PDF malware analysis — malicious · b1efdffda38f116d

MALICIOUS

PDF

75.9 KB Created: 2021-09-19 19:45:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11

MD5: 637fc85c95b7f052b9f41f6d72a0bad4 SHA-1: d85b078720b85853a6b07ff8c224da1450837c55 SHA-256: b1efdffda38f116d23a730eda79d967de16aaac5eca61d469d5b80b35ff98b77

132 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is a common technique for exploiting PDF vulnerabilities or redirecting users to malicious sites. The heuristic firings indicate the presence of external URIs and a link farm structure, suggesting an attempt to distribute malicious content or phish for information. The ML classifier and ClamAV detection strongly support the malicious nature of this file.

Machine Learning

Nyx PDF Classifier malicious score 0.5519

Heuristics 5

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
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://www.oomedia.com.tw/ckfinder/userfiles/files/joxodot.pdf In PDF document text
- https://delaneyllc.cfonewsletter.com/ckfinder/userfiles/files/93520923079.pdfIn PDF document text
- http://hongsung114.com/files/fckeditor/file/74608144545.pdfIn PDF document text
- https://art-gallery.mn/uploads/files/49946851193.pdfIn PDF document text
- https://cosplay-expo.it/ckfinder/userfiles/files/49016416519.pdfIn PDF document text
- http://autoscuolapezzano.it/userfiles/files/75560084142.pdfIn PDF document text
- https://commonwealthsportsawards.com/userfiles/file/71947236417.pdfIn PDF document text
- https://www.weboonline.com/ckfinder/userfiles/files/65867854868.pdfIn PDF document text
- http://www.191seo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16147589ccdba3---69841909583.pdfIn PDF document text
- http://twfindia.in/userfiles/files/xupelaxa.pdfIn PDF document text
- http://sportsgarten.com/editorData/file/43250407833.pdfIn PDF document text
- http://akademibt.com/resimler/files/zugiluguzojope.pdfIn PDF document text
- https://activsport.ro/userfiles/file/93304571351.pdfIn PDF document text
- http://abogadosaguilar.com/ckfinder/userfiles/files/jalegefirobaw.pdfIn PDF document text
- http://balie.overeembv-profielen.nl/upload/files/dafitarobakitado.pdfIn PDF document text
- https://xistenze.nagydavid.com/files/files/mefegoruka.pdfIn PDF document text
- http://s13cf5ef.alojamientovirtual.com/ropadefutbolbarata/userfiles/file/8020950476.pdfIn PDF document text
- http://chickenwild.com/upload/contents/images/images/82886603578.pdfIn PDF document text
- https://gulamanis.com/contents/files/minilo.pdfIn PDF document text
- http://locke-3c.tw/uploads/files/202109051417348393.pdfIn PDF document text
- http://hefei.chinatupai.com/web/js/ckfinder/userfiles/files/86024893680.pdfIn PDF document text
- http://rqconsultores.com/userfiles/file/wosisepofojujusubupo.pdfIn PDF document text
- https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=qr+code+reader+android+testPDF 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_off0000d461.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xD461	17652 bytes
SHA-256: `804033824b1b903d182edba3086c7d2187ff53662b3eaabd08273ed8802d358a`
`font_01_sfnt_off0001023b.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x1023B	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_02_sfnt_off00011a52.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x11A52	10376 bytes
SHA-256: `a35358e51eaed7b10515990d44355bfef1420bf5e074a1d466d242b28d1f762d`

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