PDF malware analysis — malicious · e36a07a3ff072e29

MALICIOUS

PDF

74.3 KB Created: 2021-09-10 17:00:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27

MD5: d58720cadbe429edb28f53f5e8611e39 SHA-1: 65cb969717943221de1f406cb5e2d938f06fd2cd SHA-256: e36a07a3ff072e291b6838ebbe450cb7e9e3e1d0b2c2f7c436356b15eb3211c3

134 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

The sample is a PDF file flagged by ClamAV as Pdf.Phishing.Trojan and a machine learning classifier. It contains embedded JavaScript, which is often used to exploit vulnerabilities or redirect users. The PDF also hosts a large number of external links, many pointing to potentially malicious domains, suggesting a phishing or malware distribution attempt.

Machine Learning

Nyx PDF Classifier malicious score 0.9973

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://malifer.hu/upload/file/koguxokodezurirovubewe.pdf In PDF document text
- https://castilloexterior.org/ckfinder/userfiles/files/17499199662.pdfIn PDF document text
- https://123natura.com/stockages/files/riwajuxokit.pdfIn PDF document text
- http://lerucherdesanges.fr/userfiles/file/sexujotedafegu.pdfIn PDF document text
- https://heart-calligraphy.com/uploads/files/202109070244138645.pdfIn PDF document text
- http://lamekatus.com/uploads/ckeditor/files/70167056322.pdfIn PDF document text
- http://thaisomboonautopart.com/userfiles/files/dimunir.pdfIn PDF document text
- http://chanhungcorp.com/images/uploads/files/67212896497.pdfIn PDF document text
- http://autosoftware.company/autoresponders_images/files/79437772371.pdfIn PDF document text
- https://wedding-photos.cz/userfiles/file/48072152427.pdfIn PDF document text
- https://www.travelknowhowscotland.co.uk/assets/js/ckfinder/userfiles/files/38920426266.pdfIn PDF document text
- https://holzhaus-suedtirol.it/wp-content/plugins/formcraft/file-upload/server/content/files/16138304c2858a---rebusujew.pdfIn PDF document text
- http://dooroc.com/tk/upload/file/24973279876.pdfIn PDF document text
- https://5a.ro/ckfinder/userfiles/files/52899481868.pdfIn PDF document text
- https://trouver-une-ssii.com/img/pics/files/nevipugigoz.pdfIn PDF document text
- http://maimungkorn.com/UserFiles/file/49404705390.pdfIn PDF document text
- http://accapierre.it/userfiles/files/2308267130.pdfIn PDF document text
- http://beruanglucu.com/contents/files/82942209627.pdfIn PDF document text
- http://cateringkieuan.com/uploads/userfiles/file/dogelunodavexumatovona.pdfIn PDF document text
- https://247christianity.org/fckeditor/userfiles/file/850949669201630996711.pdfIn PDF document text
- https://jaukiaplinka.lt/ckfinder/userfiles/files/basetezolopamitomovizum.pdfIn PDF document text
- https://www.theoakshealthcare.com/my_content/js/ckfinder/userfiles/files/sorus.pdfIn PDF document text
- http://kronospan-mofa.hu/editor_up/tomirevonisariluk.pdfIn PDF document text
- https://goldmenu.com/userfiles/file/49079947038.pdfIn PDF document text
- https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=probability+and+statistics+for+engineers+and+scientists+9th+edition+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_off0000bdd6.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xBDD6	11320 bytes
SHA-256: `66dc837e7ace224f2fb671b596cd0617ae9c6f23673ab7831ded7b79f6921aa9`
`font_01_sfnt_off0000d806.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xD806	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_02_sfnt_off0000f018.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xF018	16420 bytes
SHA-256: `2a3d8277d8d5cb8cdc9d1a8ae0cc1ec783f34924bbc5183cc6b3414f4308c8fe`

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