PDF malware analysis — malicious · a4f9f6e7ee4038d4

MALICIOUS

PDF

92.9 KB Created: 2021-09-12 04:34:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12

MD5: 679bf1186576d496cf9040e4df793860 SHA-1: 12f9a3416530729fe194dc971f0493b04b77758c SHA-256: a4f9f6e7ee4038d47e52339fb37e9bc2f8a51bde32cf73e848c7e46e06d0c070

134 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

The sample was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. It contains embedded JavaScript, which is often used to execute malicious code or redirect users. The PDF also hosts a large number of external links, many pointing to PDF files on various domains, suggesting a link farm or redirection mechanism designed to obscure the ultimate destination.

Machine Learning

Nyx PDF Classifier malicious score 0.9935

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://zssadkowice.pl/pliki/datowa.pdf In PDF document text
- http://idolyokocho.com/js/ckfinder/userfiles/files/dusovademakupab.pdfIn PDF document text
- http://jsjxh.org/filespath/files/20210901232530.pdfIn PDF document text
- http://bfr-bialapodlaska.pl/userfiles/file/88963068890.pdfIn PDF document text
- http://home-hj.com/up_photo/file/veguvolifadowe.pdfIn PDF document text
- https://metroguards.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1613d31a10a68d---mevawimu.pdfIn PDF document text
- http://brenna-ski.pl/userfiles/file/2295667647.pdfIn PDF document text
- https://classoft.ro/userfiles/file/rabukopi.pdfIn PDF document text
- https://vico-domrep.com/ckfinder/userfiles/files/98076946943.pdfIn PDF document text
- https://h16hr15k-h19hr37urn.com/contents/files/25880205789.pdfIn PDF document text
- http://lesen-und-schenken.de/userfiles/files/burexetegudikokowubugo.pdfIn PDF document text
- http://marathon-gexin.com/Uploadfiles/files/95435759448.pdfIn PDF document text
- http://hud101.vn/webroot/img/posts/files/zuvotenowixaxixawamosof.pdfIn PDF document text
- http://www.emploi.nat.tn/ckeditor/ckfinder/userfiles/files/terikadimuvojoza.pdfIn PDF document text
- http://agriturismolescuderie.eu/userfiles/files/18115718667.pdfIn PDF document text
- http://fcraregistration.com/UploadedData/file/14068768023.pdfIn PDF document text
- https://mimpiindahsatu.com/contents/files/bikixojivevubokenagabetap.pdfIn PDF document text
- http://www.kliningstroy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1613d23a256470---lekavuludibibozerabopo.pdfIn PDF document text
- http://descanso.verareyes.com/ckfinder/userfiles/files/wonaxazativumamewajedo.pdfIn PDF document text
- http://palazzodiaz.com/userfiles/files/jemewuzojinunakegu.pdfIn PDF document text
- http://fpempresa.cen.es/userfiles/files/dobagajiworowivanagemi.pdfIn PDF document text
- http://webs123.com/userfiles/file/68472443080.pdfIn PDF document text
- https://www.thic.net/plugin/ce1/ckfinder/userfiles/files/sazajifodoxafamap.pdfIn PDF document text
- http://17njl.com/userfiles/files/xadodudivazivefeduboke.pdfIn PDF document text
- https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=hobbs+and+shaw+full+movie+hdPDF 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_off00010038.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x10038	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_01_sfnt_off0001184a.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x1184A	20440 bytes
SHA-256: `7c0e6d7a4d7d7f420ca59d166b729774cc93ae8abd9492a1c5a3a84d106a5e06`
`font_02_sfnt_off00014d9d.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x14D9D	10804 bytes
SHA-256: `6c9187966773fa4e8905ad4ae432f0961b636615deabbba488f46a32526fdb6f`

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