PDF malware analysis — malicious · 29adefa47184aac0

MALICIOUS

PDF

67.9 KB Created: 2021-09-24 14:48:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24

MD5: aabd4240143c089e6d495443770ade32 SHA-1: 12af19b5e465303d23df7cb512a4715bdced882b SHA-256: 29adefa47184aac0d2ed081ea4943702ff84edc968c9fa49754d5f09711791d2

134 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

The sample is a PDF file containing embedded JavaScript, which is a common technique for delivering malicious content. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic indicates that the document hosts a large number of links on disposable domains, suggesting a phishing or malware distribution scheme. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to trick users into downloading further payloads.

Machine Learning

Nyx PDF Classifier malicious score 0.9957

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://boldogelet.hu/media/30942793411.pdf In PDF document text
- http://hfnhsw.com/upload/files/solonebosuvoxomomifomipu.pdfIn PDF document text
- http://mawaevents.com/uploads/file/9746298146.pdfIn PDF document text
- http://www.expo-hotel.com/english/wp-content/plugins/formcraft/file-upload/server/content/files/16135bafc005c2---15180005807.pdfIn PDF document text
- http://www.alfainstal.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16135cc5badc48---99253919246.pdfIn PDF document text
- http://gitimohammadilakhimpur.org/ckfinder/userfiles/files/78814927845.pdfIn PDF document text
- http://orsini-blasioli.it/userfiles/files/guwegujitopexatosu.pdfIn PDF document text
- http://tdbakademi.org/userfiles/files/wizoju.pdfIn PDF document text
- http://cbcom.fr/ressource/site-image/files/15208700620.pdfIn PDF document text
- http://faradtvandor.hu/picture/userfiles/file/simugibo.pdfIn PDF document text
- https://cesiedizioni.com/userfiles/file/21975343308.pdfIn PDF document text
- http://njbeihang.com/uploadfile/file///2021090503194423.pdfIn PDF document text
- http://print-resource.co.uk/ckfinder/userfiles/files/44205533889.pdfIn PDF document text
- http://bertrandetgastineaudesigners.com/userfiles/file/sidosizozurana.pdfIn PDF document text
- https://www.blondel-bois.fr/ckfinder/userfiles/files/31082367956.pdfIn PDF document text
- https://kamionosnyelvlecke.hu/userfiles/file/44612099237.pdfIn PDF document text
- https://popa.com.br/wp-content/plugins/super-forms/uploads/php/files/d479f6b8b0a4e0942f73033bb9047167/94527973345.pdfIn PDF document text
- https://memo-log.com/userfiles/file/zemuwuliraxe.pdfIn PDF document text
- https://mastirz.com/userfiles/files/71423170202.pdfIn PDF document text
- https://linlinline.biz/js/ckfinder/userfiles/files/wusedigunejeduzifiponis.pdfIn PDF document text
- https://grupo-bahia-real-estate.com/ckfinder/userfiles/files/70402811217.pdfIn PDF document text
- http://chemonova.com/FCKeditor/file/36053388794.pdfIn PDF document text
- http://worshipedia.mobi/sites/default/files/file/61664404927.pdfIn PDF document text
- https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=60+degree+wedge+lengthPDF 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_off0000ae11.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xAE11	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_01_sfnt_off0000c623.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xC623	14824 bytes
SHA-256: `e35d6f6cc15a7dfe6eef1da0d22303223a9ff36f69ffc55d5fb1c1685951e507`
`font_02_sfnt_off0000eb9b.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xEB9B	10264 bytes
SHA-256: `3ddb5fb5b26344da3e8f5b96587831c9d614720f6fa879c4d715c31307baab2e`

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