PDF malware analysis — malicious · f55b6de769fff1c1

MALICIOUS

PDF

76.3 KB Created: 2021-09-09 13:47:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26

MD5: 4a20ca09bb50e83bc43e033da86b9f46 SHA-1: 897ee1fe4d6cd39e1217a63c12f04e71c499c6fa SHA-256: f55b6de769fff1c131c1bf7554a73e2c0f10e39452f6dfa8ed34a22b8f799512

134 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The sample is a PDF containing embedded JavaScript, which is a common technique for exploiting vulnerabilities or delivering malicious content. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic indicates the document likely redirects users to a network of suspicious URLs, suggesting a phishing or malware distribution scheme. ClamAV detection as 'Pdf.Phishing.Trojan' further supports its malicious nature.

Machine Learning

Nyx PDF Classifier malicious score 0.9953

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://silesiacapital.eu/data/file/51370399796.pdf In PDF document text
- http://seowonbattery.com/files/fckeditor/file/45505701261310ecd00e75.pdfIn PDF document text
- https://apoc.com.au/wp-content/plugins/super-forms/uploads/php/files/2237a2a3d3ca47d7a738bafbbc42d30e/pijusipejavu.pdfIn PDF document text
- https://artcorner-fiberglass.com/userfiles/files/wawivurojumetoxutofu.pdfIn PDF document text
- https://alubiasdetolosa.com/files/galeria/files/muginaretuve.pdfIn PDF document text
- http://www.mezmat.ru/ckfinder/userfiles/files/51814724436.pdfIn PDF document text
- https://spencershaulageltd.co.uk/wp-content/plugins/super-forms/uploads/php/files/1fd27be71a8f4ed52164c72dc9b846e5/73783013363.pdfIn PDF document text
- https://triosms.com/userfiles/file/98216110670.pdfIn PDF document text
- http://av-jet.ru/userfiles/file/73547819223.pdfIn PDF document text
- http://sskj.pl/userfiles/file/kugemevodolod.pdfIn PDF document text
- http://lerucherdesanges.fr/userfiles/file/womebosi.pdfIn PDF document text
- https://openkomm.yussfone-crm.com/userfiles/file/46985816467.pdfIn PDF document text
- http://studiofantino.it/userfiles/files/50185246447.pdfIn PDF document text
- http://ecovn.vn/uploads/news_file/99666066975.pdfIn PDF document text
- https://trickapotisk.cz/webpagebuilder/ckfinder/userfiles/files/lasexulokadiwakigunizavad.pdfIn PDF document text
- https://www.andreivieru.com/ckfinder/userfiles/files/xaxidesobosi.pdfIn PDF document text
- http://nuraski.pl/wsg/userfiles/23750695697.pdfIn PDF document text
- http://exim5.hu/_user/file/93439440027.pdfIn PDF document text
- http://www.ramseier-appenzell.ch/elrada/js/ckfinder/userfiles/files/63887035640.pdfIn PDF document text
- https://adikmanis.com/contents/files/sebufaxupikirewekuputeze.pdfIn PDF document text
- http://jungvassar.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/47961738448.pdfIn PDF document text
- http://hutbephottaihaiphong24h.com/upload/files/tuzoraretoxipojekazif.pdfIn PDF document text
- http://maximaviajes.com/FCKfiles/file/23811162613.pdfIn PDF document text
- https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=android+rss+feedsPDF 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_off0000ca70.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xCA70	10020 bytes
SHA-256: `fec103522ad07fb662ec2227f313c52f780d4097485c14780bc48589a29d9e86`
`font_01_sfnt_off0000e0c9.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xE0C9	16772 bytes
SHA-256: `7117cada8db1f3840fd16ad628645dc36543257b95024bea501d75f021230078`
`font_02_sfnt_off00010c2a.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x10C2A	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`

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