PDF malware analysis — malicious · f4519533fab3f0fc

MALICIOUS

PDF

73.0 KB Created: 2021-09-28 08:09:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25

MD5: 02af90301b51e257f8829371fdc0a811 SHA-1: 8152418abb172fa26b77dbaea61d9d2f0bd335e0 SHA-256: f4519533fab3f0fc21ee363e6cf56c3240900edfc639c46b39ed223573392ceb

134 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains embedded JavaScript and numerous external URIs, many of which are part of a link farm hosted on disposable domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to direct users to phishing or malware-hosting sites. The embedded JavaScript is likely used to facilitate the redirection or exploit vulnerabilities.

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://teormech.ru/teormech/usrimg/file/nobuxizesararov.pdf In PDF document text
- http://amandamaitland.com/images/file/90826284541.pdfIn PDF document text
- https://pr-dienst.ch/file/15535935573.pdfIn PDF document text
- http://qwerty.pl/_data/file/85033410675.pdfIn PDF document text
- https://interativacorretora.com/fotosempresa/files/xowodejifoxejebilivi.pdfIn PDF document text
- http://konsultacjenaukowe.eu/Upload/file/vababewopima.pdfIn PDF document text
- https://luatsubienhoa.com/upload/ck/files/guwenilefuwalejekudarewom.pdfIn PDF document text
- http://ouhkpthaa.org/userfiles/molatixo.pdfIn PDF document text
- https://perfectsextherapy.com/public_html/userfiles/file/3431644498.pdfIn PDF document text
- http://app0.linkeo.it/ckfinder/userfiles/files/niduwivow.pdfIn PDF document text
- https://snabavto.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612ed5e1acc91---jigomegupilodetewedabono.pdfIn PDF document text
- http://www.whirlpool-beachcomber.at/wp-content/plugins/formcraft/file-upload/server/content/files/16140ba42b6366---58498516752.pdfIn PDF document text
- http://6nergy.fr/6nergy/sites/default/user/file/69777250955.pdfIn PDF document text
- http://pedraferro.com/files/files/11046149376.pdfIn PDF document text
- https://goodmix-psc.com/userfiles/files/72346052500.pdfIn PDF document text
- https://tsegypt.com/file/fefafibegezota.pdfIn PDF document text
- http://yusungchart.com/userData/board/file/miripijixebosuk.pdfIn PDF document text
- http://cachnhietwin.com/luutru/files/98753704749.pdfIn PDF document text
- http://delfosventures.com/userfiles/files/zewalowererikuvezekib.pdfIn PDF document text
- http://constantemails.com/userfiles/file/1632365664temoxenononitejubivipev.pdfIn PDF document text
- http://machi-tomo.xyz/js/ckfinder/userfiles/files/fiker.pdfIn PDF document text
- https://everywheregenes.com/uploadfile/qu26_qu106_com/files/tevaru.pdfIn PDF document text
- http://rdmsrl.it/userfiles/files/vitovoxa.pdfIn PDF document text
- http://andrenickels.de/ckfinder/userfiles/files/wejemaragulunagidozaviwe.pdfIn PDF document text
- https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=how+to+hide+apps+in+tabletPDF 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_off0000b7c4.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xB7C4	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_01_sfnt_off0000cfdb.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xCFDB	10608 bytes
SHA-256: `87bed5798901e72e1111cafc6655aa0a93c1b6d4f3c991c67f542a197d31f28d`
`font_02_sfnt_off0000e7cd.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xE7CD	18104 bytes
SHA-256: `325e655356d5ff86c9d6aa9edc33803349fa541f3871d387bed15fa76e325a75`

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