PDF malware analysis — malicious · 77b5f0d555993574

MALICIOUS

PDF

86.2 KB Created: 2021-09-09 05:11:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11

MD5: fb5f7c7a10bf7a22341b3faba654149d SHA-1: d7dad142e1dac7de09da685ace91f9a69dff015a SHA-256: 77b5f0d5559935748588f3cef57e2ef45671149d9881d24c8bed98ea01b8f71d

134 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, with a critical detection score. It contains embedded JavaScript and numerous external URIs, many of which point to disposable domains and are likely used for phishing or to host further malicious content. The presence of embedded JavaScript suggests an attempt to execute code within the user's browser or PDF viewer.

Machine Learning

Nyx PDF Classifier malicious score 0.9976

Heuristics 6

ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
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://risme.vn/files/depukasenoxalevajumo.pdf In PDF document text
- http://benetworkingpro.com/ckfinder/userfiles/files/zirukiwenawewigikowotoxa.pdfIn PDF document text
- http://keyflounge.nl/userfiles/file/bizukowifudejewodubi.pdfIn PDF document text
- https://serwisnawigacji.pl/userfiles/file/pibujasume.pdfIn PDF document text
- https://svenjakretschmer.com/ckfinder/userfiles/files/gelizukojem.pdfIn PDF document text
- http://beerskiboot.de/img/upload/file/jiwavokinoxi.pdfIn PDF document text
- https://ifacemount.com/wp-content/plugins/super-forms/uploads/php/files/s4rrngh18gommlbrou4r1efanv/45603417153.pdfIn PDF document text
- http://gostium.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613365a035f7b---mijipurewefemo.pdfIn PDF document text
- https://ichibaninfotech.com/ckfinder/userfiles/files/derani.pdfIn PDF document text
- https://buffinvestment.com/upload/ckfinder/files/jasoneruwaxetugig.pdfIn PDF document text
- https://navoloki.mebel18.com/uploads/files/71422358109.pdfIn PDF document text
- https://venusnvs.com/userfiles/file/dodebafilomu.pdfIn PDF document text
- http://ourpreferred.com/userfiles/files/85880216442.pdfIn PDF document text
- https://whatproperty.ng/ckfinder/userfiles/files/zomipitogijimetejakogel.pdfIn PDF document text
- https://deltaguvenlik.net/userfiles/file/93731574162.pdfIn PDF document text
- https://www.asoriofrio.org/ckfinder/userfiles/files/sexofokomi.pdfIn PDF document text
- https://www.allduniv.ac.in/ckfinder/userfiles/files/17323422054.pdfIn PDF document text
- http://www.llmhospital.com/www/js/ckfinder/userfiles/files/lufedilereze.pdfIn PDF document text
- http://aodaibooking.com/FileData/ckfinder/files/20210906_8074450EC6F2AE71.pdfIn PDF document text
- http://contua.org/userfiles/file/pujazubugugudapiziwada.pdfIn PDF document text
- http://koreaseals.com/ckfinder/userfiles/files/46141451909.pdfIn PDF document text
- http://skmsm.com/userData/board/file/nezomapegodajopoti.pdfIn PDF document text
- http://tatagz.com/uploadfile/files/jegavukajezogijami.pdfIn PDF document text
- https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=top+games+in+india+for+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_off0000eeec.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xEEEC	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_01_sfnt_off000106fe.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x106FE	17024 bytes
SHA-256: `2af47b8efcfa4001509fc9132c6dfbc34c8ff02425897f554c5bf38ff3587cff`
`font_02_sfnt_off000132df.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x132DF	10660 bytes
SHA-256: `b2b4373eecb752a3aa86f990cc47d04e6f0e6ca348d9218497cd2b9e5a6f6868`

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