PDF malware analysis — malicious · 38eef376678e77d8

MALICIOUS

PDF

70.0 KB Created: 2021-09-20 02:46:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14

MD5: 1db01157b75a72a94c4d7b07fe5b8ce6 SHA-1: 5630917c6afd252a8a5a7080845bbf27080446c2 SHA-256: 38eef376678e77d8cc180f6f48ef108b13e324e8e7c8ae3ce525e2c6b5a08a3c

134 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is a common technique for executing malicious code within documents. The heuristic firings indicate the presence of external URIs and a link farm, suggesting the PDF's primary purpose is to redirect users to potentially malicious websites. The ML classifier and ClamAV detection strongly support its malicious nature.

Machine Learning

Nyx PDF Classifier malicious score 0.9975

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://basse-normandie.annuaire-regional.com/ckfinder/userfiles/files/betatufapero.pdf In PDF document text
- http://auto-rad.pl/userfiles/file/delatupomewimedu.pdfIn PDF document text
- http://lovepetclinics.com/file_media/file_image/file/12853846131.pdfIn PDF document text
- http://gilendor.cz/userfiles/file/lumorago.pdfIn PDF document text
- http://maketmaster.ru/admin/ckfinder/userfiles/files/kujolulakekageterazap.pdfIn PDF document text
- https://cvsc.co/userfiles/file/49473230918.pdfIn PDF document text
- http://dentalweek.eu/userfiles/files/21924068159.pdfIn PDF document text
- https://casalindasbakery.com/ckfinder/userfiles/files/56709176178.pdfIn PDF document text
- http://honmamon-s.com/img_seminar/userfiles/file/98391045392.pdfIn PDF document text
- https://onsale.social-push.cc/data/fckeditor/files/27383178725.pdfIn PDF document text
- http://www.cargeacrew.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1614010e9c3de2---99963450625.pdfIn PDF document text
- http://ontis.sk/editor_uploads/system/files/batijadozijetaxemew.pdfIn PDF document text
- https://www.ijestr.com/ckfinder/userfiles/files/16662569545.pdfIn PDF document text
- http://culfordequestriancentre.org/UserFiles/file/tevarexupepevaxiw.pdfIn PDF document text
- https://henseltech.cz/userfiles/file/fugunubudozar.pdfIn PDF document text
- https://adsbudget.net/userfiles/file/nosowivizotikovi.pdfIn PDF document text
- https://www.fibertech1.com/my_content/js/ckfinder/userfiles/files/mimiraxerugamubidukaz.pdfIn PDF document text
- http://dtyxbpzx.com/filespath/files/20210903012052.pdfIn PDF document text
- http://adbuilder.at/ckfinder/userfiles/files/66959699381.pdfIn PDF document text
- http://vwtint.com/userData/board/file/vopepajar.pdfIn PDF document text
- http://futimisdev.com/userfiles/file/19347932688.pdfIn PDF document text
- http://www.taxivanclass.com/uploads/ckfinder/files/zeweta.pdfIn PDF document text
- http://kpdb.org/userfiles/files/60781537252.pdfIn PDF document text
- https://gadesign52.com/uploads/files/202109081434071083.pdfIn PDF document text
- http://newcityhk.com/userfiles/48888836527.pdfIn PDF document text
- https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=wifi+hack+with+pcPDF 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_off0000b482.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xB482	15248 bytes
SHA-256: `950aeaba70c83e1413e5eccd020bb3f5c4af1f6971e4796057bf4e737d92ff5c`
`font_01_sfnt_off0000db89.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xDB89	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_02_sfnt_off0000f3a0.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xF3A0	10080 bytes
SHA-256: `6621c11d5d378e7d3d2176327c012ff279f62f61e3d8c571104dc44dc40a8c15`

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