PDF malware analysis — malicious · d3a70a0e804b8bf8

MALICIOUS

PDF

78.3 KB Created: 2021-09-20 05:30:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31

MD5: 8343aef8d9803a16cedf04a3b5e0c00b SHA-1: eadde11d2373ba75c11a622d3b0276241bf924c0 SHA-256: d3a70a0e804b8bf8fc2bdda0820914f75ad4f3d50985a9542ac2e38841717093

134 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

The sample is a PDF file identified as malicious by ML classifiers and ClamAV. It contains embedded JavaScript and numerous external URIs, suggesting an attempt to redirect users to potentially malicious websites. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a large number of links pointing to disposable hosting, further supporting a phishing or malware distribution motive.

Machine Learning

Nyx PDF Classifier malicious score 0.9949

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://starroadchina.com/userfiles/file/34506424437.pdf In PDF document text
- http://edituj.cz/res/file/83999390888.pdfIn PDF document text
- http://mdknoodles.co/uploads/files/doduruzijevuvepepo.pdfIn PDF document text
- https://baxsporthorses.nl/userfiles/file/77641283034.pdfIn PDF document text
- http://sintniklaas.kinderopvangpimpeloentje.be/ckfinder/userfiles/files/lewamet.pdfIn PDF document text
- http://gestioniarmatoriali.it/9495118328.pdfIn PDF document text
- https://notofthisgalaxy.com/wp-content/plugins/super-forms/uploads/php/files/97o30ovih1jt8g6pkpqj97iobd/betasakinoragepojaju.pdfIn PDF document text
- http://stroyvodservice.ru/upload/File/gowapu.pdfIn PDF document text
- http://xn--e42bt3l.net/upfile/files/xipagojosuduxaziki.pdfIn PDF document text
- http://misr-consult.com/userfiles/file/dadokidukobunapexej.pdfIn PDF document text
- http://www.ebsjosepirosamaria.com/wp-content/plugins/formcraft/file-upload/server/content/files/16146238d20f61---43936362312.pdfIn PDF document text
- http://dkyangmei.com/uploadfile/file/2021090818260473499.pdfIn PDF document text
- http://6nergy.fr/6nergy/sites/default/user/file/72768371385.pdfIn PDF document text
- http://aiaato.com/FileData/ckfinder/files/20210910_4B68949D83AEC664.pdfIn PDF document text
- http://pokorny-podlahy.cz/UserFiles/File/59564405614.pdfIn PDF document text
- http://coinproject.com/userfiles/image/file/natazifi.pdfIn PDF document text
- http://quimis.org/js/ckfinder/userfiles/files/47115806172.pdfIn PDF document text
- https://coffeetuanvang.com/Images_upload/files/64911763509.pdfIn PDF document text
- http://nickels.design/ckfinder/userfiles/files/6206114285.pdfIn PDF document text
- https://mekongtransport.com/upload/userfiles/files/53594388139.pdfIn PDF document text
- http://m-styleauto.com/js/upload/files/99460751260.pdfIn PDF document text
- http://dzstock.com/Upfiles/file/navabofamin.pdfIn PDF document text
- http://neoclassicalmansions.com/uplds/file/28583468779.pdfIn PDF document text
- http://capitolmetrophysicaltherapy.com/files/files/38910508532.pdfIn PDF document text
- http://thechitay.com/uploads/userfiles/file/wuwawete.pdfIn PDF document text
- https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=pottery+game+mod+apk+downloadPDF 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_off0000cb5d.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xCB5D	10768 bytes
SHA-256: `c31829dae35e88abbf1d707bc8a76a0d0e854a90291b376910651afac59c779b`
`font_01_sfnt_off0000e405.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xE405	18472 bytes
SHA-256: `a382b277a03ca5d99c8f30d614bbcb1a8bfc8554d2d72a63e0229c6b878c46f1`
`font_02_sfnt_off000113b8.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x113B8	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`

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