PDF malware analysis — malicious · 38aef0d822db9a17

MALICIOUS

PDF

70.7 KB Created: 2021-10-04 04:09:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25

MD5: f99e5c20e1ed6111977d4be867e624ad SHA-1: fda9200a032a36e79c722824dd6698f63b90b4da SHA-256: 38aef0d822db9a17056c23130fbf4c13c06342507bfacb29dcd727e5304a5aa7

134 Risk Score

Malware Insights

MITRE ATT&CK

T1059.007 JavaScript T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains embedded JavaScript which is flagged as malicious by ML classifiers and ClamAV. This script likely redirects the user to external URLs, such as the identified 'pistant.ru' domain, which is characteristic of phishing or malware distribution campaigns. The document's structure and numerous external links to disposable hosting also suggest it functions as a link farm for malicious content.

Machine Learning

Nyx PDF Classifier malicious score 0.9978

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://pistant.ru/uplcv?utm_term=a+comprehensive+guide+to+yellow+stripey+things PDF link annotation
- https://ashasuchikala.com/ckfinder/userfiles/files/ruvebigu.pdfIn PDF document text
- https://www.leasing.net.in/ckfinder/userfiles/files/70322775342.pdfIn PDF document text
- https://postelezmasivu-liberec.cz/ckfinder/userfiles/files/gizaxipa.pdfIn PDF document text
- http://summitremodelinginc.com/userfiles/files/481793958.pdfIn PDF document text
- http://teranor.com/ckfinder/userfiles/files/xetulevevuji.pdfIn PDF document text
- http://around-sicily.net/userfiles/file/77285279599.pdfIn PDF document text
- https://aftaplan.com/works/peepsparty/html/upload_files/file/42970707855.pdfIn PDF document text
- https://gulfsupremesa.com/ckfinder/userfiles/files/bomizupolizetonutowiwiv.pdfIn PDF document text
- https://toliveinchristjesus.ceosale.catholic.edu.au/application/third_party/ckfinder/userfiles/files/11678726801.pdfIn PDF document text
- http://verduciautodemolizioni.it/userfiles/file/nulaxajowefodosakosuwa.pdfIn PDF document text
- http://rama-sp.com/rama/webroot/js/ckfinder/userfiles/files/gorewulazaxif.pdfIn PDF document text
- http://newabel.com/ckfinder/userfiles/files/10135820957.pdfIn PDF document text
- http://ziva-muzika.cz/files/file/51409705465.pdfIn PDF document text
- https://www.marjojaspers.nl/ckfinder/userfiles/files/papejozudavola.pdfIn PDF document text
- https://confetti-seasons.ru/upload/files/pimefi.pdfIn PDF document text
- http://skncn.com/u/files/xutofokibirimiwenog.pdfIn PDF document text
- https://xn--80aaijzh9b.xn--90ae/documents/file/81663943639.pdfIn PDF document text
- https://mcq-exambd.com/app/webroot/ckfinder/userfiles/files/73610882834.pdfIn PDF document text
- http://www.dawnrotaryclub.tw/UserFiles/files/40375237948.pdfIn PDF document text
- https://0a3exp.com/upfiles/editor/files/25607070745.pdfIn PDF document text
- http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614dcf9aec913---kuvesazekes.pdfIn PDF document text
- https://consultemergingmarkets.cubsindia.com/files/jonazuzewujazawekume.pdfIn PDF document text
- http://colantuono.it/userfiles/files/30266724884.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_off0000b1bb.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xB1BB	11144 bytes
SHA-256: `1607f6fca30108765d1b67b53dddcff1c9f5f4383bcf5861a333d80fc5695c35`
`font_01_sfnt_off0000cb73.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xCB73	16316 bytes
SHA-256: `39ff544077754ba47c6de55b62aaf19bd6cd7845fb32726667ec76c5c444d8c4`
`font_02_sfnt_off0000f4ec.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xF4EC	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`

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