PDF malware analysis — malicious · 459cbc6c674af901

MALICIOUS

PDF

75.0 KB Created: 2021-09-13 08:14:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26

MD5: 906cb9dc0fbeda4b00ffc8b9df88b02c SHA-1: d34c6b905eec7a6a61f49e2c48744129f6e2922b SHA-256: 459cbc6c674af901401dc48ce39218faae9df76823ab59d74b397ea437c3e50b

134 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which are hosted on disposable domains and appear to be part of a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The presence of embedded JavaScript suggests an attempt to execute malicious code within the document.

Machine Learning

Nyx PDF Classifier malicious score 0.9908

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://catamma.ru/uplcv?utm_term=bulk+uninstall+android PDF link annotation
- http://rnralpha.cz/res/file/zigutoramimur.pdfIn PDF document text
- http://pinxedien.net/upload/files/nalagasowavadirufetunut.pdfIn PDF document text
- http://futboltotal.net/images/files/22161858769.pdfIn PDF document text
- http://www.agot.pl/upload/file/74517400018.pdfIn PDF document text
- http://eunlocker.com/Images/Editor/file/bogivomakugoxezab.pdfIn PDF document text
- https://hebatkeren88.com/contents/files/suzewetawone.pdfIn PDF document text
- https://capital-publishing.com/ckfinder/userfiles/files/49058906884.pdfIn PDF document text
- https://fishuntpesca.it/file/xopuduwasobafule.pdfIn PDF document text
- http://ausafe.net/images/art/files/lujuv.pdfIn PDF document text
- https://svenjakretschmer.com/ckfinder/userfiles/files/rojulovemajukujix.pdfIn PDF document text
- https://ip-kamera-rendszer.hu/ckfinder/userfiles/files/7907561647.pdfIn PDF document text
- http://enricobarraco.com/files/87582988134.pdfIn PDF document text
- http://technoauto.jp/js/upload/files/jisugerixile.pdfIn PDF document text
- https://gedayapi.com/userfiles/file/wipufatiliserudow.pdfIn PDF document text
- http://imbirimbir.ru/files/nekufenemaj.pdfIn PDF document text
- http://borik.customreal.sk/data/files/sojinelebikek.pdfIn PDF document text
- http://launensia.cz/ckfinder/userfiles/files/sifotebobopekubebopeparu.pdfIn PDF document text
- https://art-eria.pl/mandarynka/pliki/files/19815662338.pdfIn PDF document text
- http://flairpens.ru/uploads/file/32367077350.pdfIn PDF document text
- https://www.mobytec.com.br/mobytec/wp-content/plugins/formcraft/file-upload/server/content/files/1613405404214b---zatop.pdfIn PDF document text
- http://neoneofytou.com/ckfinder/userfiles/files/42779212257.pdfIn PDF document text
- http://saothienemb.com/uploads/images/files/24786071098.pdfIn PDF document text
- http://mnarch.it/userfiles/files/10442039789.pdfIn PDF document text
- http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613859d60745f---dovetafuru.pdfIn PDF document text
- https://hotararicedo.ro/files/files/96911574154.pdfIn PDF document text
- https://getlovebooks.com/wp-content/plugins/super-forms/uploads/php/files/52400fb0d65f6d5909051a89f8e296b9/16872995437.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_off0000c1f9.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xC1F9	10356 bytes
SHA-256: `81772db112586d0f2d278d1c3d0365170f0a06cea5181a61c9e758fea42ff03f`
`font_01_sfnt_off0000d977.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xD977	17224 bytes
SHA-256: `aec17656e0df262b32e20baafbba47a91a117f483021fce065cb10d8ad1762ad`
`font_02_sfnt_off000105d6.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x105D6	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`

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