PDF malware analysis — malicious · b44671183692d384

MALICIOUS

PDF

102.5 KB Created: 2021-03-24 13:50:53 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13

MD5: e31af5a04615d1e115a4da6335896d2b SHA-1: ed2f47ca1f306d20de69cc0c6b34b11a2afd169d SHA-256: b44671183692d3846be23ea8f8b4c615cec433dd2dfbc2493e0a685d48b0a792

166 Risk Score

Malware Insights

MITRE ATT&CK

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristic 'SE_BROWSER_INSTALL_LURE' suggests the document attempts social engineering by prompting the user to install a browser extension or update. The presence of numerous external URIs, including one pointing to 'jacksth.ru', suggests the document is designed to redirect users to malicious sites, likely to download further payloads or steal credentials. No scripts were extracted, but the PDF structure and external links point towards a phishing or malware distribution scheme.

Machine Learning

Nyx PDF Classifier malicious score 0.9998

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
Browser extension / update installation lure high SE_BROWSER_INSTALL_LURE

Document tells the user to install a browser extension, plugin, viewer, or browser update to view content — a common social-engineering path for credential theft and malware installation
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://jacksth.ru/strik?utm_term=sonicwall+tz+105+manual+pdf PDF link annotation
- https://sivoroxusakigob.weebly.com/uploads/1/3/1/4/131453081/demunakogu_pogikagulaberen_kagadusabilewe.pdfIn PDF document text
- http://sokuzise.iblogger.org/hemas_hospital_annual_report_2017.pdfIn PDF document text
- http://laregazobo.22web.org/purexan.pdfIn PDF document text
- http://lisipezasuk.iblogger.org/38381258758.pdfIn PDF document text
- https://reperitibomotij.weebly.com/uploads/1/3/1/3/131383541/kiwerororixegiwosit.pdfIn PDF document text
- https://cdn-cms.f-static.net/uploads/4470211/normal_604cdb311bf2b.pdfIn PDF document text
- https://cdn-cms.f-static.net/uploads/4475582/normal_604871eb26120.pdfIn PDF document text
- https://cdn-cms.f-static.net/uploads/4388276/normal_603283308e5d5.pdfIn PDF document text
- https://cdn.sqhk.co/wobuwozavenu/zTWjehg/xokojixeb.pdfIn PDF document text
- https://cdn.sqhk.co/wopidevepip/ihjcifh/87014156635.pdfIn PDF document text
- https://wupugosow.weebly.com/uploads/1/3/1/3/131382590/lakagup_wetaloxigug_dizovobip.pdfIn PDF document text
- https://kodidorimo.weebly.com/uploads/1/3/1/3/131380292/580b769b045ee.pdfIn PDF document text
- http://mofolaz.22web.org/how_much_do_petroleum_engineers_make_in_texas.pdfIn PDF document text
- https://static.s123-cdn-static.com/uploads/4375522/normal_5fc604216e619.pdfIn PDF document text
- https://regujimupakuve.weebly.com/uploads/1/3/5/3/135348903/fowizu.pdfIn PDF document text
- http://www.ascendercorp.com/In PDF document text
- http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
- http://www.daltonmaag.com/In PDF document text
- http://xejotapawadi.epizy.com/loginujosowitarepoguvoxow.pdfIn PDF document text
- http://rulenanevatetid.epizy.com/80012736749.pdfIn PDF document text
- http://mulunatebena.epizy.com/13103640654.pdfIn PDF document text
- http://xosekipile.rf.gd/57307776789.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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`font_00_sfnt_off00014449.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x14449	5356 bytes
SHA-256: `e9506ad1c4f5bc80f1b697a2bf438d407c86ddc59490c85e4d31c057fc128577`
`font_01_sfnt_off00015675.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x15675	11768 bytes
SHA-256: `b7ae27a1812fcbe58d5456a25f91b184d835e2a2e192c68388669d9666488d1b`
`font_02_sfnt_off00017e80.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x17E80	4324 bytes
SHA-256: `1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361`

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