PDF malware analysis — malicious · 420b45d51a723802

MALICIOUS

PDF

79.0 KB Created: 2021-09-23 02:04:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23

MD5: cecfd704a4d6ae4a1e0a96643ca1c05c SHA-1: 92d8fdd95918d2a3552b45910a2be3f0f0b88ecf SHA-256: 420b45d51a723802f58da34c320b7c5f189ae59b98de2b02a5faa8af48893d76

134 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, with heuristics indicating embedded JavaScript and numerous external URIs. The presence of embedded JavaScript suggests an attempt to execute malicious code within the PDF viewer. The high number of external links, many on disposable hosting, points towards a phishing or malware distribution campaign.

Machine Learning

Nyx PDF Classifier malicious score 0.9953

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://oniceh.ru/uplcv?utm_term=stick+war+789+apk PDF link annotation
- http://sunway.me/ROOT_PATHuploads/file/060550165431.pdfIn PDF document text
- http://rajskiewakacje.pl/userfiles/file/xovemilogibumi.pdfIn PDF document text
- http://www.platformliften.info/wp-content/plugins/formcraft/file-upload/server/content/files/161308d4538afa---taxugudowovotedozovud.pdfIn PDF document text
- http://adbrf.com/files/fckeditor/file/2080897221613b9148b851b.pdfIn PDF document text
- http://arenda-v-novosibirske.ru/ckfinder/userfiles/files/serumezuwuxudov.pdfIn PDF document text
- https://volgogradexpo.ru/ckfinder/userfiles/files/85167297474.pdfIn PDF document text
- https://guanlai.tw/uploads/files/202109130153071196.pdfIn PDF document text
- https://spitalmoldovanoua.ro/ckfinder/userfiles/files/tojufuperadasa.pdfIn PDF document text
- http://botaierpharm.com/upload/files/45975006732.pdfIn PDF document text
- https://fleuriste79.fr/ckfinder/userfiles/files/pifirovekemi.pdfIn PDF document text
- http://stroyindustry.com/userfiles/file/37450412517.pdfIn PDF document text
- http://gidromall.ru/img/uploads/file/85083840316.pdfIn PDF document text
- http://panhongbo.com/ckfinder/userfiles/site_eachfun_com/files/xovozenutemiku.pdfIn PDF document text
- https://thuhuonglacquer.com/uploads/news_file/9412901604.pdfIn PDF document text
- http://cctsw.net/whly/up_files/FCK/file/20210921_125607_186.pdfIn PDF document text
- http://dorapeyzaj.com/userfiles/file/34649685585.pdfIn PDF document text
- http://aapltd.net/userfiles/file/88061317675.pdfIn PDF document text
- https://krzczonowice.pl/gfx/file/sizomanivokusajekalapub.pdfIn PDF document text
- https://ixiu-23.com/uploads/files/202109050233216324.pdfIn PDF document text
- http://bio86.fr/userfiles/fichiers/zamumenubaji.pdfIn PDF document text
- https://minjar.mebel18.com/uploads/files/51146421572.pdfIn PDF document text
- http://inannamsao.com/uploads/files/pejidarinijuf.pdfIn PDF document text
- https://eminentland.com/admin/userfiles/files/fazimuxifotunisemokun.pdfIn PDF document text
- http://www.performhabitat.fr/bundles/astadmin/js/ckfinder/userfiles/files/73268684435.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_off0000d283.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xD283	10476 bytes
SHA-256: `d810eef7be547c39916b5024e3963d577559c8d036f2c060fd869f6e738f432b`
`font_01_sfnt_off0000ea9c.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xEA9C	16892 bytes
SHA-256: `8b01756f65f89a79590ea492ae5207fb2a113703fa50d29ced42ed180ca0f494`
`font_02_sfnt_off00011689.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x11689	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`

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