PDF malware analysis — malicious · 16f7aa109099ff35

MALICIOUS

PDF

82.3 KB Created: 2021-09-13 02:28:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24

MD5: 941db17fe4cbfb06ead1fa41f18dab2d SHA-1: 55e3691030a434c98a4fa2488f22c9ea29fbf044 SHA-256: 16f7aa109099ff350f7e715344a2e1374d7d01d5ca129118dc76d306642b5454

134 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, a common technique for executing malicious code within documents. The ML classifier and ClamAV detection strongly indicate malicious intent. The embedded JavaScript likely redirects to external URLs, as suggested by the PDF_URI and PDF_SEO_DISPOSABLE_LINK_FARM heuristics, which are often used for phishing or to download further payloads.

Machine Learning

Nyx PDF Classifier malicious score 0.9974

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 http://emekyesiltepe.net/images_upload/files/juwalosafa.pdf In PDF document text
- http://skncn.com/u/files/dotaxariso.pdfIn PDF document text
- https://www.wroclawmodelshow.pl/ckfinder/userfiles/files/37037452334.pdfIn PDF document text
- https://dbjadow.pl/attachments/file/49131720417.pdfIn PDF document text
- https://highlander-inn.com/assets/userfiles/files/98935640809.pdfIn PDF document text
- https://mysmartedu.com/uploadimages/files/nejinatal.pdfIn PDF document text
- https://quangcaowebsite.vn/uploads/files/sizovagifimaxesudud.pdfIn PDF document text
- https://albawadiroad.com/userfiles/files/xerixixiwalebofemejedatad.pdfIn PDF document text
- http://svadbavmoskve.com/content/xuploadimages/file/tenubopizefuva.pdfIn PDF document text
- https://rabudiagnostic.com/userfiles/files/475438965.pdfIn PDF document text
- http://johnmichaelharrisonlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/36515801845.pdfIn PDF document text
- http://mzch.pl/userfiles/file/50777904665.pdfIn PDF document text
- https://www.isgs.org/wp-content/plugins/super-forms/uploads/php/files/248107705f6990e45400106c2ca8b567/pukujajapi.pdfIn PDF document text
- http://bargiel.com.pl/ckfinder/userfiles/files/74001423373.pdfIn PDF document text
- https://invest.pl/userfiles/file/movudol.pdfIn PDF document text
- http://twilaw.com/files/files/gumarabalomodoxolorutat.pdfIn PDF document text
- https://aymexco.ro/ckfinder/userfiles/files/95553988534.pdfIn PDF document text
- http://shiinamotors.com/js/upload/files/gagalimigib.pdfIn PDF document text
- https://adsbudget.net/userfiles/file/87684432321.pdfIn PDF document text
- http://www.llmhospital.com/www/js/ckfinder/userfiles/files/23325206102.pdfIn PDF document text
- http://torby.kbo.pl/ckfinder/userfiles/files/57836391383.pdfIn PDF document text
- http://maslag.eu/userfiles/file/tonasizeraninukagetip.pdfIn PDF document text
- https://incoyun.com/calisma2/files/uploads/nenawixurex.pdfIn PDF document text
- http://cetinelektrik.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1613154927258e---43583724444.pdfIn PDF document text
- https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=download+teachmint+appPDF 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_off0000dd36.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xDD36	10600 bytes
SHA-256: `613b83f9224189b4fb331016e9ffecd90d193a82c9595043a9be73c9123b556e`
`font_01_sfnt_off0000f533.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xF533	18052 bytes
SHA-256: `dbed7d3ef267eaf04a9e008f4de48103d162026ff03c33cc7a7927c2c21320d6`
`font_02_sfnt_off0001236c.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x1236C	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`

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