PDF malware analysis — malicious · c694fc43bf4b2251

MALICIOUS

PDF

70.6 KB Created: 2021-09-30 23:59:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26

MD5: 7ad61055eb50d5eb2d5b169ac1ad4067 SHA-1: 96632e0edce97b85547a9648fdf5fb373ae48073 SHA-256: c694fc43bf4b2251408434058f2305d0c165e15059871cfb192e7e0b91ba9135

134 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, indicating an attempt to redirect the user to malicious websites. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' further supports the malicious nature by identifying the PDF as a link farm on disposable hosting.

Machine Learning

Nyx PDF Classifier malicious score 0.9975

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://catamma.ru/uplcv?utm_term=what+can+i+make+with+redstone+in+minecraft PDF link annotation
- http://topoint.cc/userfiles/fckFile/20210902231637.pdfIn PDF document text
- http://lt101shop.com/userfiles/files/96756195940.pdfIn PDF document text
- http://tuvanthanhlapcongty.biz/upload/ck/files/jetapo.pdfIn PDF document text
- http://friend5190.xyz/js/ckfinder/userfiles/files/lofepiledonozaxe.pdfIn PDF document text
- http://kdesignuk.com/userfiles/files/wilojakirilutit.pdfIn PDF document text
- http://s8radziejowice-paszkow.pl/userfiles/file/97500171333.pdfIn PDF document text
- https://ou-ravda.com/ckfinder/userfiles/files/boxizut.pdfIn PDF document text
- http://indemo.pl/Image/files/duzimerifepesekavemawotoz.pdfIn PDF document text
- http://websteravelandscaping.com/editorData/file/66316347874.pdfIn PDF document text
- http://rencontres-icare.org/userfiles/file/28009767124.pdfIn PDF document text
- https://bocion.com/ckfinder/userfiles/files/xigonorunabiravujaxuwa.pdfIn PDF document text
- http://newtarrytowndeli.com/uploads/files/79811387795.pdfIn PDF document text
- http://cameronhaddock.com/wp-content/plugins/formcraft/file-upload/server/content/files/16152870f7c003---85099203812.pdfIn PDF document text
- http://naszymsladem.pl/upload/file/pibipinis.pdfIn PDF document text
- http://networkinglikepro.com/ckfinder/userfiles/files/bewuzalopemuzosa.pdfIn PDF document text
- http://sakirnoopo.ru/wp-content/plugins/super-forms/uploads/php/files/14a886e93fa2c018470f8d95d56bb853/14323721608.pdfIn PDF document text
- http://viprealestatebrokers.com/userfiles/files/16799762416.pdfIn PDF document text
- http://kondicionery-domodedovo.ru/upload_picture/file/62632026676.pdfIn PDF document text
- http://f-okinawa.com/img/tmp/files/83651947647.pdfIn PDF document text
- https://arranridingclub.com/fwd_docs/file/kivonopesigaramusolodegi.pdfIn PDF document text
- http://dlastudenta.org/Upload/file/4447077988.pdfIn PDF document text
- http://kondicionery-vidnoe.ru/upload_picture/file/wagowevuwobesusulu.pdfIn PDF document text
- https://mylin.in/ckeditor/ckfinder/userfiles/files/51874217271.pdfIn PDF document text
- http://marketingnews.fr/images/file/mapobeguputapesuberixumo.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_off0000b311.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xB311	15804 bytes
SHA-256: `5e2472f3ca28d8804917197bd1db86f33a4878c6789f3cf43cc03677bcabc591`
`font_01_sfnt_off0000db4e.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xDB4E	10868 bytes
SHA-256: `4a5ea83023018d1becbf05b61e84439e137ba9c71bf73d5d4e80fe024b8c6cab`
`font_02_sfnt_off0000f453.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xF453	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`

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