PDF malware analysis — malicious · 40cfe118554b40ab

MALICIOUS

PDF

81.8 KB Created: 2021-09-16 16:14:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16

MD5: 75d2e451b22906ddf8d2f144348f850e SHA-1: 0888cac2bf3f1fba9d1ed80574bce78170bb1d9c SHA-256: 40cfe118554b40ab24f0e3399eba91ffc758445cb28482296a88ab7b0082bfaa

134 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a large number of external URIs, many of which are part of a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The embedded JavaScript is a common technique for exploiting PDF vulnerabilities or redirecting users to malicious sites.

Machine Learning

Nyx PDF Classifier malicious score 0.9975

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 https://medvor.ru/uplcv?utm_term=best+applock+android PDF link annotation
- http://alrabbanoilandgas.com/file/files/sokivi.pdfIn PDF document text
- https://alwillislifecenter.org/ckfinder/userfiles/files/51800364164.pdfIn PDF document text
- http://ckm-machinery.com/userfiles/files/76695163357.pdfIn PDF document text
- https://dortmundpools.com/contents/files/25723057671.pdfIn PDF document text
- https://palcev.ru/userfiles/file/13831818431.pdfIn PDF document text
- https://www.pollackmihalyiskola.hu/ckfinder/userfiles/files/41083633446.pdfIn PDF document text
- http://barrospizzadb.com/uploads/files/refapiwela.pdfIn PDF document text
- http://kingswaytyres.com/project/kingsway/uploads/file/99135618174.pdfIn PDF document text
- https://nirkongrp.com/ckfinder/userfiles/files/44159216589.pdfIn PDF document text
- http://f-okinawa.com/img/tmp/file/39937341501.pdfIn PDF document text
- https://familienbilstrup.dk/ckfinder/userfiles/files/govobezusamuruxu.pdfIn PDF document text
- http://scherzerpc.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/lisatulalej.pdfIn PDF document text
- http://www.hro.ait.ac.th/js/ckfinder/userfiles/files/vovomev.pdfIn PDF document text
- http://stauarchitetti.eu/userfiles/files/7857398501.pdfIn PDF document text
- https://mimpiindahsatu.com/contents/files/kebevajilo.pdfIn PDF document text
- https://humantouchtranslations.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/16137e6e2d5503---muwivutizazoz.pdfIn PDF document text
- http://adamlegal.com/userfiles/file/72939875718.pdfIn PDF document text
- https://niboparis.com/upload/fckeditor/files/wesunetelamajuduru.pdfIn PDF document text
- http://ayurvedicclinic.org/userfiles/file/wogimatumobinawexa.pdfIn PDF document text
- https://chambres-lannion.fr/userfiles/file/pofisibunulogufirababidef.pdfIn PDF document text
- http://studiogallerani.it/userfiles/files/subefa.pdfIn PDF document text
- http://www.thebetterinsurance.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136ca4ccaf05---41295099453.pdfIn PDF document text
- http://panel2conso.com/userfiles/file/33275109831.pdfIn PDF document text
- http://jungam21.com/upfiles/file/1631592996.pdfIn PDF document text
- http://ohxto.com/uploaded_files/userfiles/files/jegiv.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_off0000dbd1.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xDBD1	10652 bytes
SHA-256: `92c0d4efb1f9eaab083b8ae5afd66fe6db2b69118a4b67c8b960e42b2c8e8fea`
`font_01_sfnt_off0000f45e.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xF45E	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_02_sfnt_off00010c70.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x10C70	17436 bytes
SHA-256: `1c29c623e0ce459824d2d3428c64f325588f1650285a743ba1318fac0ece49a7`

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