PDF malware analysis — malicious · a23d29fc860b6ab4

MALICIOUS

PDF

83.0 KB Created: 2021-09-12 02:31:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26

MD5: b7bfa959b75a2480882db6b8967834c1 SHA-1: 5bf2623a44354eaab29b0dd41955e12553feefe5 SHA-256: a23d29fc860b6ab45fe6457b6f4e888a631f5a3d07651291735c2bea1b78e0a2

134 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, a common technique for delivering malicious payloads. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates the PDF likely uses a network of disposable domains to obscure the ultimate destination of the payload, suggesting a phishing or malware distribution campaign. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

Nyx PDF Classifier malicious score 0.9974

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://kor-ra.ru/UserFiles/file/57152837080.pdf In PDF document text
- https://stmpallet.com/ckfinder/userfiles/files/64171989658.pdfIn PDF document text
- https://araprinter.com/ckfinder/userfiles/files/wowegukikot.pdfIn PDF document text
- http://leadingedgecorporate.com/user_images/file/sabevelisu.pdfIn PDF document text
- https://exam10.menapoint.com/app/webroot/upload/files/81043853771.pdfIn PDF document text
- http://generaltubi.com/container/ckfiles/files/87146222075.pdfIn PDF document text
- https://xedulichhaiphong.vn/images/news/files/fixezezevejiwoxebutu.pdfIn PDF document text
- http://speed-r.com/js/upload/files/45884238307.pdfIn PDF document text
- http://queuemanagementsystems.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b4f8508b8b---zikivuzebatuvuninir.pdfIn PDF document text
- https://jmcoverseaspvtltd.com/uploads/files/pagopavopojavapiga.pdfIn PDF document text
- http://mousike.it/img_ins/files/60331231758.pdfIn PDF document text
- http://interreg-ipa-husrb.com/downloads/gasazijudanapidolerog.pdfIn PDF document text
- https://ekselantechnology.solutions/ckfinder/userfiles/files/vizukevovuruvutewopemen.pdfIn PDF document text
- http://yeongwonenc.com/userfiles/file/fadoror.pdfIn PDF document text
- http://anpo.vn/upload/files/xariga.pdfIn PDF document text
- http://kleinschadenexpert.com/userfiles/file/nonovowe.pdfIn PDF document text
- https://ganport.pl/userfiles/file/93092068368.pdfIn PDF document text
- http://prefinancovaniehypoteky.sk/res/file/24707209261.pdfIn PDF document text
- https://www.meditech.cz/ckfinder/userfiles/files/90870364989.pdfIn PDF document text
- http://www.barbazan-debat.fr/ckfinder/userfiles/files/82253683173.pdfIn PDF document text
- http://ekopaczka.pl/imgbrama/files/73518093374.pdfIn PDF document text
- http://ilonew.tasksplan.com/ckfinder/userfiles/files/88275916312.pdfIn PDF document text
- http://bielle-srl.com/userfiles/files/tubikatemasozexejemejob.pdfIn PDF document text
- https://www.cylinder96.ru/admin/ckfinder/userfiles/files/9777231489.pdfIn PDF document text
- https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=periodic+table+image+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_off0000de3b.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xDE3B	10832 bytes
SHA-256: `96d79e86556e3873e547fd6d5609c658140bcc17e0e92ce7f7f0e5e03cc37686`
`font_01_sfnt_off0000f6c6.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xF6C6	18664 bytes
SHA-256: `748bc63447846fc4cda66b67a73c6ce83a6a73c8bdd36686860676f68139a6fe`
`font_02_sfnt_off00012629.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x12629	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`

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