PDF malware analysis — malicious · a7cb2bbb7cd543d5

MALICIOUS

PDF

70.6 KB Created: 2021-09-10 19:30:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05

MD5: 7f6fdb722002cd2acccb7c1f21f5565e SHA-1: 64a03ad6220798f892c29ccb40c19b18ee1eb6f6 SHA-256: a7cb2bbb7cd543d58c2c2b30703ad5bb0a432fe82f3f0216b4acdc3ebd3e72a7

134 Risk Score

Malware Insights

MITRE ATT&CK

T1059.007 JavaScript T1566.001 Spearphishing Attachment

The sample was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains embedded JavaScript and numerous external URIs, suggesting it's designed to redirect users to potentially harmful websites. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports this, indicating a link farm on disposable hosting, commonly used for phishing or malware distribution.

Machine Learning

Nyx PDF Classifier malicious score 0.9978

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 https://ataru.site/js/ckfinder/userfiles/files/zopofapu.pdf In PDF document text
- http://hanilkwanla.com/uploads/files/38821543452.pdfIn PDF document text
- http://suncitygroup.ir/basefile/suncitygroupir/files/91505847145.pdfIn PDF document text
- http://sanarina-coaching.de/ckfinder/userfiles/files/wakijafujaworitiwazuzuf.pdfIn PDF document text
- http://wami.cc/data/files/30937749988.pdfIn PDF document text
- https://jpt.mysmartedu.com/uploadimages/files/37455831331.pdfIn PDF document text
- http://www.hj-bouwt.be/wp-content/plugins/formcraft/file-upload/server/content/files/161368c373b409---dumofarifazav.pdfIn PDF document text
- https://binarbaidservices.com/public_html/userfiles/file/dituboziwufafa.pdfIn PDF document text
- http://ttccid.com/userfiles/files/zixumuzidutuma.pdfIn PDF document text
- http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138138e4ead7---kabinerofagajufotikapiv.pdfIn PDF document text
- https://bliznacite.com/files/gexepugavofegexiwute.pdfIn PDF document text
- http://cuspsurgeons.com/userfiles/file/30196972575.pdfIn PDF document text
- https://nstyapi.com/resimler/files/wopepewif.pdfIn PDF document text
- http://lamay.de/userfiles/file/jazevogimikonadidadabefak.pdfIn PDF document text
- http://watch62.ru/files/files/vesotuvagaxujuwav.pdfIn PDF document text
- http://www.hj-bouwt.be/wp-content/plugins/formcraft/file-upload/server/content/files/161308d1f036b8---94921307424.pdfIn PDF document text
- https://renteci.com/imagens/file/78701468379.pdfIn PDF document text
- https://audreyheselmans.com/_files/file/faniz.pdfIn PDF document text
- https://jeevandeepspecialcare.com/ckeditor/ckfinder/userfiles/files/16756869976.pdfIn PDF document text
- http://sirinthepgroup.com/userfiles/file/defomil.pdfIn PDF document text
- https://tourgardan.com/basefile/tourgardancom/files/kawoloxujuwazolere.pdfIn PDF document text
- https://tidaksusah.com/contents/files/15862212710.pdfIn PDF document text
- https://tailormade-sales-marketing.com/userfiles/file/wapibetoburijudavub.pdfIn PDF document text
- https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=a+quiet+place+2+full+hdPDF 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_off0000b3ed.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xB3ED	15988 bytes
SHA-256: `785859a4015327e7990aca6f584c209740aae8bbadf836f4eb95c0b330e63e9d`
`font_01_sfnt_off0000dc74.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xDC74	10572 bytes
SHA-256: `6b4dbeceeaf99aef9fc91ddb0d8799c26b0f935640c33e964e3c09cd9babadb9`
`font_02_sfnt_off0000f492.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xF492	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`

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