PDF malware analysis — malicious · 33916b4fc1cc9e1f

MALICIOUS

PDF

77.0 KB Created: 2021-09-10 23:30:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23

MD5: 97b103dc64cf33d5a9167458a41cca0e SHA-1: 6983a64dc3095c6e87c630e2501babe99366f3e1 SHA-256: 33916b4fc1cc9e1f81cf1bec2196a2f2c14bd871e70d0c78b1a57ca4fe23f357

134 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

The sample is a PDF file flagged as malicious by ClamAV and an ML classifier, containing embedded JavaScript. The PDF also functions as a link farm, pointing to numerous external URLs, many of which are hosted on potentially disposable domains. This combination strongly suggests the document is intended to lure users to malicious sites, likely for phishing or to download further malware.

Machine Learning

Nyx PDF Classifier malicious score 0.9973

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://www.ecvbrass.ch/user/web/file/gatimilapafokiri.pdf In PDF document text
- http://doingthing.com/downloads/blog/geust/files/vitasovamuganadifof.pdfIn PDF document text
- https://slotpt2.com/contents/files/ragokerevubevev.pdfIn PDF document text
- http://emotionpicturesfestival.gr/userfiles/file/naberatapoxutuvaba.pdfIn PDF document text
- https://infotechb2blite.com/bot/ckfinder/uf/files/muzexodexojijiv.pdfIn PDF document text
- http://ristorantebiscione.com/userfiles/files/30574765188.pdfIn PDF document text
- http://delfosventures.net/userfiles/files/kugibuvuzawujusunulixoma.pdfIn PDF document text
- http://sabancilojistik.com/userfiles/file/68387651785.pdfIn PDF document text
- http://vucert.vn/uploads/files/fedikegefejewapipowiwugup.pdfIn PDF document text
- http://banglenhospital.com/UserFiles/File/paniz.pdfIn PDF document text
- http://luckyassessoria.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16139711920de5---32987334070.pdfIn PDF document text
- https://dichvuketoanvn.org/uploads/files/45637292348.pdfIn PDF document text
- https://www.idd.no/ckfinder/userfiles/files/74833832089.pdfIn PDF document text
- https://aviseco.ro/userfiles/file/98131147052.pdfIn PDF document text
- https://sunnyvale.com/wysiwygfiles/file/fusegovikopaxudaxevenesez.pdfIn PDF document text
- https://elmawadah.com/userfiles/file/takodufonozomumiroko.pdfIn PDF document text
- http://ibsdhc.hpds.work/ecdemo/web/js/ckfinder/files/files/15285820401.pdfIn PDF document text
- http://zulassungsdienst4you.de/bilder/file/sirumuvesakalepisen.pdfIn PDF document text
- http://arndt-fahrschule.de/userfiles/file/43828064782.pdfIn PDF document text
- https://oilbasaro.com/web/images/ckfinder/files/20210831233244.pdfIn PDF document text
- http://floral-design-lindgens.de/userfiles/file/dexekipis.pdfIn PDF document text
- http://articolo17.it/siti/usr/foto/files/jujakakupukegedaned.pdfIn PDF document text
- https://www.peltonfell.org.uk/ckfinder/userfiles/files/mubetuluxar.pdfIn PDF document text
- http://alarcon-v.com/editor_upload_image/file/68078551054.pdfIn PDF document text
- https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=add+interstitial+ads+androidPDF 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_off0000ca1d.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xCA1D	17360 bytes
SHA-256: `3b520ca47acb817acff49ac13277a62a8b9638f4ba82365cda17acf6d2f06839`
`font_01_sfnt_off0000f74f.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xF74F	10220 bytes
SHA-256: `7a78847d4037e84886a701981669d08d85dbe04c553552040736a3f2fb025b74`
`font_02_sfnt_off00010e5b.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x10E5B	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`

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