PDF malware analysis — malicious · e023a52cfbce50e5

MALICIOUS

PDF

78.5 KB Created: 2021-09-20 18:45:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16

MD5: 538e6b94d4dc929c01526efcbb19c786 SHA-1: e5649fc0b6c4c30a7126f0de28b5a4945dbeeaa2 SHA-256: e023a52cfbce50e570eb0942954497df21e52bb65b1d23ea749a39fba632389d

146 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

The PDF document was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs pointing to various domains, many of which appear to be part of a link farm designed to obscure the ultimate destination. The 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic indicates a high likelihood of this document being used for malicious redirection or phishing campaigns.

Machine Learning

Nyx PDF Classifier malicious score 0.9958

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.
QR-code redirect lure medium SE_QR_LURE

Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
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://ajambary.com/userfiles/file/87485083524.pdf In PDF document text
- https://detskeihriska.eu/ckfinder/userfiles/files/fovelezetalizenezilorob.pdfIn PDF document text
- http://elma-itc.ru/!upload/files/82807506399.pdfIn PDF document text
- https://tomclarkvoiceovers.com/userfiles/files/gawumelaxawazolakuwuxatug.pdfIn PDF document text
- http://flairpens.ru/uploads/files/96348220424.pdfIn PDF document text
- http://nena-artspace.com/ckfinder/userfiles/files/jesogazarug.pdfIn PDF document text
- http://unite-chem.cn/upload/files/jalanojafanamagomako.pdfIn PDF document text
- https://www.displaysdirectaustralia.com.au/application/third_party/ckfinder/userfiles/files/katezuxalirujinedezuvero.pdfIn PDF document text
- http://rasmesafar.net/basefile/basefiles/2254866813.pdfIn PDF document text
- http://dush-kz.ru/uploads/fck/file/wowaxulovotigitix.pdfIn PDF document text
- https://quizai.com/uploads/files/79787127811.pdfIn PDF document text
- https://esterkins.de/ckfinder/userfiles/files/wetimevumenojuminu.pdfIn PDF document text
- http://www.psoealora.es/ckfinder/userfiles/files/wadezemomideminoxo.pdfIn PDF document text
- http://deborahmayerlawoffices.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/labejiburu.pdfIn PDF document text
- https://aptitudeclass.com/ckfinder/userfiles/files/15025804996.pdfIn PDF document text
- https://dcoderesearch.com/uploads/85494723990.pdfIn PDF document text
- https://yourdentist.ro/app/webroot/files/userfiles/files/zijodi.pdfIn PDF document text
- https://amartzon.store/wp-content/plugins/super-forms/uploads/php/files/01c7f19d8effc1141db24303a789e1e8/48034489166.pdfIn PDF document text
- http://orsini-blasioli.it/userfiles/files/gezikelexesose.pdfIn PDF document text
- http://rtm-plus.com/ckfinder/userfiles/files/kapigaz.pdfIn PDF document text
- http://gsprojekt.eu/userfiles/files/faxilisezexu.pdfIn PDF document text
- https://marksiegeldds.com/wp-content/plugins/super-forms/uploads/php/files/78414e0b467c9615078e2e8043e73384/7629814516.pdfIn PDF document text
- http://poddertradingandindustries.com/userfiles/file/jatumavokofekabakamoxenez.pdfIn PDF document text
- https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=file+transfer+app+from+android+to+pcPDF 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_off0000cf22.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xCF22	10756 bytes
SHA-256: `9d9cbbe79a8987787ace290eb991d9d390a1814fc7d614efe5d54195f112e83d`
`font_01_sfnt_off0000e7d2.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xE7D2	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_02_sfnt_off0000ffe4.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xFFE4	17284 bytes
SHA-256: `6711cd3d86142539bd7b4d2eebea0b0b6c999ae2b3573c0c6e0545b14c7b0ac7`

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