PDF malware analysis — malicious · 23f75dbc66e4f0e7

MALICIOUS

PDF

77.5 KB Created: 2021-09-18 04:37:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31

MD5: 6b06cf012127ba42b5530569d9aedd60 SHA-1: 7a1ebb0470d7a29cecb64efcf8a57fc6d0bb87e7 SHA-256: 23f75dbc66e4f0e7130a09f9a5be9e58471070a24c9008f4db5cf4efbcc796f4

126 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

The PDF was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains a large number of embedded URLs, many of which point to disposable domains, indicating a link farm designed to redirect users. The presence of PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports this, suggesting the PDF is used to distribute links to potentially malicious content.

Machine Learning

Nyx PDF Classifier malicious score 0.9919

Heuristics 5

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.
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://www.leadercaravans.com.au/application/third_party/ckfinder/userfiles/files/24224638139.pdf In PDF document text
- http://exihomes.com/userfiles/files/73458169886.pdfIn PDF document text
- http://sheilahancock.net/blogfck/file/kanoboneboworovuwe.pdfIn PDF document text
- https://satellietgroep.nl/userfiles/files/5337787336.pdfIn PDF document text
- https://bipalisdemo.dashindonesia.com/userfiles/files/kulibo.pdfIn PDF document text
- http://mosme.org/uploadfile/files/32008160760.pdfIn PDF document text
- https://quatden.vn/webroot/img/files/35154393216.pdfIn PDF document text
- https://adsbudget.net/userfiles/file/56477526772.pdfIn PDF document text
- http://valsadindustries.com/userfiles/file/69960185657.pdfIn PDF document text
- https://atrax.eu/userfiles/file/40802287455.pdfIn PDF document text
- http://manpukuorder.com/uploads/files/tumorisojagoxuj.pdfIn PDF document text
- http://www.hgekc.com/media/userfiles/file/lozupusipilumosi.pdfIn PDF document text
- https://al-farh-iq.com/upload/userfiles/file/90262231553.pdfIn PDF document text
- https://www.brunosistemi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140edba0ffc3---fezekaf.pdfIn PDF document text
- https://seroinstitute.com/wp-content/plugins/super-forms/uploads/php/files/0da3d27415ec47d6b837cc1c520677cb/82698897538.pdfIn PDF document text
- https://www.groupe-coelho.fr/ckfinder/userfiles/files/xefiremelopapu.pdfIn PDF document text
- http://solmoda.it/userfiles/files/papule.pdfIn PDF document text
- http://thailaundry.com/imgUpload/files/wejofiboxanijova.pdfIn PDF document text
- https://jamuiboe.com/webroot/upload_media/gadibigasotot.pdfIn PDF document text
- https://kottayammedicalcollege.org/CMS/ckfinder/userfiles/files/vijixorum.pdfIn PDF document text
- http://www.ufolep-69.com/contenus/files/terilodavezivo.pdfIn PDF document text
- http://aircond.md/upload_fck/file/7154849854.pdfIn PDF document text
- http://weingut-suppan.at/files/64905955900.pdfIn PDF document text
- https://chingchia.com/uploads/files/202109090946194414.pdfIn PDF document text
- https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=dirt+4+apkPDF 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 4

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`font_00_sfnt_off0000bec9.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xBEC9	9848 bytes
SHA-256: `f9f805a77ffc1f03e1c5e264a001c28d3e4c2d35d1c473bbafea82dc2c6ae28d`
`font_01_sfnt_off0000d497.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xD497	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_02_sfnt_off0000eca4.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xECA4	1820 bytes
SHA-256: `ef4c56b83544acc0eae329b123dcb13384a4443b8ee25b6b011fcec9f25c534c`
`font_03_sfnt_off0000f52a.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xF52A	20124 bytes
SHA-256: `b05bfbc0872ad58c23c26acc68da37020323d49492bb25b0012972804af87234`

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