PDF malware analysis — malicious · c38e18aaab829c7c

MALICIOUS

PDF

77.0 KB Created: 2021-09-10 10:23:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24

MD5: 4a463b4adbb0d58b2346b009749f6c30 SHA-1: 723b6faf2907c75d99f1e69650f460500150b59c SHA-256: c38e18aaab829c7c3a3691a2c98725c44487d1d25e5230124865ade6484c8d65

134 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to disposable domains and are structured as a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution via the linked PDFs. The embedded JavaScript is likely used to facilitate the redirection or obfuscate the malicious links.

Machine Learning

Nyx PDF Classifier malicious score 0.9963

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 http://vasekurzy.cz/userfiles/file/42784954520.pdf In PDF document text
- http://terfigyelokamera.info/files/file/jinipu.pdfIn PDF document text
- http://evergladesharvesting.com/ckfinder/userfiles/files/29919568569.pdfIn PDF document text
- http://sportservistocik.cz/UserFiles/File/jijukuvixojekukala.pdfIn PDF document text
- https://futurefacesnyc.com/uploads/file/bisinid.pdfIn PDF document text
- https://www.sensormaticltd.com/app/templates/js/ckfinder/userfiles/files/wazolezulamivum.pdfIn PDF document text
- http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1613aae50666d8---debufagevanulawaxitizogar.pdfIn PDF document text
- https://vleek.com/uploads/files/levuged.pdfIn PDF document text
- http://kingsbrite.com/kingsbrite.com/userfiles/file/jexujovugadibalakobinomu.pdfIn PDF document text
- https://vietnaminsight.biz/ckfinder/userfiles/files/xomujodosinosoziku.pdfIn PDF document text
- https://nacionalequipamentos.com/ckeditor/uploads/files/59954204621.pdfIn PDF document text
- http://www.mbk-montage.nl/ckfinder/userfiles/files/45338770762.pdfIn PDF document text
- http://playoz.com/ckfinder/userfiles/files/lusix.pdfIn PDF document text
- https://ozmutludokum.com/userfiles/file/kugamikiti.pdfIn PDF document text
- http://suachuaspa.com/upload/images-content/files/muzivaruzewolurur.pdfIn PDF document text
- http://meijialx.com/ckfinder/userfiles/files/vewaruropojozibasezo.pdfIn PDF document text
- https://kozlovka.mebel18.com/uploads/files/vepivadojokupopirokuko.pdfIn PDF document text
- https://dbhattacharjee.com/ckfinder/userfiles/files/59069117783.pdfIn PDF document text
- https://www.jancsoalapitvany.hu/ckfinder/userfiles/files/mabijixilesisusevaxerari.pdfIn PDF document text
- http://speednewslive24.com/assets/ckfinder/core/connector/php/uploads/files/92104232497.pdfIn PDF document text
- http://vtvxm.vn/userfiles/file/80501722053.pdfIn PDF document text
- http://yeongwonenc.com/userfiles/file/jebizikegitumixafowejaru.pdfIn PDF document text
- https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=considering+ethical+issues+in+data+collectionPDF 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_off0000cb6e.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xCB6E	16488 bytes
SHA-256: `e8a2bc99d6d477e1b6225ab36ba6fcfc43ba81de0f9f3714878985860f90198b`
`font_01_sfnt_off0000f5d6.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xF5D6	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_02_sfnt_off00010ded.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x10DED	10780 bytes
SHA-256: `552f5e05ce75b25518ba5dbbced6496fd880f88d3471ca8786f4f3c8bac3abfd`

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