PDF malware analysis — malicious · aaa80c739b850a97

MALICIOUS

PDF

76.1 KB Created: 2021-09-09 14:22:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25

MD5: 221827342de9ac30007cb3c7408eff7f SHA-1: 910f229f64d7c7466f7c1bcb6d3a094350b9efed SHA-256: aaa80c739b850a978f71f5bbe0fd4cc27ed5464d555d4861539417551d2a25f1

134 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a large number of external URIs, many of which are part of a link farm on disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The embedded JavaScript is a common technique for exploiting PDF vulnerabilities or redirecting users.

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 https://crewmak.ru/uplcv?utm_term=eliot+goldfinger+human+anatomy+for+artists+pdf PDF link annotation
- http://a2itsolutions.com/chop/multimedia/userfiles/file/97131896362.pdfIn PDF document text
- https://bistakalikotenetwork.com/userfiles/file/41072558924.pdfIn PDF document text
- http://exima.kr/userData/board/file/limoxinapifedozow.pdfIn PDF document text
- http://xn--nellieskche-0hb.de/userfiles/file/38521837853.pdfIn PDF document text
- http://ballmillfactory.com/d/files/divamuvozuremetu.pdfIn PDF document text
- http://foto-recepty.sk/images/fotky/fixilanitojafija.pdfIn PDF document text
- http://bjqyms.com/filespath/files/20210901160147.pdfIn PDF document text
- https://infotechloyalty.com/bot/ckfinder/uf/files/9955537478.pdfIn PDF document text
- https://arichaindia.com/userfiles/file/67765121258.pdfIn PDF document text
- http://louisamerino.com/userfiles/file/30740236948.pdfIn PDF document text
- http://objets.immoweiss.lu/userfiles/files/lebutis.pdfIn PDF document text
- http://print-printonline.com/ckfinder/userfiles/files/25801912496.pdfIn PDF document text
- http://www.sec-ollivier-associes.fr/www/upload/file/75333595923.pdfIn PDF document text
- http://polishingmarblefloor.it/userfiles/files/2065940279.pdfIn PDF document text
- https://jin-ji.com/upload/files/68909458995.pdfIn PDF document text
- https://mariapolis.es/ckfinder/userfiles/files/83950965966.pdfIn PDF document text
- https://zhbiotech.com/CKEdit/upload/files/13073206700.pdfIn PDF document text
- http://zeguvietnam.com/uploads/ckfinder/files/41396616511.pdfIn PDF document text
- http://toyotaprius-custom.com/js/upload/files/83906119892.pdfIn PDF document text
- http://www.perchegouet.com/ckfinder/userfiles/files/vokukifufu.pdfIn PDF document text
- http://www.petersonassoc.com/emailimages/file/70735126919.pdfIn PDF document text
- http://sobinco.cz/ckfinder/userfiles/files/37412152164.pdfIn PDF document text
- https://aczv.fr/userfiles/file/30658110253.pdfIn PDF document text
- http://strandedtattoo.info/file/lipuzazoxetolaxujo.pdfIn PDF document text
- 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_off0000c7ed.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xC7ED	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_01_sfnt_off0000dfff.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xDFFF	15984 bytes
SHA-256: `f654b09024512ebc74448e316fe7c6410a5140cde5ca1825fc634eb81c3e9609`
`font_02_sfnt_off0001089c.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x1089C	11144 bytes
SHA-256: `8349d44d6823ec7baa95ac1138a3014aac848bdb01b9e4e9228e2315bb5baa8b`

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