PDF malware analysis — malicious · 61b82b4f11efd4b6

MALICIOUS

PDF

97.0 KB Created: 2021-09-14 06:46:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16

MD5: 4879f982791cf8e8374c06ce8f615e5b SHA-1: 212c35cb49a2a5ff7c2a0e82c0f1da5dff004c8e SHA-256: 61b82b4f11efd4b6d38879b018a4f5e28fe7ea564de7b9a13d2e16689a7f47be

134 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a large number of external links, many of which point to disposable domains. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic indicates a link farm strategy, and the ML classifier and ClamAV detection strongly suggest malicious intent. The embedded JavaScript likely facilitates the redirection to or download of malicious content from these linked sites.

Machine Learning

Nyx PDF Classifier malicious score 0.9965

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://mudrberanova.cz/userfiles/file/pojekovojebofe.pdf In PDF document text
- http://eaupureinternational.com/userfiles/file/11652496798.pdfIn PDF document text
- https://kamhosting.nl/ckfinder/userfiles/files/voterudelamozupanegusijas.pdfIn PDF document text
- https://pagodatalk.com/_UploadFile/Images/file/retojevederiwozumaraj.pdfIn PDF document text
- http://gr-chem.com/upload/files/61950366241.pdfIn PDF document text
- http://3q1p.com/upload/file/210902053458699501b88n38m77gja.pdfIn PDF document text
- http://aviapartner.biz/js/ckfinder/userfiles/files/tikiregumunagegokuvo.pdfIn PDF document text
- http://reiki-roots.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16137d5a00d14d---xadevovogufer.pdfIn PDF document text
- http://kdekdyjak.cz/data/vezowizigufezeregoduvemo.pdfIn PDF document text
- https://promise-land.com/upload/file/29855652981.pdfIn PDF document text
- https://www.andeanskyline.com/wp-content/plugins/formcraft/file-upload/server/content/files/161352dcdebd4a---74594780969.pdfIn PDF document text
- http://barcabianca.eu/upload/file/xipufapurobi.pdfIn PDF document text
- http://mwcapital.net/ckfinder/userfiles/files/nujezuvirorubatuwelazezi.pdfIn PDF document text
- http://studiotrusso.it/userfiles/files/xawizanukufokalifu.pdfIn PDF document text
- http://sure2trips.com/bot/ckfinder/uf/files/rejimojigex.pdfIn PDF document text
- https://inprovitperu.com/ckfinder/userfiles/files/11551649180.pdfIn PDF document text
- https://catwalkdogcome.com/editor_upload_image/file/15218734992.pdfIn PDF document text
- https://pediatricpotentialsnj.com/PP/PPpng/files/20871233755.pdfIn PDF document text
- http://ff-engineering.com/userfiles/files/wotevevimuxazuzamefebet.pdfIn PDF document text
- http://chataphan.com/file_media/file_image/file/14405526068.pdfIn PDF document text
- http://satakantaresort.com/user_img/files/liririkuxutip.pdfIn PDF document text
- http://mq-water.net/upload/didunulubex.pdfIn PDF document text
- http://hcvitamin.com/webroot/img/files/jagumimifewejazadepo.pdfIn PDF document text
- http://nagyberki.hu/sites/default/files/fck_uploads/file/pajepawezenefumokutaseg.pdfIn PDF document text
- https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=2019+tamil+hd+moviesPDF 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_off000114c6.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x114C6	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_01_sfnt_off00012cdd.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x12CDD	10740 bytes
SHA-256: `0804743c9c1158097dbb45fafe76ccc58e6364998df75ac2693ebe942cba59d8`
`font_02_sfnt_off000145a0.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x145A0	18692 bytes
SHA-256: `9f644d1dc58ffb7c5a17dc883e28b8afbe91ed10b9d5a8a038b8fd6b08283478`

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