PDF malware analysis — malicious · accba300e9f4da70

MALICIOUS

PDF

73.5 KB Created: 2021-09-26 15:51:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26

MD5: 3d01dd03c7344cee4f36291eb783441d SHA-1: 2cf744deec897a9b2d30df943d1860c907c53785 SHA-256: accba300e9f4da70569270acb5973958862c7fa6bd1a9d09291ba93490522ccf

134 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1059.007 JavaScript

The sample is a PDF file flagged by ML classifiers and ClamAV as malicious. It contains embedded JavaScript and numerous external URIs, many of which point to disposable domains and are likely used to redirect users to malicious sites. The heuristic PDF_SEO_DISPOSABLE_LINK_FARM indicates a link farm strategy, suggesting the PDF's primary purpose is to drive traffic to these external resources.

Machine Learning

Nyx PDF Classifier malicious score 0.9973

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 http://ct-tci.com/cttax/userfiles/files/kuxeloromoxeguroguxisuvog.pdf In PDF document text
- http://bukharageorgia.com/sites/default/files/file/xiletikevufobapoxedofuw.pdfIn PDF document text
- http://crestviewshopping.abwingsmd.com/uploads/files/razezaniwawog.pdfIn PDF document text
- http://grafitym.kz/files/file/betovejakuduw.pdfIn PDF document text
- http://wsm.hk/images/files/60392442275.pdfIn PDF document text
- http://gibisch.com/files/files/73669407566.pdfIn PDF document text
- http://thenikharvconsultancy.com/userfiles/file/daxuzujarilakojase.pdfIn PDF document text
- https://paulogomeslda.com/userfiles/file/47769288122.pdfIn PDF document text
- https://aftaplan.com/works/peepsparty/html/upload_files/file/vaxilisakadivegitaponowa.pdfIn PDF document text
- http://innotack.com/userfiles/files/zafisamivedavi.pdfIn PDF document text
- http://socialbomjesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/16132c589bf4f5---depozeriwubumade.pdfIn PDF document text
- https://livresdarts.com/ckfinder/userfiles/files/11085181523.pdfIn PDF document text
- http://bidmitt.com/img/files/file/95301120933.pdfIn PDF document text
- https://takipcisec.com/calisma2/files/uploads/70473594724.pdfIn PDF document text
- https://sdhouse.info/ckfinder/userfiles/files/xunazusesokudaxirukefazak.pdfIn PDF document text
- https://aawyx.com/sites/default/imageuser/file/suvafozirones.pdfIn PDF document text
- http://theclubburger.com/uploads/files/kezixu.pdfIn PDF document text
- https://bipalisdemo.dashindonesia.com/userfiles/files/wexufapuf.pdfIn PDF document text
- https://zaragozadenoche.es/upload/files/35946786801.pdfIn PDF document text
- http://brava-ekb.ru/userfiles/file/nafixan.pdfIn PDF document text
- https://www.rougeindigo.com/ckfinder/userfiles/files/92711731249.pdfIn PDF document text
- https://idealist.ro/userfiles/file/botoxukufokupumekunuj.pdfIn PDF document text
- https://sfasg.jp/js/ckfinder/userfiles/files/mosavipupobev.pdfIn PDF document text
- http://vrtaspol.cz/klienti/devel/sneznerolby.cz/ckfinder/userfiles/files/66758973716.pdfIn PDF document text
- http://stapper.de/sites/default/files/userfilesfile/webox.pdfIn PDF document text
- https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=the+secret+of+the+nagas+pdfPDF 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_off0000b70f.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xB70F	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_01_sfnt_off0000cf26.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xCF26	10724 bytes
SHA-256: `bef46e490415a4cab182dcb446df8d4bad812a4fc8b0473ac3c934a09e7f519c`
`font_02_sfnt_off0000e78c.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xE78C	19252 bytes
SHA-256: `1b76634d49ed111805d185b3e78c629eb99b2184308225ee917713735c588424`

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