PDF malware analysis — malicious · 9df8b58e47076be8

MALICIOUS

PDF

82.1 KB Created: 2021-09-19 19:46:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24

MD5: 61faaf1f233d36556263bef184317bc5 SHA-1: 065d0913484aa4bed16f77fc5fd4f568c8014440 SHA-256: 9df8b58e47076be8b68a5f8a7c443139d17f5d5b4793f8401750b6c655d03058

134 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

The sample is a PDF file flagged by ClamAV as a phishing trojan and by an ML classifier as malicious. It contains embedded JavaScript and numerous external URIs, many of which point to link farms or disposable hosting, suggesting an attempt to redirect users to malicious sites. The presence of embedded JavaScript indicates potential for further malicious actions, such as downloading additional payloads or executing exploits.

Machine Learning

Nyx PDF Classifier malicious score 0.9955

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://laborke.ru/uplcv?utm_term=play+store+apps+not+downloading+on+wifi PDF link annotation
- http://mixmarketing.vn/upload/fck/file/mewazumuxev.pdfIn PDF document text
- http://archgeo-leszno.pl/uploads/userfiles/files/sezekirivowun.pdfIn PDF document text
- https://nbcmedia.vn/ckfinder/userfiles/files/rozitaliba.pdfIn PDF document text
- http://gotoippc.com/ckfinder/userfiles/files/negevunivovile.pdfIn PDF document text
- https://visualmotion.nl/uploads/file/jubemifupobanunet.pdfIn PDF document text
- http://security-m.jp/tool/images/file/58076285690.pdfIn PDF document text
- http://blccy.com/userfiles/files/58973861467.pdfIn PDF document text
- http://oecschool.com/userfiles/file/78686804555.pdfIn PDF document text
- https://budgetparking.ca/admin/uploads/file/76490836831.pdfIn PDF document text
- http://due.pt/js/ckfinder/userfiles/files/77553960911.pdfIn PDF document text
- http://condominiobrisasdelnorte.com/userfiles/file/xexavivumomero.pdfIn PDF document text
- https://regaluxiluminacion.com/uploads/assets/file/burujexoxegomogopubonexet.pdfIn PDF document text
- http://mail-business.ru/uploads/file/97119427089.pdfIn PDF document text
- http://groupementpecheduloir.com/ckfinder/userfiles/files/larigirukaronatux.pdfIn PDF document text
- http://king-tableware.com/uploads/files/202109041346078523.pdfIn PDF document text
- https://polandpools.com/contents/files/devoruwo.pdfIn PDF document text
- http://alphanaturehk.com/userfiles/file/jigigufurebokej.pdfIn PDF document text
- http://kovospm.cz/fotky/file/18664508949.pdfIn PDF document text
- http://resortcrimea.com/ckfinder/userfiles/files/dukosofopadijuk.pdfIn PDF document text
- https://edenestates.com/ckfinder/userfiles/files/jubuririv.pdfIn PDF document text
- https://www.davinci.dk/wp-content/plugins/formcraft/file-upload/server/content/files/161310d1153fb7---40908424417.pdfIn PDF document text
- https://lmcmanager.com/ckfinder/userfiles/files/bubitotovoritivarer.pdfIn PDF document text
- http://sosonomo.com/ckfinder/userfiles/files/9410775939.pdfIn PDF document text
- https://stancijanegrin.com/UserFiles/files/vojovolexogukajemisomipev.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_off0000db79.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xDB79	10876 bytes
SHA-256: `c1cd5478ae8704b8482fbd83aa26602ee5f09c260de486e82ad1e14e0ed504a9`
`font_01_sfnt_off0000f4a3.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xF4A3	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_02_sfnt_off00010cb5.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x10CB5	17656 bytes
SHA-256: `0e5da67b34b329c0d92455939498aca3868c0ac5caf460a9a14ec65ba227b143`

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