PDF malware analysis — malicious · 5473918078d5f27f

MALICIOUS

PDF

71.7 KB Created: 2021-09-09 05:59:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27

MD5: 3f1e49ebcc25be829a3f323a281eba3c SHA-1: f6aa3f7598d592e41682fc6a27d39883566fe6c6 SHA-256: 5473918078d5f27f2001885373cf0f069f2343039a2c3db0ab4dfe8ae42da6e6

134 Risk Score

Malware Insights

MITRE ATT&CK

T1059.007 JavaScript T1566.001 Spearphishing Attachment

The sample is a PDF file flagged as malicious by ML classifiers and ClamAV. It contains embedded JavaScript, which is often used to download further malicious payloads or redirect users to malicious sites. The presence of numerous external links, many pointing to disposable domains, suggests a link farm or phishing attempt. The ML classifier output of 0.997769 indicates a high likelihood of malicious intent.

Machine Learning

Nyx PDF Classifier malicious score 0.9978

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://yejida.com/userfiles/file/52335728035.pdf In PDF document text
- http://mikomisushiwc.com/uploads/files/sonolibugubixozogunezo.pdfIn PDF document text
- http://siciny.pl/userfiles/file/xonufijuwefog.pdfIn PDF document text
- https://egokituz.eus/files/galeria/files/rezozajakojexupusa.pdfIn PDF document text
- http://kbidc.kr/upload/editor/file/1630863549.pdfIn PDF document text
- https://atvatextile.com/upload/ckfinder/files/wevatapidodirefipazivogir.pdfIn PDF document text
- https://globalcareerclub.com/FCKeditor/userfiles/file/dikixavoron.pdfIn PDF document text
- http://sabaparsian.com/ckeditor/files/files/76914430505.pdfIn PDF document text
- http://bonezi.morefriendship.com/upload/files/15588413375.pdfIn PDF document text
- http://parcroyale.hk/userfiles/pefunowetuj.pdfIn PDF document text
- http://english-island.pl/wp-content/plugins/super-forms/uploads/php/files/idvfottlgg90vmcj8ce37h1iv1/zemufapasalesufupusogiwo.pdfIn PDF document text
- https://habibitoursegypt.com/ckfinder/userfiles/files/suvusuraripojivanegej.pdfIn PDF document text
- http://avon-bratislava.sk/files/files/fexonesubuxuluginoni.pdfIn PDF document text
- https://dermatologie-francophone.com/userfiles/file/75440029965.pdfIn PDF document text
- https://dycmc.com/DATA/upload/files/202109091024102512.pdfIn PDF document text
- http://sanarina-coaching.de/ckfinder/userfiles/files/4888227670.pdfIn PDF document text
- https://reaga.net/js/ckfinder/userfiles/files/66353146756.pdfIn PDF document text
- https://fenixfalt.com/userfiles/file/lanozakapepomudaxikisi.pdfIn PDF document text
- http://stellarp.com/userfiles/files/wedejegasefuvid.pdfIn PDF document text
- https://lanhcongnghiepthinhphat.com/upload/files/22230894872.pdfIn PDF document text
- http://statsale.com/data/upload/ck/files/68943638064.pdfIn PDF document text
- http://spartaksedlec.cz/spartaksedlec/userfiles/file/rumurof.pdfIn PDF document text
- https://www.icicle-mountaineering.ltd.uk/ckfinder/userfiles/files/guwerixin.pdfIn PDF document text
- https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=answered+prayers+pdfPDF 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_off0000b57f.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xB57F	16996 bytes
SHA-256: `4dda760c2e92f2a2464b0258b9deeed526dd17bbf8162eadf4de43397570d584`
`font_01_sfnt_off0000e197.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xE197	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_02_sfnt_off0000f9ae.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xF9AE	10316 bytes
SHA-256: `ea70d70fb43a180120dc16c134ff850c437e5c65073d44cfc9cf5931b0a2068c`

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