PDF malware analysis — malicious · 5b232f72b5f13a02

MALICIOUS

PDF

80.1 KB Created: 2021-09-11 10:46:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23

MD5: 868535db689bdcd4a894bec1266f7ead SHA-1: ba9d57193e782d7afc047644ff2e90c27fcd04e4 SHA-256: 5b232f72b5f13a02b0ad8b861083849bb9acaf26a5aff038d93292a5e7bd8543

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 heuristics indicating embedded JavaScript and a high number of external links. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic suggests a link farm designed to obscure the true destination, likely for phishing or malware distribution. The embedded JavaScript is a common technique for executing malicious code within PDF documents.

Machine Learning

Nyx PDF Classifier malicious score 0.9981

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://studioguagnoni.it/userfiles/files/95290185729.pdf In PDF document text
- http://nakamurasangyou.jp/app/webroot/uploads/files/sidokamapuzupesosolano.pdfIn PDF document text
- https://peoplesmodelinternational.com/ckfinder/userfiles/files/2464585649.pdfIn PDF document text
- https://multimetrics.com/ckfinder/userfiles/files/jotopogosemomevo.pdfIn PDF document text
- http://clairerolo.com/userfiles/file/48967982256.pdfIn PDF document text
- http://vonschickenfremont.com/uploads/files/94589545143.pdfIn PDF document text
- https://pmeds.us/userfiles/file/bolupisowonuwa.pdfIn PDF document text
- http://divyabodhanam.org/userfiles/file/velevuwozofavam.pdfIn PDF document text
- http://webinaris.eu/ckfinder/userfiles/publics/files/buxirosowofinelaxelof.pdfIn PDF document text
- https://nordiskvillaventilation.dk/userfiles/file/tetaredunozitogugum.pdfIn PDF document text
- https://xn--80aaijz0c.xn--p1ai/ckfinder/userfiles/files/ronanemup.pdfIn PDF document text
- http://wolfroccatiassociati.it/userfiles/files/rozoni.pdfIn PDF document text
- https://webvitamin.vn/app/webroot/uploads/files/41785130845.pdfIn PDF document text
- https://hotelristorantenovecento.it/wp-content/plugins/super-forms/uploads/php/files/e99a1b34ddea2636e68a0d7100c2bdcd/wamokoma.pdfIn PDF document text
- http://cnzhongkui.com/fckeditor/editor/filemanager/connectors/php/uploads/file/020803323541.pdfIn PDF document text
- http://www.norestim.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16136b9831b6a1---lerovefalum.pdfIn PDF document text
- http://sjanzee.nl/file/marozokuritumiwepeb.pdfIn PDF document text
- http://gibisch.info/files/files/wuruvor.pdfIn PDF document text
- http://www.trackls.com/application/ckeditor/ckfinder/userfiles/files/nowetoxumipuxomabivazo.pdfIn PDF document text
- http://telecycling.org/files/file/42624280912.pdfIn PDF document text
- https://mk-promotions.com/ckfinder/userfiles/files/nikibelojiwogawunaxalotu.pdfIn PDF document text
- https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=pokemon+let%27s+go+pikachu+how+to+download+in+androidPDF link annotation
- https://www.assessment.unibe.ch/app/webroot/js/ckfinder/userfiles/files/gakuxibinugexodinanupaku.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_off0000d0d1.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xD0D1	18312 bytes
SHA-256: `1204c472519fe41635f1986c86ff7a3134a24f6faa0a4778d459fe00174ef81c`
`font_01_sfnt_off0001001e.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x1001E	11276 bytes
SHA-256: `336107b2e7ece91ec9b2bd6a9c3994f58156a5aab8998c97e43a13fa4857e3f0`
`font_02_sfnt_off00011a59.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x11A59	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`

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