PDF malware analysis — malicious · 81dcd70f5b68d90d

MALICIOUS

PDF

79.1 KB Created: 2021-10-05 09:45:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25

MD5: 56eabd7d41d8182315072e694c1437dd SHA-1: 8db9d2284729c995cfcd2f3775bbe34e6b0cda84 SHA-256: 81dcd70f5b68d90d826029ce0ce6385bb75a7dc1b6ce5c4a1fd4b25cbc352db0

132 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 executing malicious code. The PDF also functions as a link farm, directing users to multiple external URLs, many of which are hosted on unknown or suspicious domains. This behavior strongly suggests a phishing or malware distribution attempt.

Machine Learning

Nyx PDF Classifier malicious score 0.7145

Heuristics 5

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
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://pnlestari.com/visitbali/image/files/zodazonururu.pdf In PDF document text
- https://ksdc.in/userfiles/file/xivenupuredofopute.pdfIn PDF document text
- http://aiswaryamatrimonials.com/fck_uploads/file/tamafipazedekamewi.pdfIn PDF document text
- https://lotteppta.net/beta/assets/file/bejale.pdfIn PDF document text
- http://tahyuh.com/uploads/files/202109280608134059.pdfIn PDF document text
- https://dnsbp.com/all4help/fckuserfiles/file/49561466547.pdfIn PDF document text
- https://girl0229960192.com/upload/users/files/33457427445.pdfIn PDF document text
- http://weilandvloeren.nl/fckimages/17530559565.pdfIn PDF document text
- http://machinegroup.ru/img/outer/files/6966801878.pdfIn PDF document text
- https://eurouniversal.eu/ckfinder/userfiles/files/palimanabufusalikes.pdfIn PDF document text
- https://www.projectorrentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/1615a83ce71a38---43605326253.pdfIn PDF document text
- http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/16156792c08c84---4700490024.pdfIn PDF document text
- http://www.sauminandy.com/fckimages/file/35705986025.pdfIn PDF document text
- http://riverla.vn/uploads/userfiles/file/kazulukotojemerixepir.pdfIn PDF document text
- http://mijn-nederland.nl/userfiles/file/xemajaf.pdfIn PDF document text
- https://rkdestate.com/userfiles/file/53161683462.pdfIn PDF document text
- http://giasuminhtam.com/Images_upload/files/46102810566.pdfIn PDF document text
- http://positiveforce.in/uploads/files/12040042205.pdfIn PDF document text
- http://sowa-architekci.pl/userfiles/files/lexarejiwavisozesebef.pdfIn PDF document text
- http://aviapartner.biz/js/ckfinder/userfiles/files/76619491857.pdfIn PDF document text
- http://www.egavilanes.com/ckfinder/userfiles/files/panomidalas.pdfIn PDF document text
- http://khachsanmyngoc.com/upload/files/xasojixifetagebonet.pdfIn PDF document text
- http://danchrisjewelry.com/userfiles/file/gapipefenodina.pdfIn PDF document text
- https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=lesson+4.2+practice+b+algebra+1+answersPDF link annotation
- 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_off0000dd7f.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xDD7F	11048 bytes
SHA-256: `8220bd76f86cde443066330d41bab55ba0e6274edac29b141f70a9752561c960`
`font_01_sfnt_off0000f758.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xF758	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_02_sfnt_off00010f6a.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x10F6A	19240 bytes
SHA-256: `448fd45ea53b0aa8a4c9551fa935a151cfd7e403396dd35401b58ecc51c5e706`

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