PDF malware analysis — malicious · 73f2aa12ed21e3d1

MALICIOUS

PDF

69.8 KB Created: 2021-09-19 08:19:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16

MD5: 92c6db112ea574fd2339e787906b767e SHA-1: 73beb99643ab1c2957d8ffd47f1deb66ba81c4ac SHA-256: 73f2aa12ed21e3d107866d118f8ef0c9ec3c076c3e0d7c6b6d6b01d8f8da2a24

134 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

The sample is a PDF containing embedded JavaScript, which is a common technique for delivering malicious content. The PDF also exhibits characteristics of a link farm, with a large number of external URIs pointing to various domains, likely intended to redirect users to malicious sites or phishing pages. ClamAV detection and ML classification strongly indicate malicious intent.

Machine Learning

Nyx PDF Classifier malicious score 0.9951

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 https://uzunlarpeynir.com/dursun/upload/files/84572890004.pdf In PDF document text
- https://drosamahetta.com/userfiles/file/tikotafir.pdfIn PDF document text
- https://alperbehang.nl/userfiles/file/bixefufub.pdfIn PDF document text
- https://futuresbuilder.net/dayafter/uploadimages/newsimages/file/rewebesiginivekezejev.pdfIn PDF document text
- http://www.llmhospital.com/www/js/ckfinder/userfiles/files/tolofovolonevesomuvaferup.pdfIn PDF document text
- https://distriparkbotlek.nl/userfiles/files/rulerovuxaxuxumefibej.pdfIn PDF document text
- http://abwhopewell.com/uploads/files/megubuwezerepapera.pdfIn PDF document text
- http://salamino.pl/userfiles/file/dekukejukosisugapidatepez.pdfIn PDF document text
- https://ip-kamera-rendszer.nuttydog.hu/ckfinder/userfiles/files/fuxoxoduzedud.pdfIn PDF document text
- http://yuqiaohome.com/uploads/files/202109131530037296.pdfIn PDF document text
- http://expertworker.paraleumarian.ro/app/webroot/files/userfiles/files/fujabezokaketalakitid.pdfIn PDF document text
- http://hhsmelt.com/upload/files/kozosisupotibuwimofe.pdfIn PDF document text
- https://cedria.es/DOCUMENTS/FotosFCKEditor/file/27303598305.pdfIn PDF document text
- http://startent.ru/SITE/files/editor/file/67304118723.pdfIn PDF document text
- https://wyslijpaczki.pl/app/webroot/files/userfiles/file/47765051645.pdfIn PDF document text
- https://uat-tunisia.com/userfiles/file/ninavisuzodovobone.pdfIn PDF document text
- http://kvbm.org/pds/userfiles/files/80915397712.pdfIn PDF document text
- http://studiobardinisrl.com/userfiles/files/51179328702.pdfIn PDF document text
- http://normel.org/files/upload/file/tuxazoxowoxozamatuz.pdfIn PDF document text
- https://calson.garment-pro.com/ckfinder/userfiles/files/62263498780.pdfIn PDF document text
- http://dvif.fr/userfiles/file/nowefa.pdfIn PDF document text
- http://baheth24aqari.com/ckfinder/userfiles/files/63402015770.pdfIn PDF document text
- http://szilasfood.hu/pic_upload/files/jadurepik.pdfIn PDF document text
- http://ryyw.com/upload/files/2021/09/202109121906052370.pdfIn PDF document text
- https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=need+for+speed+most+wanted+hack+for+androidPDF 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_off0000b2ef.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xB2EF	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_01_sfnt_off0000cb01.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xCB01	14788 bytes
SHA-256: `e5b8c9a747b6ffdcb27fccefeda5371aee327b7699cb5199481aae32e4daec4d`
`font_02_sfnt_off0000f03e.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xF03E	10992 bytes
SHA-256: `3989aac0f40ae37d9bd72dbf5c694190645fe60d1a8c122989dbe82ecf0ea23a`

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