PDF malware analysis — malicious · 7a7e5c16497d1a8b

MALICIOUS

PDF

78.4 KB Created: 2021-09-08 21:17:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07

MD5: b4f9df83b91e441cd79c8f69d2658d90 SHA-1: ed5f31284abd0e82f21d233abf43f3fb5fbb8f2b SHA-256: 7a7e5c16497d1a8b406d5779133dfaf67284f2c2721c3847ff557fe9599598cc

134 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to disposable hosting and form a link farm. This suggests the document's primary purpose is to redirect users to malicious content, likely a phishing page or a further malware download. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

Nyx PDF Classifier malicious score 0.9953

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 http://rurisnet.org/images/file/51509036618.pdf In PDF document text
- http://abdon.madteam.net/ckfinder/userfiles/files/dinatekib.pdfIn PDF document text
- http://mistral-paints.cz/userfiles/files/pakix.pdfIn PDF document text
- http://creaorganization.com/depo/sayfaresim/file/81496619753.pdfIn PDF document text
- http://caerulumpharma.com/upload/files/wirozorerogojurodusiba.pdfIn PDF document text
- http://chongthamphucthang.com/images/news/files/13373312315.pdfIn PDF document text
- https://cmf8.ir/data/file/21673506898.pdfIn PDF document text
- http://www.ctnphrae.com/ckfinder/userfiles/files/masoxaw.pdfIn PDF document text
- http://gewoongroen.eu/app/webroot/files/userfiles/files/95225829257.pdfIn PDF document text
- http://originalbau.hu/imagesfiles/15034672422.pdfIn PDF document text
- http://daisin1977.com/js/upload/files/vomasanegafi.pdfIn PDF document text
- https://bringem.de/wp-content/plugins/super-forms/uploads/php/files/1b956e49b9f1d52125fbf6b3458e4a7e/zuroduremiv.pdfIn PDF document text
- https://hamzsabegi60szallo.hu/UserFiles/File/6675834671.pdfIn PDF document text
- http://ttlengenharia.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/161348e8701d17---jixitegupumezojasit.pdfIn PDF document text
- http://upservice.expert/admin/ckfinder/userfiles/files/jazefodazu.pdfIn PDF document text
- https://www.baust.edu.bd/app/webroot/ckfinder/userfiles/files/fiwibuzolakasoluri.pdfIn PDF document text
- http://marinaxaraes.com.br/ckfinder/userfiles/files/96804496420.pdfIn PDF document text
- https://pmcp-avac.com/files/upload-ckfinder/files/minitoroxemotubujerabaj.pdfIn PDF document text
- http://anpo.vn/upload/files/10248115718.pdfIn PDF document text
- https://zaragozadenoche.es/upload/files/18477630947.pdfIn PDF document text
- https://searchlink.org/userfiles/file/82642838076.pdfIn PDF document text
- http://coreaad.com/DreamDataUpload/file/zaloromeluxemabazozo.pdfIn PDF document text
- http://architettipassarinmarzotto.com/userfiles/files/60039880142.pdfIn PDF document text
- https://myarchitect.es/ckfinder/userfiles/files/57325663618.pdfIn PDF document text
- https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=the+count+of+monte+cristo+bantam+abridged+version+pdfPDF 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_off0000ca40.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xCA40	18304 bytes
SHA-256: `5b3c80d9dcd3491599da3bdf6eecc618ec4c7e52668bd257977e113a4f77384d`
`font_01_sfnt_off0000f9b9.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xF9B9	11288 bytes
SHA-256: `034d96f15bc5add541fdf9c2d3f955fb7a72cb0d941dd84709e6a3b8e7ac730f`
`font_02_sfnt_off000113ac.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x113AC	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`

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