PDF malware analysis — malicious · 87e0308ce3b71254

MALICIOUS

PDF

84.9 KB Created: 2021-09-13 18:13:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16

MD5: 46be0bc04dd6d9cb9f96a2196142af1f SHA-1: 4b2c73158cff7ce7c994d7302509fcf4d1a72d77 SHA-256: 87e0308ce3b71254ea905032b2b91bb78ffacdad7980656c39213fed78d1ea2e

134 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is a common technique for exploiting vulnerabilities or redirecting users to malicious sites. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' and the numerous unknown URLs suggest an attempt to distribute malware or conduct phishing by directing users to a variety of potentially compromised or disposable domains. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

Nyx PDF Classifier malicious score 0.9974

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://copingconversations.com/userfiles/file/71329864499.pdf In PDF document text
- https://kamhosting.nl/ckfinder/userfiles/files/geguloz.pdfIn PDF document text
- http://vinhthuan.com/upload/files/forodaxiz.pdfIn PDF document text
- https://kvgrup.com.ua/wp-content/plugins/formcraft/file-upload/server/content/files/1613e211478bad---fifevejewop.pdfIn PDF document text
- https://mkserwis.pl/userfiles/file/fetivivufexeva.pdfIn PDF document text
- http://cps-mbstu.edu.bd/app/webroot/js/ckfinder/userfiles/files/xipufodabegizavo.pdfIn PDF document text
- https://phoenixturkey.com/upload/ckfinder/files/74680678573.pdfIn PDF document text
- http://kesherisrael.com/uploadEditor/files/85700020752.pdfIn PDF document text
- http://skuplaptop.pl/wp-content/plugins/formcraft/file-upload/server/content/files/161355a8d29a80---81550054919.pdfIn PDF document text
- http://swiftnb.com/ckfinder/userfiles/files/ridufeperaregi.pdfIn PDF document text
- http://dichvu12h.net/userfiles/file/34476823176.pdfIn PDF document text
- http://aallergy.friend-match.com/upload/files/44430691924.pdfIn PDF document text
- http://print-resource.co.uk/ckfinder/userfiles/files/boludekinidipawimuse.pdfIn PDF document text
- https://realxenon.ru/uploads/files/69484220763.pdfIn PDF document text
- http://www.sushmitamukherjee.com/fckimages/file/falevobekaguligebexifeli.pdfIn PDF document text
- http://22vek-omsk.ru/fck_editor_files/files/kiboxetelavipizak.pdfIn PDF document text
- http://utcsp2.rustyramone.com/uploads/files/juvinikowu.pdfIn PDF document text
- http://stphilomenaonline.org/userfiles/file/nalugefurewogikidukok.pdfIn PDF document text
- http://agataklimowska.pl/userfiles/file/70361300728.pdfIn PDF document text
- http://polyalpan.hu/_user/file/nuvopelepijej.pdfIn PDF document text
- http://architettomontanino.eu/userfiles/files/56331467079.pdfIn PDF document text
- https://casasholidays.com/scgtest/team-explore/uploads/files/54635057404.pdfIn PDF document text
- http://pamatudarbai.lt/ckfinder/userfiles/files/55510642355.pdfIn PDF document text
- http://morethancars.nl/uploads/edytor/file/jebut.pdfIn PDF document text
- https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=surya+namaskara+slokamPDF 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_off0000e9d7.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xE9D7	17320 bytes
SHA-256: `aab78ef0f26f8afb79644b67b63c05dc7d4071c9d910d8c84e2476c938231fdf`
`font_01_sfnt_off00011687.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x11687	10328 bytes
SHA-256: `2b71cb338287928ee5e11159f3cd9467e4ff1091c8a000e79b09565aeb715785`
`font_02_sfnt_off00012dd2.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x12DD2	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`

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