PDF malware analysis — malicious · 2621cbcebbfc1007

MALICIOUS

PDF

72.0 KB Created: 2021-09-27 19:05:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24

MD5: 8555883a306a1b9c4b871ec5cb502ea1 SHA-1: 0a1d073a5ff5b5faabfb8c9fabaff56f23ae1af5 SHA-256: 2621cbcebbfc10072eabdfddcc101c3f51dba56a2f33ab95cf320a37636a0c20

134 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is a common technique for delivering malicious content. The ML classifier and ClamAV detection strongly indicate maliciousness. The embedded JavaScript likely redirects the user to a series of URLs, forming a link farm, as evidenced by the numerous extracted URLs and the PDF_SEO_DISPOSABLE_LINK_FARM heuristic.

Machine Learning

Nyx PDF Classifier malicious score 0.9971

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=android+tablet+second+screen+mac PDF link annotation
- http://fjzy18.com/image/uload/files/96013747512.pdfIn PDF document text
- http://aaaexpressac.com/userfiles/file/pekizewewik.pdfIn PDF document text
- https://www.tulsarad.com/my_content/js/ckfinder/userfiles/files/1074843012.pdfIn PDF document text
- http://www.oomewatersport.nl/upload/files/pagiwebatinupuku.pdfIn PDF document text
- https://jbdclothiers.net/emailer/userfiles/file/patixipefas.pdfIn PDF document text
- https://rjpexport.com/files/ladodigifomopodaguruse.pdfIn PDF document text
- http://www.roosprommenschenckelfoundation.nl/ckfinder/files/files/munedododaxinizitijuk.pdfIn PDF document text
- https://natyabio.com/uploadfiles/wupaf.pdfIn PDF document text
- http://musorcentrum.around.hu/files/article/file/dedugejamovob.pdfIn PDF document text
- http://www.shipsupply.co.mz/wp-content/plugins/formcraft/file-upload/server/content/files/1613ab2b00b6b1---loloma.pdfIn PDF document text
- http://chelseacarpet.com/ckfinder/userfiles/uploads/82578200499.pdfIn PDF document text
- http://hanahana.vn/media/ftp/file/zogarodasugopome.pdfIn PDF document text
- http://av72-reklama.ru/userfiles/file/16317552738cf430867408678d1a5a.pdfIn PDF document text
- http://barsugo.com/ckfinder/userfiles/files/nidovalubif.pdfIn PDF document text
- https://kubermatkaplay.com/ckfinder/userfiles/files/goboxufajakerasodevojizow.pdfIn PDF document text
- http://ifaistos.reality.gr/~triantaf/images/file/wexowususu.pdfIn PDF document text
- http://neapol-m.ru/usr/file/dubobo.pdfIn PDF document text
- http://galsabino.it/userfiles/files/xanebapurabofagevowilego.pdfIn PDF document text
- http://lejonhund.com/upload/dojikekanukigobogatij.pdfIn PDF document text
- http://premiumresourcing.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614ed49a7d0d2---dirigobabekumeziv.pdfIn PDF document text
- https://dm288.com/slicice/file/mejosu.pdfIn PDF document text
- http://xn--12cbg9dihj7egda2g6a7dceb1d2cp4nvgf4f.com/datas/files/zekiguvok.pdfIn PDF document text
- https://www.agro-zavod.ru/app/webroot/js/ckfinder/userfiles/files/muwigonow.pdfIn PDF document text
- https://xn--80apefbdm9ah5g.xn--p1ai/userfiles/rejasofivifodigen.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_off0000b58f.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xB58F	17388 bytes
SHA-256: `da457897dea7615f862d598ac554bfb3dad8c109d7e30b666e9cb7323b49955c`
`font_01_sfnt_off0000e1a1.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xE1A1	10652 bytes
SHA-256: `4aed8549392bfa061a9ea15f7df134aa715161a7132aa0a5b2a1728330ad8984`
`font_02_sfnt_off0000fa03.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xFA03	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`

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