PDF malware analysis — malicious · 472fb015c0b2a1a9

MALICIOUS

PDF

86.7 KB Created: 2021-09-12 15:12:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16

MD5: 237b963c727afc37b7423fbc458e8324 SHA-1: 324dc23eacca6f8f337a0989f29bb1e38c55514a SHA-256: 472fb015c0b2a1a980f435152d5ebb0232685981630fc163ed0fa1d556e0a6a0

134 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

The sample was detected as a malicious PDF by ClamAV and an ML classifier. It contains embedded JavaScript, which is often used to download and execute additional malicious payloads. The PDF also functions as a link farm, directing users to numerous external PDF files hosted on various domains, suggesting a phishing or malware distribution scheme.

Machine Learning

Nyx PDF Classifier malicious score 0.9974

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://istanbulballoons.com/ckfinder/userfiles/files/lalorila.pdf In PDF document text
- http://studiomalpocher.it/userfiles/files/78487376050.pdfIn PDF document text
- http://chronocertif.com/userfiles/file/zozuzosazijabimaz.pdfIn PDF document text
- http://splhardware.com/UploadFile/file/2021090405295973499.pdfIn PDF document text
- https://ocw.tw/uploads/files/37649305633.pdfIn PDF document text
- http://www.me.ntou.edu.tw/ckfinder/userfiles/files/20210911_013108.pdfIn PDF document text
- http://akekaluck.com/ckfinder/userfiles/files/10934163073.pdfIn PDF document text
- http://www.hro.ait.ac.th/js/ckfinder/userfiles/files/gujidizajoginuwikasa.pdfIn PDF document text
- http://www.thegrcinstitute.org/app/webroot/js/ckfinder/userfiles/files/taromaporovujezixoxo.pdfIn PDF document text
- http://poney-club-romilly-aigre28.fr/userfiles/file/78077743493.pdfIn PDF document text
- https://stcatherine.ac.ug/wp-content/plugins/formcraft/file-upload/server/content/files/16137446b2f73b---11857521080.pdfIn PDF document text
- http://peknanevesta.sk/media/file/xawopox.pdfIn PDF document text
- https://multimetrics.com/ckfinder/userfiles/files/47903298257.pdfIn PDF document text
- https://vinniescustoms.com/userfiles/files/49587956440.pdfIn PDF document text
- http://barahi.com/assets/userfiles/files/lelevekukegefavevota.pdfIn PDF document text
- https://dermo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b05a77564f---76559066478.pdfIn PDF document text
- http://erictex.com/ufiles/files/69918405685.pdfIn PDF document text
- http://doradcyprawni.com/images/pliki/rijetigamovativegosutef.pdfIn PDF document text
- http://ducthoaudio.com/upload/files/40611909729.pdfIn PDF document text
- http://jmlukanich.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/ronibajikazelaba.pdfIn PDF document text
- https://fcksa.com/ckfinder/userfiles/files/23183652355.pdfIn PDF document text
- http://eatatrudy.com/uploads/files/45647016002.pdfIn PDF document text
- http://alnadaoil.com/userfiles/file/19189617504.pdfIn PDF document text
- https://windfreeklima.com/upload/ckfinder/files/25103553959.pdfIn PDF document text
- https://dewalt-naradi.cz/media/upload/editor/file/zuserejekazinoxemij.pdfIn PDF document text
- https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=android+studio+schedule+appPDF 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_off0000ede6.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xEDE6	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_01_sfnt_off000105f8.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x105F8	18044 bytes
SHA-256: `d96f63f36b2df8475a8dc4d93670335a5853b79ace38d1a783420dbfccd7ced8`
`font_02_sfnt_off00013474.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x13474	10692 bytes
SHA-256: `067072111a329dabf86014f842bd871da0f896ef6affe4cd2ac06ac7d6df5aa9`

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