PDF malware analysis — malicious · b3ad5eaa3f1d6ceb

MALICIOUS

PDF

74.5 KB Created: 2021-09-25 02:04:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25

MD5: a2e2bdec09170c1c44cb3354e62dc5b4 SHA-1: 623b7d605704567c083a989f245e3689f3d2aa97 SHA-256: b3ad5eaa3f1d6ceb0567e1a748cd51826cb155dd4323e5398575670eef38a75c

134 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

The sample was identified as malicious by ClamAV and an ML classifier, with high confidence. It contains embedded JavaScript, a common technique for executing malicious code within PDFs. The PDF also exhibits characteristics of a link farm, with numerous external URIs pointing to potentially malicious or phishing sites. The embedded JavaScript likely facilitates the redirection to these external sites, serving as a lure for users.

Machine Learning

Nyx PDF Classifier malicious score 0.9973

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://www.horakgolf.cz/ckfinder/userfiles/files/8127098026.pdf In PDF document text
- http://hangtatmj.com/userfiles/maworibelu.pdfIn PDF document text
- http://mundialimportweb.com/userfiles/file/1912146911.pdfIn PDF document text
- https://hargagila.com/uploads/image/files/dozemigu.pdfIn PDF document text
- http://caythuocnam.org/images/files/muvuvojitosudibitu.pdfIn PDF document text
- https://hmradiatoriai.lt/images/files/83355176930.pdfIn PDF document text
- https://www.hungarianassociation.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612ffc15e8102---92374654880.pdfIn PDF document text
- https://pchome.uzai.ca/upload/files/vosujozenofiwu.pdfIn PDF document text
- https://solturism.ro/images/file/viriditizotezowo.pdfIn PDF document text
- http://fulepmark.hu/nyebu/fulepmark/userfiles/file/69434665891.pdfIn PDF document text
- http://yuli-china.ru/d/files/22176277216.pdfIn PDF document text
- https://bloc-immo.com/images/riginawosid.pdfIn PDF document text
- http://shangyi-pump.com/uploads/file/050232351599.pdfIn PDF document text
- http://adimhukuk.com/resimler/files/tazeninexufor.pdfIn PDF document text
- http://upnbkk.com/file_media/file_image/file/84232204817.pdfIn PDF document text
- http://chretkinia.pl/userfiles/file/99931375863.pdfIn PDF document text
- https://festival-bg.com/media/ckuploads/files/56684091418.pdfIn PDF document text
- http://iraneto.com/basefile/iranetocom/files/93283110499.pdfIn PDF document text
- http://chrisnoblelaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/68855116085.pdfIn PDF document text
- http://cathyourhair.nl/js/ckfinder/userfiles/files/welixibilutimusoxezobut.pdfIn PDF document text
- http://originalcheck.it/public/img_admin/file///34686756400.pdfIn PDF document text
- http://alpha-cp.com/userfiles/file/zagawokugat.pdfIn PDF document text
- http://bimbrlata.cz/UserFiles/File/85259751383.pdfIn PDF document text
- https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=arrival+of+the+birds+piano+pdfPDF link annotation
- http://s250801404.onlinehome.fr/img/uploaded/file/49595251799.pdfIn PDF document text
- 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_off0000bde9.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xBDE9	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_01_sfnt_off0000d5fb.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xD5FB	17724 bytes
SHA-256: `af75ce09af9fa1779a533edf04a1a37276bf1241db5860a11cee994e373840da`
`font_02_sfnt_off00010374.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x10374	10784 bytes
SHA-256: `ccf2d822cb02c1b67712f4a5b12e0817668788ad13ead9efb10fad87769917bf`

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