 SHA-256: 911d6a683b56f9552946ac64a1b7e8e2f8838bbc5b982c86c5b1878b61d3e231

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 heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly suggests a phishing or malware distribution scheme, with the sample acting as a lure for a game download. The ML classifier and ClamAV detection confirm the malicious nature of the PDF.

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://coretry.ru/uplcv?utm_term=gta+5+race+download PDF link annotation
- http://ymmicro.com/files/files/bopiwobilozuli.pdfIn PDF document text
- http://hurtowniagrafit.pl/userfiles/file/vuzadogigigala.pdfIn PDF document text
- http://storemisr.com/uploads/files/62899132496.pdfIn PDF document text
- http://www.vitrierbxl.be/wp-content/plugins/formcraft/file-upload/server/content/files/1614d12212a3d4---takavuse.pdfIn PDF document text
- http://ulv-fogger.ru/d/files/ropopuvese.pdfIn PDF document text
- https://noithathoaphat11.com/upload/files/pumolitujakemufux.pdfIn PDF document text
- http://gloteckr.com/upload/editor/file/4650558081.pdfIn PDF document text
- https://hglobaltourb2c.com/FileData/ckfinder/files/20210917_8ED4C683BF1C6460.pdfIn PDF document text
- http://cn-junsheng.com/upload/file///202191184665367.pdfIn PDF document text
- http://stromzeleny.cz/file/55946741265.pdfIn PDF document text
- https://www.webhisto.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16146fd8c38381---pumoxajawexudulukofinoxo.pdfIn PDF document text
- http://www.jasolasia.com/image/upload/File/xazilulakobaxam.pdfIn PDF document text
- http://fabriquetextil.com/js/new/fckeditor/userfiles/file/nugedudigufugirefepap.pdfIn PDF document text
- https://gruppopolidori.com/upload/image/file/72831471723.pdfIn PDF document text
- http://kawana.tech/userfiles/file/kevizigixituduturano.pdfIn PDF document text
- http://majedalkarkhi.com/pics/file/54483267089.pdfIn PDF document text
- http://klinok-saintp.ru/files/modaremukere.pdfIn PDF document text
- http://tk-weld.com/images/library/File/97898733896.pdfIn PDF document text
- http://medeeatour.ro/mm/file/veredolekotenisig.pdfIn PDF document text
- http://csp.hu/editor_up/90391381306.pdfIn PDF document text
- https://zilalcooling.com/other_files/File/52648885276.pdfIn PDF document text
- https://braintreeclinics.com/app/webroot/img/files/taguginawil.pdfIn PDF document text
- https://hoangvan.vn/wp-content/uploads/files/57048313759.pdfIn PDF document text
- http://kmjmt.com/news/upload/file/2109010719349052268wt0lb.pdfIn PDF document text
- http://dlshixiang.com.cn/ckfinder/userfiles/files/numuzelolabararutelez.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_off0000c501.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xC501	16744 bytes
SHA-256: `fb3464f56ba386331347484c0737729be896d7189dd4ef3d3a4698e21531b80d`
`font_01_sfnt_off0000f07c.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xF07C	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_02_sfnt_off00010893.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x10893	10364 bytes
SHA-256: `1e170927e8589e3beb01109df39d7dea6ab62d4d4fd6fdbe70deb679ca5a5d3e`

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