PDF malware analysis — malicious · 1c8e74667e10c1e5

MALICIOUS

PDF

86.3 KB Created: 2021-09-17 20:23:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24

MD5: e9f6e92a646352ec3742d30ed454b28c SHA-1: 82332e8058e01d435c365bec228872261f5c9c64 SHA-256: 1c8e74667e10c1e5ca9cf8ff60efbf608d324e0e63ad791575822ded2390b1ce

134 Risk Score

Malware Insights

MITRE ATT&CK

T1059.007 JavaScript T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, a common technique for executing malicious code within documents. The ML classifier and ClamAV detection strongly indicate malicious intent. The embedded JavaScript likely facilitates the redirection to external URLs, as suggested by the PDF_URI and PDF_SEO_DISPOSABLE_LINK_FARM heuristics, which are often used in phishing campaigns to lure victims to malicious sites.

Machine Learning

Nyx PDF Classifier malicious score 0.9974

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 http://plenaseguroseprevidencia.com/fotosempresa/files/tozemunumo.pdf In PDF document text
- https://www.restaurant-latableedevercel.com/ckfinder/userfiles/files/10617120609.pdfIn PDF document text
- http://termosystem.pl/userfiles/file/54165157854.pdfIn PDF document text
- https://ristovski.mk/public_html/upload/userfiles/file/kikaxeroxemawinezorabit.pdfIn PDF document text
- https://infravoip.com/wp-content/plugins/super-forms/uploads/php/files/c9c0aeadee8a05071602f8ca298ea40b/75849696918.pdfIn PDF document text
- https://www.fibertech1.com/my_content/js/ckfinder/userfiles/files/51171580266.pdfIn PDF document text
- http://shuimotongyuan.com/userfiles/file/sumoraxezivogazijadutuka.pdfIn PDF document text
- https://aihr-iadh.org/uploads/FCK_files/file/jigane.pdfIn PDF document text
- http://juentai.com/userfiles/files/77283833014.pdfIn PDF document text
- https://chrmglobal.com/userfiles/file/pipapanabatajem.pdfIn PDF document text
- http://aluminial.pnh.pt/js/ckfinder/userfiles/files/rarovebitexefi.pdfIn PDF document text
- http://anhuishangbiao.com/upload_fck/file/2021-9-3/20210903032837859175.pdfIn PDF document text
- http://corporatiegids.nl/uploads/files/7107648131.pdfIn PDF document text
- http://elturo.ru/img/upload/files/15124319121.pdfIn PDF document text
- http://automyjka.pl/automyjka.pl/userfiles/file/12005623623.pdfIn PDF document text
- https://eijo.in/ckfinder/userfiles/files/defonebigew.pdfIn PDF document text
- http://fatimaartwork.com/userfiles/file/mokovujonowuvavawini.pdfIn PDF document text
- http://westernmaki.com/uploads/files/23400185860.pdfIn PDF document text
- https://unibel.pl/pliki/upload/file/giwabolororatozotibi.pdfIn PDF document text
- http://agmapure.com/upload/files/70510946515.pdfIn PDF document text
- https://shieldtech.cz/ckfinder/userfiles/files/fejopixane.pdfIn PDF document text
- https://frontiermyanmar.com/sites/all/libraries/ckfinder/userfiles/files/tazosawesaki.pdfIn PDF document text
- http://ruihuitax.com/files/file/46372535697.pdfIn PDF document text
- http://artkulinaria.pl/sites/default/files/file/kepizexomutewaxomozudus.pdfIn PDF document text
- https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=app+drawer+launcherPDF link annotation
- 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_off0000ed55.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xED55	17700 bytes
SHA-256: `72d7877564667f451f1ca0ab02a512f2695559d3ae7eba0832a4a87fb7a5748a`
`font_01_sfnt_off00011c38.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x11C38	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_02_sfnt_off0001344f.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x1344F	10300 bytes
SHA-256: `0fd193affee2864f00f26cddaabe6aacc7086ac82233a76044082c4fa0917ff0`

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