PDF malware analysis — malicious · c108bd6f8a0d5c27

MALICIOUS

PDF

85.3 KB Created: 2021-09-09 18:03:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16

MD5: 07fb89b43c19ca87d1d8052591f9ac19 SHA-1: d724f85c98262f80d4c465b053f6b9152b2cd185 SHA-256: c108bd6f8a0d5c272f9abd3fc3f69a0d1318092979a63afed4a0fb59f546a079

134 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

The sample was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains embedded JavaScript and numerous external URIs, suggesting it is designed to redirect users to potentially harmful websites. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports this, indicating a link farm structure likely used for phishing or malware distribution.

Machine Learning

Nyx PDF Classifier malicious score 0.9951

Heuristics 6

ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
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://schachverein-marchhoefe.ch/fcsr/news/upload/file/dewoxivujubinukokadis.pdf In PDF document text
- http://analogsys.com/uploaded/file/20654782126139c3e402737.pdfIn PDF document text
- http://nsk-nalogov.net/upload/files/vususu.pdfIn PDF document text
- http://remontnoedelo.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16139d5df75206---96383285901.pdfIn PDF document text
- https://ngaa.org.au/application/third_party/ckfinder/userfiles/files/tiwuxulipo.pdfIn PDF document text
- https://bhandarisurgical.com/ckfinder/userfiles/files/watimutejuzijuxemaneregu.pdfIn PDF document text
- http://deleersnijder-bocaege.be/images/file/41041672586.pdfIn PDF document text
- http://fw-simple.com/uploads/files/fevevagumasetada.pdfIn PDF document text
- http://artecgroupservices.com/imagenes/file/variren.pdfIn PDF document text
- https://mallorcaboom.com/res/wysiwyg/file/5260587388.pdfIn PDF document text
- http://autoklej.pl/app/webroot/media/files/84144910391.pdfIn PDF document text
- http://righetti-ticozzi.it/userfiles/files/kifewusutejojozozenop.pdfIn PDF document text
- http://www.farmaciavictoriayjmleon.com/userfiles/files/tarevasawejalirazuru.pdfIn PDF document text
- http://saiprogetti.net/userfiles/files/77265416571.pdfIn PDF document text
- http://nickels.design/ckfinder/userfiles/files/xazumokamikinokabej.pdfIn PDF document text
- https://artenika.pl/fck/file/24850462972.pdfIn PDF document text
- http://roberlo.cz/www/files/file/kuburerajutifas.pdfIn PDF document text
- http://kmkonsult.cz/userfiles/file/pesuxezonuwuxato.pdfIn PDF document text
- https://buildingexpertsdirectory.com/ckfinder/userfiles/files/pubawekozudu.pdfIn PDF document text
- http://battlegrouponline.com/app/webroot/js/ckfinder/userfiles/files/81262091793.pdfIn PDF document text
- http://jumpinfit.it/userfiles/files/xoseret.pdfIn PDF document text
- http://geoass.eu/userfiles/files/puzoximanibivij.pdfIn PDF document text
- http://www.melodypods.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139e8a774428---midado.pdfIn PDF document text
- http://tinhdauvietnam.vn/upload/files/49848729431.pdfIn PDF document text
- https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=what+is+the+best+free+movie+app+for+androidPDF 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_off0000ea64.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xEA64	10916 bytes
SHA-256: `3186cbf5c5484251c5c32544859a364e757b7c9f8b19a5bc12cf0bf31003d2b4`
`font_01_sfnt_off00010352.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x10352	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_02_sfnt_off00011b64.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x11B64	17180 bytes
SHA-256: `8a382f3c47920fa52d647d7d98e4af206b75a2efa1628fa22313b742a8491a5b`

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