PDF malware analysis — malicious · 629abcf64e5cae6c

MALICIOUS

PDF

73.9 KB Created: 2021-09-14 04:03:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26

MD5: 80be5210a0ce2f727167fa537f12b6aa SHA-1: 7b1cc69ae27848a5bdf443aa87ce66fb5830ed3d SHA-256: 629abcf64e5cae6c4b311f250dfc0c0a85792e7a7dc5cfe33f0891ac4db76255

134 Risk Score

Malware Insights

MITRE ATT&CK

T1059.007 JavaScript T1566.001 Spearphishing Attachment

The presence of embedded JavaScript and a high number of external links, many pointing to unknown domains, strongly indicates a malicious intent. The ML classifier and ClamAV detection further support this, flagging the PDF as malicious and a phishing trojan. The embedded JavaScript likely serves to download or redirect to a secondary malicious payload.

Machine Learning

Nyx PDF Classifier malicious score 0.9956

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 http://sapthagireesyathra.com/userfiles/file/julusilojuxefixot.pdf In PDF document text
- https://dildendilecevirievi.com/upload/ckfinder/files/63297469356.pdfIn PDF document text
- https://malimbe.africa/wp-content/plugins/super-forms/uploads/php/files/20a80aed891f2ecef37c3d403709e8dc/votenoneruw.pdfIn PDF document text
- https://xn--80aaijzh9b.xn--90ae/documents/file/movubokunotolonebos.pdfIn PDF document text
- http://www.thegrcinstitute.org/app/webroot/js/ckfinder/userfiles/files/1507234652.pdfIn PDF document text
- http://etalentlink.com/uploadfile/file///2021090918121898.pdfIn PDF document text
- http://sbriz.ru/userfiles/file/pazejokik.pdfIn PDF document text
- https://luxesystem.site/js/ckfinder/userfiles/files/40643399198.pdfIn PDF document text
- http://paletydozahrady.cz/ckfinder/userfiles/files/31056738132.pdfIn PDF document text
- http://hmondo.com/userData/board/file/83176341004.pdfIn PDF document text
- http://facyt.com.ar/ckfinder/userfiles/files/lutiravu.pdfIn PDF document text
- http://bjavc.com/filespath/files/20210902071900.pdfIn PDF document text
- https://twinslock.com/ckfinder/userfiles/files/45874762317.pdfIn PDF document text
- http://windowsplusllc.com/ckfinder/userfiles/files/dasun.pdfIn PDF document text
- http://www.ondebiz.com/userfiles/file/95066322847.pdfIn PDF document text
- http://polipadel.com/userfiles/file/24778352727.pdfIn PDF document text
- https://annekienlen.fr/imagesfile/88180864912.pdfIn PDF document text
- http://zelene-centrum.cz/webpagebuilder/ckfinder/userfiles/files/nunorir.pdfIn PDF document text
- https://precisionautoandac.com/wp-content/plugins/super-forms/uploads/php/files/267f32a90888dfcd6540a3c923407bdf/54131479256.pdfIn PDF document text
- https://panegovernance.com/ourprojects/chowki/UserFiles/file/samema.pdfIn PDF document text
- http://medicaldistri.com/ckfinder_files/files/fudemevezume.pdfIn PDF document text
- http://metallpress.info/files/majovofakome.pdfIn PDF document text
- https://istanbulbalbir.com/upload/ckfinder/files/goterisivaped.pdfIn PDF document text
- https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=design+patterns+javascript+pdfPDF 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_off0000bb4b.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xBB4B	17732 bytes
SHA-256: `62b42c7dc9e01f85caf24e53db6bf8ab3df42ceb19ec8d8d3ea654b7b44435c3`
`font_01_sfnt_off0000e927.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xE927	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_02_sfnt_off0001013e.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x1013E	10824 bytes
SHA-256: `0e3ac6c56e6d9d957bdc78eda8bf583a810473af5ea2044e55466e2da39fbad1`

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